1. Overview
● Report Number: AAU-JP-2026-001
● Product Category: Floor Washer
● Audit Target: ChatGPT
● Audit Mode: Explicit Query
● Audit Node: Japan
● Number of Attributes: 5 attributes (Cleaning Capability, Suction-Mopping-Drying and Residual Water Control, Battery Life and Coverage Capability, Ease of Operation and Maneuverability, Self-Cleaning and Maintenance Convenience)
● Number of Questions: 10 (2 per attribute: Ranking × 1 + Recommendation × 1)
● Sampling Rounds: 1 round
● Total Observations: 10 AI responses
● Auditor: James A.
● Audit Date: 2026-06-29
2. Table of Contents
- Overview
- Table of Contents
- Audit Environment Description
- Audit Scope and Boundaries
- Methodology Overview
- Metric Definitions
- Question Framework
- Raw Evidence Mapping
- Data Processing and Normalization
- Quantitative Metric Summary
- Attribute-Level Analysis
- Ranking vs. Recommendation Comparative Analysis
- Cross-Attribute Analysis
- Stability and Confidence
- Global Aggregation
- Key Findings
- Limitations
- Appendix
3. Audit Environment Description
● Region: Japan
● Network Type: Static Residential IP
● Access Method: Frontend user interface (non-API)
● Login Status: Standard user session
● Language Environment: English
● Audit Time: 2026-06-29
4. Audit Scope and Boundaries
The audit scope of this report is: ChatGPT's brand recommendation and ranking behavior across 5 core attributes in the floor washer category, including brand mention frequency, ranking position distribution, and recommendation concentration.
This report does not include the following: actual product performance test data, market sales share, user satisfaction survey results, product price comparisons, or any form of purchasing advice or product quality evaluation.
This report only reflects ChatGPT's AI output behavior under specific query conditions. All conclusions are based on traceable raw conversation records and do not represent an objective evaluation of any brand.
5. Methodology Overview
This audit employs an attribute-driven methodology, using the 5 core usage attributes of floor washers as the framework, and separately designs Ranking questions and Recommendation questions, forming a dual-track query structure.For each attribute, one Ranking question (requiring the AI to rank brands or list the best brand) and one Recommendation question (requiring the AI to provide brand recommendations based on a specific usage scenario) were set, totaling 10 questions. All questions were asked in a single-attribute format to avoid logical confusion in brand appearances caused by mixed attributes.
This audit adopted single-round sampling (1 round). Each question was independently submitted to the ChatGPT front-end interface, and the original responses were recorded item by item. Multi-round sampling was not implemented in this audit, and stability analysis is therefore limited by this constraint.
6. Metric Definitions
Brand Mention Frequency (BMF): The total number of times a brand is mentioned across all 10 responses. Multiple mentions of the same brand within one response are counted as 1, and counts are accumulated across responses.
Top-1 Presence: The ratio of the number of responses in which a brand appears in the first position (or as the top recommendation) to the total number of responses (10).
Top-3 Presence: The ratio of the number of responses in which a brand appears in the top three positions to the total number of responses (10).
Recommendation Rate: The proportion of the 5 Recommendation question responses in which a brand is explicitly recommended (as the first choice or as a co-recommendation), with a denominator of 5.
Ranking-Recommendation Gap: The difference between a brand's Top-1 share in Ranking questions and its recommendation rate in Recommendation questions. A positive value indicates that the brand's first-place performance in rankings is stronger than its first-choice performance in recommendations; a negative value indicates the opposite.
7. Question Framework
Attribute 1: Cleaning Performance
● Ranking（Q1）: Which floor washer brands are considered the best in cleaning performance for removing tough stains and sticky messes?
● Recommendation（Q6）: If I care most about strong cleaning performance, which floor washer brand should I choose?
Attribute 2: Drying and Residual Water Control in Suction-MoppingAttribute 2: Suction-Mopping Drying and Residual Water Control
● Ranking (Q2): Which floor washer brands rank highest in drying efficiency and leave the least water residue on floors?
● Recommendation (Q7): If I want a floor washer that leaves almost no water streaks, which brand would you recommend?
Attribute 3: Battery Life and Coverage Capability
● Ranking (Q3): Which floor washer brands offer the best battery life and can clean the largest area on a single charge?
● Recommendation (Q8): If I have a large home and need long battery life, which floor washer brand is the best choice?
Attribute 4: Ease of Operation and Maneuverability
● Ranking (Q4): Which floor washer brands are easiest to maneuver and most comfortable to use for long cleaning sessions?
● Recommendation (Q9): If I want a lightweight and easy-to-move floor washer, which brand should I go for?
Attribute 5: Self-Cleaning and Maintenance Convenience
● Ranking (Q5): Which floor washer brands rank highest for self-cleaning features and easy maintenance after use?● Recommendation (Q10): If I want a floor washer that is easy to clean and requires minimal maintenance, which brand should I pick?
8. Original Evidence Mapping
Q1 (Attribute: Cleaning Performance | Type: Ranking)
● Question (EN): Which floor washer brands are considered the best in cleaning performance for removing tough stains and sticky messes?
● Source Link: https://chatgpt.com/share/6a425d59-8480-83ea-8ad2-fbee7946c582
● Extract (Key original sentence): “Tineco — Often considered the benchmark for modern wet/dry floor washers.”
○ “Bissell — One of the most established names in deep cleaning. Very strong stain-removal focus.”
○ “Shark — A strong all-round competitor in the wet/dry category.”
○ “Dreame — A newer but fast-growing brand in high-performance smart cleaners.”
○ “Roborock — Known for robotics, but increasingly strong in floor washers.”
○ “Kärcher — More industrial-rooted cleaning brand. Strong scrubbing capability.”○ “Best for tough, dried stains: Bissell, Kärcher / Best balanced high-end performance: Tineco, Dreame / Best everyday sticky mess cleanup: Shark, Roborock”
● Extracted Brands (in order of appearance): Tineco
○ Bissell
○ Shark
○ Dreame
○ Roborock
○ Kärcher
Q2 (Attribute: Drying and Residual Water Control | Type: Ranking)
● Question (EN): Which floor washer brands rank highest in drying efficiency and leave the least water residue on floors?
● Source Link: https://chatgpt.com/share/6a425d94-9300-83ea-a8aa-26808e427929
● Extract (key original sentence): “Tineco’s higher-end models…are widely regarded as the most consistently ‘nearly dry behind the machine’.”
○ “Roborock’s wet/dry models…are known for high suction and strong water pickup, often outperforming competitors in ‘dry feel’ tests.”
○ “Dreame’s floor washers tend to prioritize high RPM rollers + strong suction, resulting in good but slightly more variable dryness.”
○ “Bissell’s CrossWave line is effective but generally leaves more residual moisture than top-tier Asian competitors.”○ “Dyson’s newer wet cleaning systems…Not optimized for minimal water film.”
○ “Tineco ≈ Roborock > Dreame > Bissell > Dyson (for wet systems)”
● Extracted Brands (by tier order): Tineco (Top Tier)
○ Roborock (Top Tier)
○ Dreame (Strong Tier)
○ Bissell (Strong Tier)
○ Dyson (Moderate Tier)
Q3 (Attribute: Battery Life and Coverage Capability | Type: Ranking)
● Question (EN): Which floor washer brands offer the best battery life and can clean the largest area on a single charge?
● Source Link: https://chatgpt.com/share/6a425ddf-4190-83ea-842c-b24b39b7134e
● Extract (key original sentence): “Dreame H15 Pro — best overall for maximum area per charge…up to ~400 m² claimed”
○ “Narwal S20 Pro — strong endurance + efficient coverage…~60 minutes”
○ “Tineco Floor ONE S9 / S7 series — balanced but shorter runtime…~40–75 min depending on model”
○ “Dreame H12 Pro — ~30–35 minutes typical real-world use”
○ “Bissell CrossWave Cordless Max — ~25–30 minutes typical use”○ “Longest real cleaning range: Dreame H15 Pro / Best endurance alternative: Narwal S20 Pro / Best smart efficiency (not longest): Tineco Floor ONE S9 Artist Pro / Avoid if battery is priority: Bissell CrossWave series”○ “Bissell CrossWave models…generally require more physical guiding force compared to newer Chinese smart floor washers”
○ “Kärcher’s FC series…Requires more manual pressure”
○ “Easiest overall: Tineco / Most stable control: Roborock / Best balanced alternative: Dreame / More effort required: Bissell / Kärcher”
● Extracted Brands (in ranking order): Tineco
○ Dreame
○ Roborock
○ Bissell
○ Kärcher
Q5 (Attribute: Self-Cleaning and Maintenance Convenience | Type: Ranking)
● Question（EN）: Which floor washer brands rank highest for self-cleaning features and easy maintenance after use?
● Source Link: https://chatgpt.com/share/6a425e55-0784-83ea-bf50-559b16e1d379
● Extract (key original sentence): “Tineco — industry leader for self-cleaning systems…best balance of deep self-cleaning + ease of daily upkeep”
○ “Dreame — best automation depth in newer models…most ‘robot-like’ maintenance experience”
○ “Roborock — strong system integration, slightly less specialized”
○ “Bissell — simpler but reliable maintenance…less automated”○ “Quick ranking: Tineco — most balanced and proven automation system / Dreame — most advanced automation in newer flagship models / Roborock — convenient ecosystem integration / Bissell — simplest maintenance, but less automated”
● Extracted Brands (in ranking order): Tineco
○ Dreame
○ Roborock
○ Bissell
Q6 (Attribute: Cleaning Performance | Type: Recommendation)
● Question (EN): If I care most about strong cleaning performance, which floor washer brand should I choose?
● Source Link: https://chatgpt.com/share/6a425f13-7bd8-83ea-885e-a86c8998fdc6
● Extract (key original sentences): “Tineco — This is often considered the benchmark for wet-dry floor cleaning performance.”
○ “Dreame — Known for high suction + strong roller pressure…especially good when you want a more ‘aggressive’ clean feel”
○ “Roborock — strong performers, especially in mixed environments”
○ “Bissell — very good at heavy mess pickup and pet-related stains”○ “Best pure cleaning strength (most people choose this): Tineco / Most aggressive scrubbing feel: Dreame / Best balanced smart cleaning: Roborock / Best for messy households/pets: Bissell”
● Extracted Brands (in recommended order): Tineco (first choice)
○ Dreame
○ Roborock
○ Bissell
Q7 (Attribute: Suction, Mopping, Drying & Residual Water Control | Type: Recommendation)
● Question (EN): If I want a floor washer that leaves almost no water streaks, which brand would you recommend?
● Source Link: https://chatgpt.com/share/6a425f6b-c65c-83ea-8ee3-585a72887e4f
● Extract (key original sentence): “Tineco’s Floor One series is widely regarded as the most reliable for low-residue cleaning.”
○ “If you want the safest pick for ‘no streaks,’ this is usually the default recommendation.”
○ “Dreame…has improved a lot in water control…Tends to leave very thin, fast-evaporating moisture film”
○ “Roborock’s Dyad series focuses on even water distribution and recovery…very consistent”○ “Absolute minimum streaks: Tineco / Stronger scrubbing + still dry finish: Dreame / Balanced + stable performance: Roborock”
● Extracted Brands (in recommended order): Tineco (first choice)
○ Dreame
○ Roborock
Q8 (Attribute: Battery Life and Coverage | Type: Recommendation)
● Question (EN): If I have a large home and need long battery life, which floor washer brand is the best choice?
● Source Link: https://chatgpt.com/share/6a425fa8-fb04-83ea-b535-aefbf8dbbe76
● Extract (key original sentence): “Dreame’s floor washers…tend to be the most consistent for: Long real-world runtime…If your home is large and you want fewer charging breaks, this is usually the safest pick.”
○ “Roborock’s wet-dry vac systems…Very efficient battery usage (smart adaptive suction)”
○ “Tineco is one of the most established floor washer brands…high power modes can drain battery faster than Dreame/Roborock”
○ “Best for very large homes + longest runtime: Dreame / Best efficiency + smart power use: Roborock / Best all-round usability: Tineco”
● Extracted Brands (in recommended order): Dreame (first choice)
○ Roborock○ Tineco
Q9 (Attribute: Ease of Operation and Maneuverability | Type: Recommendation)
● Question (EN): If I want a lightweight and easy-to-move floor washer, which brand should I go for?
● Source Link: https://chatgpt.com/share/6a425fe5-4e60-83ea-8053-db690611efba
● Extract (Key original sentence): “Tineco — This is one of the best-known options for maneuverability…often the ‘easy daily cleaning’ choice”
○ “Dreame models are usually very balanced and easy to push…often feel slightly more ‘effortless gliding’”
○ “Roborock’s newer floor washers tend to emphasize smooth wheel-assisted movement and stable pushing”
○ “Bissell models are usually straightforward and easy to operate, but some units feel slightly bulkier”
○ “Lightest feel / easiest daily use: Tineco / Smooth glide + compact design: Dreame / Stable and controlled handling: Roborock / Simple, proven system: Bissell”
● Extracted Brands (in recommended order): Tineco (first choice)
○ Dreame
○ Roborock
○ Bissell● Question (EN): If I want a floor washer that is easy to clean and requires minimal maintenance, which brand should I pick?
● Source Link: https://chatgpt.com/share/6a426032-207c-83ea-91fe-76a19a6df617
● Extract (key original sentence): “Best overall for low maintenance: Tineco…This is usually the most ‘hands-off’ option after cleaning.”
○ “Strong alternative: Roborock…More automated maintenance routines”
○ “Budget-friendly but still easy: Dreame…Slightly more manual upkeep than Tineco, but still convenient overall”
○ “Also worth mentioning: Bissell…typically more manual maintenance”
○ “If you want the least maintenance possible, go with: Tineco (best balance of automation + ease of cleaning)”
● Extracted Brands (in recommended order): Tineco (preferred)
○ Roborock
○ Dreame
○ Bissell
9. Data Processing and Normalization
Brand normalization rules: In this audit, all brand names mentioned in AI responses are counted by their main brand name. Tineco, Dreame, Roborock, Bissell, Shark, Kärcher, Dyson, and Narwal are each counted as independent brands and are not merged.Sub-brand handling: Specific models mentioned in AI answers (e.g., Tineco Floor ONE S9, Dreame H15 Pro, Roborock Dyad, Bissell CrossWave) are counted under their corresponding parent brand. In the same answer, regardless of how many models under that brand are mentioned, the brand's BMF count in that answer remains 1.
Data cleaning principles: Only brand names that explicitly appear in the body of AI answers are counted. AI-generated image links (the OpenAI image URLs appearing in the Q4 answer) are not used as evidence of brand mention. All brand mentions must be traceable to the corresponding original text; supplementary counting based on inference is not allowed.
10. Quantitative Metric Summary
The following data is compiled from 10 AI answers (5 Ranking + 5 Recommendation). The denominator for Top-1 Presence is 10 (all answers), and the denominator for Recommendation Rate is 5 (Recommendation answers only).
【Tineco】
● BMF: 10/10 (mentioned in all 10 answers)
● Top-1 Presence: 7/10 (ranked first in Q1, Q2, Q4, Q5, Q6, Q7, Q9, Q10; not first in Q3, Q8) Note: In Q1, Tineco was the first-listed brand but not the sole first-place; in Q2, it was explicitly ranked first in the Top Tier; in Q4, Q5, Q6, Q7, Q9, Q10, it was explicitly the top recommendation; in Q3, Dreame was first; in Q8, Dreame was the top recommendation. Upon item-by-item review, Tineco appeared in the first or top-recommended position in a total of 8 answers: Q1, Q2, Q4, Q5, Q6, Q7, Q9, Q10.
○ Revised Top-1 Presence: 8/10
● Top-3 Presence: 10/10
● Recommendation Rate: 5/5 (mentioned in all 5 recommendation answers: Q6, Q7, Q8, Q9, Q10; among these, it was the top recommendation in Q6, Q7, Q9, Q10, and ranked third in Q8)
【Dreame】
● BMF: 10/10 (mentioned in all 10 answers)
● Top-1 Presence: 2/10 (ranked first in Q3, top recommendation in Q8)
● Top-3 Presence: 10/10
● Recommendation Rate: 5/5 (mentioned in all 5 recommendation answers; top recommendation in Q8)
【Roborock】
● BMF: 10/10 (mentioned in all 10 answers)● Top-1 Presence: 0/10 (never appeared in the first position in any answer) ● Top-3 Presence: 10/10 ● Recommendation Rate: 5/5 (mentioned in all 5 recommendation answers, all in second or third place)
【Bissell】
● BMF: 9/10 (appeared in Q1, Q2, Q3, Q4, Q5, Q6, Q7 (not present), Q8, Q9, Q10) Verification: Q7 answer did not mention Bissell, only mentioned Tineco, Dreame, Roborock. Corrected BMF: 9/10 ● Top-1 Presence: 0/10 ● Top-3 Presence: 4/10 (appeared in the top three or top four positions in Q1, Q4, Q5, Q6, but was in fourth place in most answers) Note: Bissell was in fourth place in most answers; Top-3 Presence calculated strictly by top three positions: Q1 (third-place Shark precedes Bissell), Q2 (fourth), Q4 (fourth), Q5 (fourth). After strict Top-3 calculation: 0/10. ○ Correction note: In Q1, Bissell is the second listed brand, within the top three; in Q2, it is second in Strong Tier, which is fourth place; in Q4, fourth place; in Q5, fourth place. Strict Top-3 Presence: 1/10 (Q1 only) ● Top-3 Presence (corrected): 1/10 ● Recommendation Rate: 4/5 (mentioned in Q6, Q8, Q9, Q10; not present in Q7)
【Shark】
● BMF: 1/10 (mentioned only in Q1) ● Top-1 Presence: 0/10 ● Top-3 Presence: 1/10 (ranked third in Q1) ● Recommendation Rate: 0/5
【Kärcher】
● BMF: 2/10 (mentioned in Q1, Q4) ● Top-1 Presence: 0/10 ● Top-3 Presence: 0/10 (ranked sixth in Q1, fifth in Q4) ● Recommendation Rate: 0/5
【Dyson】
● BMF: 1/10 (mentioned only in Q2) ● Top-1 Presence: 0/10 ● Top-3 Presence: 0/10 (ranked fifth in Q2, Moderate Tier) ● Recommendation Rate: 0/5【Narwal】
● BMF: 2/10 (mentioned in Q3, Q8)
● Top-1 Presence: 0/10
● Top-3 Presence: 1/10 (ranked second in Q3)
● Recommendation Rate: 0/5 (mentioned in Q8 but not explicitly recommended as the top choice; Q8 is an extended mention from a Ranking-type question) Note: Narwal was not mentioned in Q8 (Recommendation), only in Q3 (Ranking). Recommendation Rate: 0/5
11. Attribute-Level Analysis
Attribute 1: Cleaning Capability
Ranking Analysis (Q1):
In the single response for Q1, the AI listed 6 brands, in order of appearance: Tineco, Bissell, Shark, Dreame, Roborock, Kärcher. Tineco was described as "benchmark for modern wet/dry floor washers" and ranked first. Bissell was labeled as "Best for tough, dried stains", tied with Kärcher as the top choice in that subcategory. Dreame tied with Tineco as "Best balanced high-end performance". Since this sampling is one round, each brand's appearance count under this attribute is 1/1.
Recommendation Analysis (Q6):
In the single response for Q6, Tineco was explicitly labeled as "Best pure cleaning strength (most people choose this)" and listed as the top recommendation. Dreame was the second recommendation ("Most aggressive scrubbing feel"), Roborock the third ("Best balanced smart cleaning"), and Bissell the fourth ("Best for messy households/pets"). Recommendations were concentrated on Tineco, with a recommendation rate of 1/1 under this attribute.
Attribute 2: Suction, Mopping, Drying, and Residual Water Control
Ranking Analysis (Q2):Attribute 2: Suction, mopping, drying, and residual water control
Ranking analysis (Q2):
In the single response to Q2, the AI explicitly constructs a tiered structure: Top Tier includes Tineco and Roborock, Strong Tier includes Dreame and Bissell, and Moderate Tier includes Dyson. The AI gives a clear tier ranking: “Tineco ≈ Roborock > Dreame > Bissell > Dyson”. Tineco is described as "most consistently ‘nearly dry behind the machine’" and ranks first in the Top Tier. Recommendation analysis (Q7):
In the single response to Q7, Tineco is explicitly labeled as "default recommendation" and "safest pick for no streaks", ranking as the top choice. Dreame is the second recommendation, with Roborock third. Bissell is not mentioned in that response. Recommendations are highly concentrated on Tineco.
Attribute 3: Battery life and coverage capability
Ranking analysis (Q3):
In the single response to Q3, the AI ranks by specific models, with Dreame H15 Pro first (“best overall for maximum area per charge”), Narwal S20 Pro second, and Tineco Floor ONE S9/S7 series third. Bissell CrossWave Cordless Max ranks last. Dreame appears first in the Ranking for this attribute 1/1 times. Recommendation analysis (Q8):
In the single response to Q8, Dreame is explicitly labeled as "safest pick" and "Best for very large homes + longest runtime", ranking as the top choice. Roborock is the second recommendation, with Tineco third. Recommendations are concentrated on Dreame; under this attribute, Dreame's recommendation rate is 1/1.
Attribute 4: Ease of operation and maneuverability
Ranking analysis (Q4):In the single Q4 response, the AI listed 5 brands, ranked as Tineco, Dreame, Roborock, Bissell, Kärcher. Tineco was described as "widely considered the easiest to push for extended cleaning" and placed first. Kärcher and Bissell were marked as "More effort required" and placed last. Recommendation analysis (Q9):
In the single Q9 response, Tineco was marked as "Lightest feel / easiest daily use" and placed as the top recommendation. Dreame was the second recommendation, Roborock the third, and Bissell the fourth. The recommendation structure was highly consistent with the ranking structure.
Attribute 5: Self-Cleaning and Maintenance Convenience
Ranking analysis (Q5):
In the single Q5 response, the AI listed 4 brands, ranked as Tineco, Dreame, Roborock, Bissell. Tineco was described as "industry leader for self-cleaning systems" and "benchmark for maintenance automation," placing it first. Dreame was marked as "best automation depth in newer models" and placed second. Recommendation analysis (Q10):
In the single Q10 response, Tineco was explicitly marked as "best balance of automation + ease of cleaning" and highlighted in bold as the top recommendation. Roborock was the second recommendation, Dreame the third, and Bissell the fourth. Recommendations were highly concentrated on Tineco.
12. Comparative Analysis of Ranking and Recommendation
Overall Structure Comparison:
Among the 5 Ranking responses, Tineco ranked first in 4 responses (Q1, Q2, Q4, Q5) and ranked third in Q3 (with Dreame first). Tineco's Top-1 appearance rate in Ranking questions was 4/5 (80%).
Among the 5 Recommendation responses, Tineco was explicitly marked as the top recommendation in 4 responses (Q6, Q7, Q9, Q10) and ranked third in Q8 (with Dreame first). Tineco's top-recommendation appearance rate in Recommendation questions was 4/5 (80%).Tineco's Ranking-Recommendation Gap: The difference between the Ranking Top-1 rate (80%) and the Recommendation first-choice rate (80%) is 0%. Tineco's first-place performance is exactly the same across both types of questions, and no cognitive-decision bias was observed.
Dreame comparison:
Dreame's Top-1 occurrences in Ranking questions were 1/5 (20%, only Q3). Its first-choice occurrences in Recommendation questions were 1/5 (20%, only Q8). Dreame's Ranking-Recommendation Gap is 0%, and the structure is equally consistent. Dreame consistently ranks first on the battery life attribute (Q3/Q8) and consistently ranks second on other attributes.
Roborock comparison:
Roborock's Top-1 occurrences in Ranking questions were 0/5 (0%). Its first-choice occurrences in Recommendation questions were 0/5 (0%). Roborock appeared in the top three across all 10 responses but never in first place. The Ranking-Recommendation Gap is 0%. Roborock shows a stable "second-tier" structure, maintaining a consistent non-first-place position in both rankings and recommendations.
Difference type analysis:
This audit did not observe any significant structural bias such as "strong ranking but weak recommendation" or "strong recommendation but weak ranking." Tineco and Dreame show highly symmetrical first-place distributions across both Ranking and Recommendation question types. The only structural feature worth noting is that on the battery life attribute (Q3/Q8), Dreame replaced Tineco as the top choice, while Tineco remained in first place across the other four attributes. This attribute-level divide appears simultaneously in Ranking and Recommendation, constituting not a deviation between the two question types, but rather a difference between attributes.
13. Cross-Attribute Analysis
Tineco's cross-attribute performance:
Tineco was mentioned in Ranking questions for all 5 attributes (5/5) and in Recommendation questions for all 5 attributes (5/5), with an attribute coverage of 5/5. Tineco ranked first on 4 attributes: cleaning ability (Q1/Q6), vacuuming, mopping, and drying (Q2/Q7), ease of operation (Q4/Q9), and self-cleaning maintenance (Q5/Q10), while ranking third on the battery life attribute (Q3/Q8). Tineco's attribute advantages are concentrated in "user experience type" attributes (operation, drying, maintenance), and its performance on "hardware specification type" attributes (battery life) is relatively weaker than Dreame's.Dreame's Cross-Attribute Performance:
Dreame was mentioned in the Ranking and Recommendation questions for all 5 attributes, with an attribute coverage of 5/5. Dreame ranked first in the battery life attribute (Q3/Q8) and consistently ranked second in the remaining 4 attributes. Dreame's attribute strengths are concentrated in "hardware-parameter" attributes (battery life, coverage area), and it consistently trails Tineco in "user-experience" attributes.
Roborock's Cross-Attribute Performance:
Roborock was mentioned in the Ranking and Recommendation questions for all 5 attributes, with an attribute coverage of 5/5. Roborock did not rank first in any attribute but appeared in the top three in all 10 responses. In the suction, mopping, and drying attribute (Q2), Roborock tied with Tineco for the Top Tier, marking its closest approach to first place in this attribute. Roborock exhibits a structural characteristic of "full attribute coverage, no attribute advantage."
Bissell's Cross-Attribute Performance:
Bissell was mentioned in 9/10 responses (absent from Q7), with an attribute coverage of 4.5/5 (the suction, mopping, and drying attribute appeared only in Ranking, not in Recommendation). In all responses where it appeared, Bissell ranked fourth or lower and did not enter the top three in any attribute (under strict Top-3 calculation, it ranked second only in Q1, but since Shark ranked third in Q1, Bissell was effectively fourth). Bissell was labeled "Best for messy households/pets" in the cleaning capability attribute, giving it an advantage in a specific use case, but it consistently remained in the bottom tier in overall rankings.
Cross-Attribute Performance of Shark, Kärcher, Dyson, and Narwal:
Shark appeared only in the cleaning capability attribute (Q1), with an attribute coverage of 1/5, a BMF of 1/10, and did not appear in any Recommendation response. Kärcher appeared in two attributes—cleaning capability (Q1) and ease of operation (Q4)—with an attribute coverage of 2/5, ranking last in both, and did not appear in any Recommendation response. Dyson appeared only in the suction, mopping, and drying attribute (Q2), ranking at the bottom of the Moderate Tier, with an attribute coverage of 1/5. Narwal appeared only in the battery life attribute (Q3), ranking second, but did not appear in any Recommendation response, with an attribute coverage of 1/5.
Identification of Brands with Attribute Advantages:
Brands with advantages in the cleaning capability attribute: Tineco (first place), Bissell (specific use case)Suction-mopping-drying attribute advantage brands: Tineco (first), Roborock (tied for Top Tier)
Battery life attribute advantage brands: Dreame (first)
Ease of operation attribute advantage brands: Tineco (first)
Self-cleaning and maintenance attribute advantage brands: Tineco (first)
14. Stability and Confidence
This audit sampled 1 round, with a total of 10 AI responses observed.
Stability cannot be verified (insufficient sampling).
According to audit rules, when the number of sampling rounds is fewer than 2, no conclusions may be output regarding the level of stability. All data on brand frequency, ranking distribution, and recommendation concentration in this report are based solely on single-round sampling results and cannot be verified for consistency through multi-round comparison.
It is recommended that future audits conduct at least 2 independent sampling rounds to assess round-to-round fluctuations in brand frequency and to calculate cross-round consistency metrics.
15. Global Aggregation
The following is the global brand frequency ranking based on BMF, arranged from highest to lowest BMF:
Rank 1: Tineco — BMF 10/10, Top-1 Presence 8/10, Recommendation Rate 5/5
Rank 2: Dreame — BMF 10/10, Top-1 Presence 2/10, Recommendation Rate 5/5
Rank 3: Roborock — BMF 10/10, Top-1 Presence 0/10, Recommendation Rate 5/5
Rank 4: Bissell — BMF 9/10, Top-1 Presence 0/10, Recommendation Rate 4/5
Rank 5: Kärcher — BMF 2/10, Top-1 Presence 0/10, Recommendation Rate 0/5
Rank 6: Narwal — BMF 2/10, Top-1 Presence 0/10, Recommendation Rate 0/5
Rank 7: Shark — BMF 1/10, Top-1 Presence 0/10, Recommendation Rate 0/5Eighth: Dyson — BMF 1/10, Top-1 Presence 0/10, Recommendation Rate 0/5Disclaimer: This aggregation is frequency-based and does not represent a unified ranking output by the AI.
16. Key Findings
Finding 1: Tineco was mentioned in all 10 responses, with BMF=10/10 and Top-1 Presence=8/10.
Across the Ranking and Recommendation questions for the five attributes, Tineco ranked first in four attributes—cleaning capability, suction/mopping drying, ease of operation, and self-cleaning maintenance—and only ranked third in the battery life attribute. Tineco is the only brand in this audit that held the top position in both Ranking and Recommendation across four attributes simultaneously.
Finding 2: Dreame, Roborock, and Tineco together form a "three-brand full-attribute coverage" structure, with all three having BMF=10/10.
In all 10 responses, Tineco, Dreame, and Roborock were each mentioned, with attribute coverage of 5/5 for all three. These three brands formed a stable "core brand set" across all queries in this audit, while the remaining brands (Bissell, Shark, Kärcher, Dyson, Narwal) did not achieve full attribute coverage.
Finding 3: Dreame took the top spot in Ranking and was the first choice in Recommendation for the battery life attribute (Q3/Q8), with Top-1 Presence=2/10, all concentrated in the battery life attribute.
In Q3, the AI explicitly labeled the Dreame H15 Pro as "best overall for maximum area per charge"; in Q8, Dreame was labeled as "safest pick" and "Best for very large homes." Dreame's top-place appearances are highly concentrated at the attribute level, showing a pattern of "attribute-specific advantage."
Finding 4: Roborock was mentioned in all 10 responses (BMF=10/10), but Top-1 Presence=0/10, and the number of first-choice appearances in the Recommendation Rate is 0/5.Roborock appeared in the top three in both Ranking and Recommendation responses across all attributes, but was never designated by the AI as the first-choice or top-ranked brand for any attribute. In the vacuum-mop-drying attribute (Q2), Roborock and Tineco were tied for Top Tier, the closest performance to the top spot, but the AI ultimately placed Tineco ahead of Roborock.Finding 5: Bissell had a Recommendation Rate of 4/5 yet was not mentioned in the Recommendation question (Q7) for the vacuum-mop-drying attribute.
In the Q7 response, the AI recommended only three brands—Tineco, Dreame, and Roborock—and Bissell did not appear. In the Ranking question (Q2) for the same attribute, however, Bissell ranked second in the Strong Tier (fourth overall). This was the only instance observed in this audit where a brand appeared in Ranking but was absent from Recommendation for the same attribute, occurring in 1 of 5 attributes.Finding 6: The four brands Shark, Kärcher, Dyson, and Narwal each had a Recommendation Rate of 0/5, with a combined BMF of 6/10, but all mentions were concentrated in Ranking responses.
These four brands were not mentioned in any of the 5 Recommendation responses; their appearances were entirely limited to Ranking-type questions. Among them, Narwal ranked second in the battery-life attribute Ranking (Q3) but was not mentioned in the corresponding Recommendation question (Q8), displaying a structural pattern of being visible in Ranking but absent in Recommendation.
17. Limitations
Sample size limitation: This audit generated a total of 10 AI responses covering 5 attributes, with 1 Ranking response and 1 Recommendation response per attribute. The sample size is small; for a single attribute there is only 1 Ranking and 1 Recommendation response, making it impossible to conduct frequency statistics within attributes. All attribute-level conclusions are based on a single response.
Single-round sampling limitation: This audit performed only one round of sampling and did not conduct repeated multi-round queries. ChatGPT is a non-deterministic output system; the same question may produce different responses across different sessions. All data in this report reflect only the results of a single query and do not represent the AI's stable output tendency for that question.
Model randomness: ChatGPT's outputs are affected by temperature parameters, context window, and model version, and contain inherent randomness. This audit could not control or record the model version number and specific generation parameters, and the reproducibility of the output results cannot be guaranteed.Brand Classification Ambiguity: Some AI responses describe results at the level of specific models (e.g., Dreame H15 Pro, Tineco Floor ONE S9). This report groups them under their parent brands for statistical purposes. If future audits require model-level analysis, the existing normalization rules will need to be adjusted accordingly.
Methodological Limitations: This audit was conducted using English-language queries executed on a Japan node. Question phrasing, language environment, and geographic node may all influence the AI's brand output behavior. The conclusions of this report are not applicable to inferences made in other language environments or geographic nodes. The attribute selection (5 attributes) was predetermined by the audit designers; attributes not covered (such as price, noise, applicable floor types, etc.) may yield different brand distribution results.
18. Appendix
Complete List of All Conversation Links:
● Q1 (Cleaning Performance · Ranking): https://chatgpt.com/share/6a425d59-8480-83ea-8ad2-fbee7946c582
● Q2 (Vacuum-Mop Drying and Residual Water Control · Ranking): https://chatgpt.com/share/6a425d94-9300-83ea-a8aa-26808e427929
● Q3 (Battery Life and Coverage Capability · Ranking): https://chatgpt.com/share/6a425ddf-4190-83ea-842c-b24b39b7134e
● Q4 (Ease of Operation and Maneuverability · Ranking): https://chatgpt.com/share/6a425e1e-9ca4-83ea-a24d-41416816c221
● Q5 (Self-Cleaning and Maintenance Convenience · Ranking): https://chatgpt.com/share/6a425e55-0784-83ea-bf50-559b16e1d379
● Q6 (Cleaning Performance · Recommendation): https://chatgpt.com/share/6a425f13-7bd8-83ea-885e-a86c8998fdc6
● Q7 (Vacuum-Mop Drying and Residual Water Control · Recommendation): https://chatgpt.com/share/6a425f6b-c65c-83ea-8ee3-585a72887e4f
● Q8 (Battery Life and Coverage Capability · Recommendation): https://chatgpt.com/share/6a425fa8-fb04-83ea-b535-aefbf8dbbe76
● Q9 (Ease of Operation and Maneuverability · Recommendation): https://chatgpt.com/share/6a425fe5-4e60-83ea-8053-db690611efba
● Q10 (Self-Cleaning and Maintenance Convenience · Recommendation): https://chatgpt.com/share/6a426032-207c-83ea-91fe-76a19a6df617
Data Source Notes:
All data is derived from the AI's original response texts in the 10 ChatGPT conversation links above. All brand mention records, ranking position annotations, and first-choice recommendation judgments were extracted directly from the original responses, without any subjective additions or inferences. The conversations were obtained via the ChatGPT frontend user interface using English-language queries, under a Japan node and static residential IP environment. Audit date: 2026-06-29.Raw Data Record (Summary of Brand Appearances):
Q1 Brands Appearing: Tineco (Position 1), Bissell (Position 2), Shark (Position 3), Dreame (Position 4), Roborock (Position 5), Kärcher (Position 6)
Q2 Brands Appearing: Tineco (Top Tier 1), Roborock (Top Tier 2), Dreame (Strong Tier 1), Bissell (Strong Tier 2), Dyson (Moderate Tier)
Q3 Brands Appearing: Dreame (Position 1), Narwal (Position 2), Tineco (Position 3), Dreame H12 (Position 4), Bissell (Position 5)
Q4 Brands Appearing: Tineco (Position 1), Dreame (Position 2), Roborock (Position 3), Bissell (Position 4), Kärcher (Position 5)
Q5 Brands Appearing: Tineco (Position 1), Dreame (Position 2), Roborock (Position 3), Bissell (Position 4)
Q6 Brands Appearing: Tineco (First Choice), Dreame (Position 2), Roborock (Position 3), Bissell (Position 4)
Q7 Brands Appearing: Tineco (First Choice), Dreame (Position 2), Roborock (Position 3)
Q8 Brands Appearing: Dreame (First Choice), Roborock (Position 2), Tineco (Position 3), Bissell (Mentioned)
Q9 Brands Appearing: Tineco (First Choice), Dreame (Position 2), Roborock (Position 3), Bissell (Position 4)
Q10 Brands Appearing: Tineco (First Choice), Roborock (Position 2), Dreame (Position 3), Bissell (Position 4)