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Claude Opus 5.5 matches Fable 5.1 performance at lower cost and promises less "Claudish" writing
The Decoder·September 22, 2026·1 min read
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Anthropic is launching Claude Opus 5. 5, the first model in a new generation.
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Anthropic is launching Claude Opus 5.5, the first model in a new generation. The company says it matches Claude Fable 5.1 on most tasks while costing about 40 percent less to run than Opus 5. Anthropic's benchmarks also put it ahead of OpenAI's GPT-6 Astra on most tasks, despite being significantly cheaper. Sonnet 5.5 and Haiku 5.5 are expected in the coming weeks. The article Claude Opus 5.5 matches Fable 5.1 performance at lower cost and promises less "Claudish" writing appeared first on The D
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