AI Shortlist Index · October 2026 snapshot · Prompt Set v1.0
HVAC Filter Delivery: AI Shortlist Index, October 2026
The hvac filter delivery ranking as the October 2026 edition measured it: 50 runs across 25 prompts. The live category page carries the current edition; this one does not change.
Editorial read
Fifty runs, one per prompt on each engine: ChatGPT from its app on 27 October 2026, Claude through the Anthropic API on 31 October. FilterTime was named in 95% of runs on both engines, Second Nature in 82% and Filterbuy in 54%. filtertime.com was the most-cited domain, with 42 citations. One run per prompt per engine; read it as a first reading.
Ranking
| # | Vendor | Mention rate | Engines | Consistency | Move | Trend |
|---|---|---|---|---|---|---|
| 1 | FilterTime | 95% | 2/2 | – | ▲ 1 | – |
| 2 | Second Nature | 82% | 2/2 | – | ▼ 1 | – |
| 3 | Filterbuy | 54% | 2/2 | – | – | – |
| 4 | Homestock USA | 38% | 2/2 | – | – | – |
| 5 | Beagle | 35% | 2/2 | – | – | – |
| 6 | Filters Direct USA | 20% | 2/2 | – | ▼ 1 | – |
| 7 | Latchel | 10% | 1/2 | – | ▼ 3 | – |
| 8 | Filter-Smart | 8% | 1/2 | – | – | – |
| 9 | Caliper Air | 8% | 1/2 | – | – | – |
| 10 | Piñata | 4% | 1/2 | – | – | – |
| 11 | Paylode | 2% | 1/2 | – | – | – |
Engines
| Engine | Status | Model | Runs | Note |
|---|---|---|---|---|
| ChatGPT | ran | gpt-6-thinking | 25 | |
| Claude | ran | claude-haiku-5-5 | 25 |
Part of the October 2026 edition of the AI Shortlist Index. All editions: archive.