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Large Language ModelsLessWrong AIPublished: Jul 29, 2026, 10:00 JST

Claude Opus 5 launches as cheaper Fable alternative, not frontier model

Claude Opus 5 launches as cheaper Fable alternative, not frontier model

Anthropic released Claude Opus 5, positioned not as the most advanced AI model but as a lower-cost alternative to Fable that matches its performance at half the price per token via API and significantly cheaper through subscriptions, with more permissive content policies.

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