AnthropicHow-ToAI ModelsNovember 10, 2026

Anthropic guide maps Claude lineup: Fable 5.2, Opus 5.5, Sonnet 5.5, Haiku 5.5

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Anthropic recommends starting most work on Opus 5.5 at its default medium effort level, noting it costs half as much per input and output token as Fable 5.2. The guide says to adjust effort level before switching models, and to save cost by putting subagents on smaller models.

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