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On November 10, 2026, Claude Devs announced that Fable 5.2 is now available on Claude Platform and Claude Code. To prevent distillation, preserved thinking now covers all API accounts on Fable 5.2; editing prior context may return a 400, and the official recommendation is to use compaction, context editing, or mid-conversation system messages instead, which Claude Code, Managed Agents, and the Agent SDK handle automatically. In the same release, Fable 5.2 is up to 30% faster than Fable 5.1, priced at $8/$40 per 1M tokens, down from the previous $10/$50; a fast mode is also offered, with 2.5x output speed at double the price, set via "speed": "fast" in the API, and can be enabled in the model selector in Claude Code.
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Anthropic releases Fable 5.2 with 30% speed improvement and lower pricingDevelopments
1 confirmed developments
Anthropic extends preserved thinking to all Fable 5.2 API accounts
Source:Claude Devs
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Nov 10
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Anthropic releases Fable 5.2 with 30% speed improvement and lower pricing
Claude Devs announced that Fable 5.2 is now available on Claude Platform and Claude Code, up to 30% faster than Fable 5.1, priced at $8/$40 per 1M tokens, down from the previous $10/$50. To prevent distillation, preserved thinking now covers all API accounts on Fable 5.2; editing prior context may return a 400, and the official recommendation is to use compaction, context editing, or a mid-conversation system message instead—Claude Code, Managed Agents, and the Agent SDK handle this automatically. Fable 5.2 also offers a fast mode with 2.5x output speed at double the price; set "speed": "fast" in the API, and in Claude Code it can be enabled in the model selector.