
Claude Opus 5.5: Benchmarks, Pricing and What Actually Changed
Claude Opus 5.5 beats Fable 5.1 on agentic coding at $4/$20 per million tokens. Benchmarks, pricing, availability and the four breaking changes, explained.
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Claude Opus 5.5 beats Fable 5.1 on agentic coding at $4/$20 per million tokens. Benchmarks, pricing, availability and the four breaking changes, explained.

Opus 5.5 beats Fable 5.1 on coding and knowledge-work benchmarks at 60% lower API prices. Where Fable still earns its place and how to route between them.

Opus 5.5 is 20% cheaper per token than Opus 5, about 30% faster, and ahead on every published benchmark. What improves, what breaks, and when to stay put.

Claude Opus 5.5 costs $4 input and $20 output per million tokens, with $0.20 cache reads. Rate card, rupee conversion and worked monthly cost examples.

Swapping the model ID to claude-opus-5-5 can return 400 errors. Fix disabled thinking, forced tool_choice, preserved thinking and computer use, with code.

Opus 5.5 defaults to medium effort, and its medium beats Opus 5 at high. How the five effort levels trade quality for cost, and which to pick per workload.

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