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Large Language ModelsAI Safety & AlignmentLessWrong AIPublished: Jul 26, 2026, 04:00 JST1 min read

Claude Opus 5 balances speed and capability at half the price of Fable 5

Claude Opus 5 balances speed and capability at half the price of Fable 5

Anthropic released Claude Opus 5, which matches or exceeds Fable 5's performance on many practical tasks while running faster and costing half as much. The model shows substantial improvements over Claude Opus 4.8, particularly in agentic coding, computer use, and long-horizon knowledge work, and reaches state-of-the-art performance on several third-party benchmarks.

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