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AI summary
Written by AI from the official notes. Check them for exact details.Claude Opus 5.5 has been released with enhanced capabilities for coding and knowledge work.
- 1M token context window by default
- 128k max output tokens
- Always-on adaptive thinking
- Available on multiple platforms including AWS and Google Cloud
Why it matters: Developers and businesses using AI for coding and knowledge tasks should consider upgrading to leverage new features.
Full release notes
We've launched Claude Opus 5.5 (claude-opus-5-5), a model for long-running agentic coding and knowledge work. It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking, at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25). Claude Opus 5.5 is available on the Claude API, Claude in Amazon Bedrock, Claude Platform on AWS, Claude on Google Cloud, and Claude in Microsoft Foundry. See What's new in Claude Opus 5.5 for capabilities, API changes, and migration guidance.