# Anthropic releases Claude Opus 5.5

The release of Claude Opus 5.5 from Anthropic was recorded on 22 Sep 2026. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $4.00 per million input tokens and $20.00 per million output tokens. 17 evidence links.

- Kind: Launch
- Developer: Anthropic
- Confidence: Confirmed
- First seen: 2026-09-22T16:25:42.506Z
- Model: [Claude Opus 5.5](https://alexgetman.com/models/anthropic/claude-opus-5-5/)
- Canonical: https://alexgetman.com/signals/2026/09/22/claude-opus-5-5/

## Evidence links

- [Anthropic API](https://docs.anthropic.com/en/docs/about-claude/models)
- [Vertex AI · Model Garden](https://console.cloud.google.com/vertex-ai/publishers/anthropic/model-garden/claude-opus-5-5)
- [Anthropic](https://www.anthropic.com/claude-opus-5-5)
- [Anthropic · deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- [OpenRouter](https://openrouter.ai/anthropic/claude-opus-5.5)
- [OpenRouter](https://openrouter.ai/anthropic/claude-opus-5.5:batch)
- [Claude Code · model ids](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.280)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)
- [Command Code · models](https://commandcode.ai/docs/reference/cli/models)
- [OpenCode Zen · models](https://opencode.ai/zen)
- [Claude Docs](https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5-5)
- [DesignArena · website](https://www.designarena.ai/leaderboard/website)
- [OpenCode · discovery](https://opencode.ai/data/anthropic/claude-opus-5-5)
- [DesignArena · uicomponent](https://www.designarena.ai/leaderboard/ui-components)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [models.dev · catalogue](https://models.dev/#claude-opus-5-5)
- [models.dev · catalogue](https://models.dev/#claude-opus-5.5)