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Anthropic released Claude Opus 5.5, a new flagship model it says matches the performance of Claude Fable 5.1 on most tasks while costing substantially less to run. On Anthropic’s published benchmarks Opus 5.5 outperforms Fable 5.1 and Opus 5 in several coding and knowledge-work tests, though OpenAI’s GPT-6 Astra still leads on two benchmarks measuring automation and scientific agentic work.
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