# Anthropic releases Claude Sonnet 5.5

The release of Claude Sonnet 5.5 from Anthropic was recorded on 28 Sep 2026. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $2.00 per million input tokens and $10.00 per million output tokens. 18 evidence links.

- Kind: Launch
- Developer: Anthropic
- Confidence: Confirmed
- First seen: 2026-09-28T17:23:40.535Z
- Model: [Claude Sonnet 5.5](https://alexgetman.com/models/anthropic/claude-sonnet-5-5/)
- Canonical: https://alexgetman.com/signals/2026/09/28/claude-sonnet-5-5/

## Evidence links

- [Claude Code · model ids](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.284)
- [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-sonnet-5-5)
- [Anthropic · site pages](https://www.anthropic.com/claude-sonnet-5-5)
- [OpenRouter](https://openrouter.ai/anthropic/claude-sonnet-5.5)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)
- [Anthropic · deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- [OpenRouter](https://openrouter.ai/anthropic/claude-sonnet-5.5:batch)
- [OpenCode · discovery](https://opencode.ai/data/anthropic/claude-sonnet-5-5)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [OpenCode Zen · models](https://opencode.ai/zen)
- [Command Code · models](https://commandcode.ai/docs/reference/cli/models)
- [Claude Docs](https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5-5)
- [DesignArena · uicomponent](https://www.designarena.ai/leaderboard/ui-components)
- [DesignArena · website](https://www.designarena.ai/leaderboard/website)
- [Anthropic · API pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [models.dev · catalogue](https://models.dev/#claude-sonnet-5-5)
- [models.dev · catalogue](https://models.dev/#claude-sonnet-5.5)