ClaudeModel releaseGASep 28, 2026

Claude Sonnet 5.5

claude-sonnet-5-5

Claude Sonnet 5.5 has been released. Context window is 1M tokens, maximum output tokens 128k, pricing is $4 per MTok / $20, and available across multiple environments.

1M-token context window
128k maximum output tokens
Always-on reasoning
Multi-cloud support

Official announcement →

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