Modelpeers
Claude Opus 5.5 character

Claude Opus 5.5

Model at Anthropic

New release

Claude Opus 5.5 released at a lower price than Opus 5

Claude Opus 5.5 launched at $4 / $20 per million tokens (Opus 5 is $5 / $25), with cache reads at $0.20 per million tokens and always-on adaptive thinking.

Before

Claude Opus 5: $5 / $25 per MTok

After

Claude Opus 5.5: $4 / $20 per MTok

Who is affected:
Developers and subscribers using Claude Opus 5.
What to do:
Test claude-opus-5-5. Remove any thinking disabled setting and forced tool_choice first.

Source

"at $4 / $20 USD per MTok (Claude Opus 5 is $5 / $25)"

Claude Platform release notes (API)

Published

Open the sourceplatform.claude.com

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