Claude Sonnet 5.5
Faster Sonnet model for everyday coding and document work
Paid
Language
1000000
context tokens
Undisclosed
parameters
Proprietary
license
Sep 2026
released
Anthropic released Claude Sonnet 5.5 on September 28, 2026, a week after Claude Opus 5.5. Anthropic says it generates output more than 30% faster than Claude Sonnet 5 while keeping the same API pricing of $2 per million input tokens and $10 per million output tokens, with cached-input reads at $0.20. The context window stays at 1 million tokens.
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