# AI model releases in September 2025

1 confirmed release from 1 provider.

| Confirmed | Provider | Release | Models | Evidence |
|---|---|---|---|---|
| September 2025 (month precision) | Anthropic | Claude Sonnet 4.5 | [Claude Sonnet 4.5](https://benchlm.ai/models/claude-sonnet-4-5) | [Anthropic](https://www.anthropic.com/system-cards) |

Canonical page: https://benchlm.ai/model-updates/releases/september-2025