Claude Opus 5.5 matches Fable 5.1 performance at lower cost and promises less "Claudish" writing
Anthropic launched Claude Opus 5.5, matching Fable 5.1 at about 40 percent lower cost.
Anthropic launched Claude Opus 5.5 at $4 per million input tokens and $20 per million output tokens, down from $5 and $25 for Opus 5. The company says it matches Claude Fable 5.1 on most tasks, uses fewer tokens, and generates output more than 30 percent faster, with operating cost about 40 percent lower than Opus 5. Published scores include 66.4 percent on Terminal-Bench 4.0 and 54.4 percent on FrontierCode v1.1, ahead of Fable 5.1 on those tests. Cybersecurity, biology, and frontier-development safeguards can route flagged requests to other models; Sonnet 5.5 and Haiku 5.5 are expected in the coming weeks.
- Input and output prices are $4 and $20 per million tokens.
- Anthropic claims about 40 percent lower operating cost than Opus 5.
- Terminal-Bench 4.0 score is 66.4 percent, above Fable 5.1.
- Cyber, biology, and frontier requests can be routed to other models.
- API model ID is claude-opus-5-5 on AWS, Google Cloud, and Azure.
From the original article
4 min read at the-decoder.com
Anthropic is launching Claude Opus 5. 5, the first model in a new generation. The company says it matches Claude Fable 5.
By Matthias Bastian · the-decoder.com
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