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What is Claude Opus 5.5?

Claude Opus 5.5 is Anthropic’s September 22, 2026 model. Anthropic says it performs at the level of Claude Fable 5.1 on most work, costs about 40% less than Opus 5 to run on typical workloads, and generates output more than 30% faster. It supports adaptive thinking, tool use, computer use and image input.

How much does Claude Opus 5.5 cost?

Anthropic lists Opus 5.5 at $4 per million input tokens and $20 output, 20% below Opus 5’s $5 and $25. Cache reads cost $0.20 and cache writes $5; fast mode costs $8 input and $40 output. The table above shows OpenRouter’s recorded rates; real turns vary with thinking, tool calls and transcript length. For Fable’s pricing, see Claude Fable pricing.

Claude Opus 5.5 vs Opus 5

Anthropic reports Opus 5.5 ahead of Opus 5 on its published coding evaluations, including Terminal-Bench 4.0 (66.4% vs 52.3%). These are provider-reported results, not OpenCraft measurements. Compare Claude Opus 5 and Opus 5.5.

Claude Opus 5.5 vs Fable 5.1 and GPT-6 Sol

Anthropic says Opus 5.5 matches Fable 5.1 on most work at a lower price. OpenAI released GPT-6 Sol the same day at a lower token price. Run the same prompt in separate chats to see which answers your task better: Opus 5.5 vs Fable 5.1 or Opus 5.5 vs GPT-6 Sol.

Is claude-opus-5-5 the same model?

Yes. Anthropic’s API calls it claude-opus-5-5; OpenCraft routes it as anthropic/claude-opus-5.5. It is also available on AWS, Google Cloud and Microsoft Azure.

Release facts checked September 22, 2026 against Anthropic’s Claude Opus 5.5 announcement. For current rates and availability, use the live provider listings.