Claude Sonnet 5.5
BalancedClosedAnthropic
Anthropic’s newer Sonnet model for everyday coding and knowledge work at the same $2/$10 token rates as Sonnet 5.
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Best for: Everyday coding · Document and slide creation · Fast iteration
Watch out: Vendor scores use Anthropic's evaluation setup. between_tools turns off up-front thinking only at high effort or below. Forced tool use and non-default temperature/top_p/top_k error; older computer_20251124 and some advisors are rejected. Thinking blocks are model/conversation-bound; progress text needs a display setting that returns it. Haiku 5.5 is announced, not released as of October 1.
- Released
- September 28, 2026
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1M
- Max output
- 128K