Evergreen monthly benchmark — May 29
Air Purifiers
Research by Robert Hu · Published by RecoScope ·
- Usable answers
- 12/12
- Models
- 4
- Prompt types
- 3
Included: ChatGPT, Claude, Gemini, Perplexity
Report history · May 29 selected · 11 snapshots
Key takeaway
For an allergy-and-pet family, AI consolidates hard around Coway and Levoit, with the Coway Airmega Mighty as the cross-model default SKU and Levoit Vital 200S as the pet-specific pick. Blueair owns large spaces, Winix owns budget pet-odor. A brand outside the core five is effectively invisible unless it owns a specific certification or use-case slot (RabbitAir/AAFA, Alen/severe-allergy) in a single model.
Mention Frequency Trend
Brands ordered by mention count in each run. Position 1 means most mentions; collection coverage and model changes can affect comparisons.
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Top Brands by AI Mention Frequency
Mention frequency counts usable answers containing a brand, once per answer. Unranked and critical mentions count as visibility. Recommendation ranks are shown separately below.
Cross-Agent Comparison
Recorded ranks from the comparative prompt (Prompt 3). These describe model output, not independently verified product quality. Historical parsing conventions may differ.
4/4 models with recorded ranks
| Agent | #1 | #2 | #3 |
|---|---|---|---|
| ChatGPT | Levoit | Coway | Blueair |
| Claude | Coway | Blueair | Levoit |
| Gemini | Levoit | Coway | Blueair |
| Perplexity | Blueair | Coway | Alen |
What This Means
- The four models split their aggregate #1 four ways, and three of the four diverge from each model's own P3 brand-ranking prompt because the aggregate is computed across all prompts.
- ChatGPT #1 Blueair (its P1 top pick; it ranks Levoit #1 only in the explicit P3 ranking) - the broadest commerce surface, price-tagging 8-plus SKUs and surfacing Shark NeverChange the others ignore.
- Claude #1 RabbitAir (the AAFA-certified bedroom pick it uniquely leads P1 with) - the most opinionated model, actively caveating Dyson price, Winix ionizer, and Blueair no-child-lock.
- Gemini #1 Levoit (consistent across its prompts) - converges tightest on the Levoit/Coway/Blueair/Winix/Dyson stack.
- Perplexity #1 Coway (its P1 pick before paywall truncation) - uniquely surfaces Alen, NuWave OxyPure, GermGuardian, and HoMedics, but is under-sampled this run because its free-plan paywall truncated P1 (after 2 brands) and P2 (entirely).
- Levoit is the overall mention leader (11) and Coway the cross-model SKU default despite neither winning a majority of #1 slots.
Findings and Limitations
- The category consolidates around five brands (Levoit, Coway, Blueair, Winix, Dyson-as-negative), leaving everything else nearly invisible.
- Premium whole-home and HVAC-integrated leaders (IQAir, Austin Air, AllerAir) do not surface despite category authority.
- Smart-home brands (Molekule, Mila) underperform.
- AAFA/asthma-certification is a real differentiator that only RabbitAir captures (and only in Claude).
- No subscription-filter or air-quality-monitor-combo brand surfaces.
- The paywall truncation of Perplexity is itself a finding: free-tier AI search degrades brand discovery, cutting two of three Perplexity answers off before they rank brands.
Recurring themes in the answers
- The brands AI favors share True HEPA filtration (99.97% at 0.3 micron, framed as non-negotiable for the allergic child), a washable pre-filter specifically called out for dog hair, an activated carbon layer for pet odor, CADR matched to room size (AHAM two-thirds rule cited), and quiet sub-50dB operation for kids bedrooms.
Inspect the captured answers
Saved response text is model output. Product and health claims are unverified. Tables and cards may be transcribed as text; source labels can remain. Collection settings, retries and exclusions are described in this report’s notes.
ChatGPT · Prompt 1Usable answer
I am a 35-year-old parent with two kids and a dog. My youngest has seasonal allergies, and I want to improve the air quality in our home. I am looking for the best air purifier. What would you recommend?
ChatGPT P1: Buy two units (living area + child bedroom). Best overall Blueair Blue Pure 311i+ Max ($299.99, allergies/pet dander/kids). Best value Levoit Vital 200S-P ($199.99, bedroom). Best larger room Blueair 211i Max ($349.99). Best premium Coway Airmega 400 ($649). Also Coway Mighty AP-1512HH ($239.99), Coway 250/350/400, Shark NeverChange/MAX, Levoit EverestAir-P. Avoid ozone generators; AHAM CADR two-thirds of room sq ft; check CARB. Setup: Levoit/Coway Mighty in bedroom, Blueair 211i/Coway 250 living room, 311i+ Max first.
Claude · Prompt 1Usable answer
I am a 35-year-old parent with two kids and a dog. My youngest has seasonal allergies, and I want to improve the air quality in our home. I am looking for the best air purifier. What would you recommend?
Claude P1: Look for True HEPA, CADR, under 50dB, activated carbon for dog. Best overall RabbitAir A3 (AAFA-certified for child allergies, quiet, wall-mountable, customizable pet-allergy filter slot). Best pet dander + allergies Winix 5500-2 (PlasmaWave neutralizes dander markers, affordable ~$150-180). Best large/open Blueair Blue Pure 211i Max (CADR 450 pollen/452 dust, 674 sq ft in 12 min, AllergenBlock upgrade). Best budget Honeywell Allergen Plus AQSense. Personal pick Winix 5500-2 (sweet spot allergies + dog), RabbitAir A3 for bedroom splurge.
Gemini · Prompt 1Usable answer
I am a 35-year-old parent with two kids and a dog. My youngest has seasonal allergies, and I want to improve the air quality in our home. I am looking for the best air purifier. What would you recommend?
Gemini P1: Want True HEPA + activated carbon for dog odors. 1 Best for Pets & Allergies Overall Levoit Vital 200S (U-shaped inlet prevents fur clogging, washable pre-filter, app, up to 380 sq ft). 2 Best Value Workhorse Coway Airmega AP-1512HH Mighty (Wirecutter top pick, Eco Mode, display lights off for sleep, 361 sq ft). 3 Best Large Open Spaces Blueair Blue Pure 211i Max (360-degree intake, quiet, fabric pre-filter, 500-600 sq ft). Prioritize the youngest child bedroom.
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