# Claude Haiku 4.5 spotted on Arena

Claude Haiku 4.5 is a model from Anthropic, released on 15 Oct 2025. First seen 10 Nov 2026. Catalogues list a 200,000 tokens context window. 2 evidence links.

- Kind: Sighting
- Developer: Anthropic
- Confidence: Supported
- First seen: 2026-11-10T19:23:48.038Z
- Model: [Claude Haiku 4.5](https://alexgetman.com/models/anthropic/claude-haiku-4-5/)
- Canonical: https://alexgetman.com/signals/2026/11/10/claude-haiku-4-5/

## Evidence links

- [Arena · leaderboards](https://www.anthropic.com/news/claude-haiku-4-5)
- [Anthropic · model index](https://platform.claude.com/docs/en/models/haiku-4-5/overview)