Sonnet 5.5 ships: faster, same price, org-bound preserved thinking
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- ClaudeDevs
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Sonnet 5.5 is smarter, more efficient, and 30% faster than Sonnet 5. It costs up to 30% less for most work, so your Claude Code usage goes further too. Use it for well-scoped everyday tasks like fixing bugs and quickly iterating on features. https://t.co/hSlp8eClQS
Price is the same as Sonnet 5: $2/$10 per million tokens with cache reads at $0.20. Thinking is always on but you can use `between_tools` to turn off upfront thinking. Here’s our Sonnet 5.5 migration guide: https://t.co/8CUKQrUqNO.
We recommend starting with Opus for large projects and Sonnet for tasks where you need to balance quality with speed and cost. Claude apps default to medium effort, while Platform is at high. Cranking Sonnet to max loses some of the balance (and you might want to consider Opus).
We’re extending preserved thinking with Sonnet 5.5 to curb distillation attacks via account-switching. Thinking stays in the original org that generated it, so if you switch accounts mid-session, Claude will reread the session and generate new thinking. https://t.co/AmQ2qiNDPR
- Thinking is always on in Sonnet 5.5, but Anthropic says the `between_tools` setting turns off the upfront thinking pass.
- Anthropic recommends Opus for large projects and Sonnet 5.5 where quality must be balanced against speed and cost. Claude apps default to medium effort and the Platform to high, and Anthropic notes that running Sonnet at max loses some of that balance.
- Anthropic says org-bound preserved thinking is meant to curb attacks that work by switching accounts; after a mid-session switch, Claude rereads the session and generates new thinking instead of reusing the prior org's.
- distillation — Training a small, cheap model to imitate a big one's outputs, keeping much of the capability at a fraction of the cost.
Sonnet 5.5 keeps $2/$10 pricing while claiming up to 30% lower cost for most work. Preserved thinking now stays within the originating org, so switching accounts mid-session forces new thinking.
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