# Warmup Inbox: how AI models rank it, October 2026

GTM AI Recommendation Index, October 2026 Edition. Named in 4 judge labels across 1 categories by 4 of 14 models. Page: https://gtm-ai-index.com/vendors/warmup-inbox/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| Email deliverability and testing tools | 2% | 24 | 25% | 4 |

## What the models said for it

- "Warmup Inbox is a strong default pick for email deliverability" (GPT-5.4 mini, Email deliverability)
- "Warmup Inbox ($12/mo per inbox): For warming new domains." (Grok 4.1 Fast, Email deliverability)

## And against it

- "Avoid relying on these for core deliverability." (DeepSeek V4 Flash, Email deliverability)

## Record

- Method: https://gtm-ai-index.com/methodology/
- Raw judge labels and full responses: https://gtm-ai-index.com/data/
- License: CC BY 4.0. Cite as GTM AI Recommendation Index, October 2026 Edition, gtm-ai-index.com.