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Release 0.10.54: Claude Fable 5.2 - #1067
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Nov 10, 2026
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- Onboard claude-fable-5-2 (direct) and copilot.claude-fable-5.2 (Copilot); same request contract as Fable 5.1 (always-on adaptive thinking, sampling stripped, no forced tool choice, native JSON schema output).
- Aliases: fable/fable52 -> Fable 5.2; fable51 and fable5 pin older versions; copilot.fable, copilot.fable52 and cp.fable -> copilot.claude-fable-5.2.
- Copilot: Fable 5.1/5.2 use native JSON schema structured output (forced-tool fallback is rejected by the gateway for these models).
- Direct Anthropic: for models that bind thinking to the conversation prefix (Fable 5.1/5.2, Opus/Sonnet/Haiku 5.5), send thinking.block_binding.prefix_mismatch_behavior="drop_block" with the thinking-binding-controls-2026-08-01 beta, so mid-conversation tool changes (e.g. /connect) drop stale thinking instead of failing every later request. Stopgap until tools are frozen per conversation (tool_addition).
- Docs and generated references updated; live structured-output e2e covers Fable 5.2 (direct, Copilot) and Copilot Fable 5.1.
- Onboard claude-fable-5-2 (direct) and copilot.claude-fable-5.2 (Copilot); same request contract as Fable 5.1 (always-on adaptive thinking, sampling stripped, no forced tool choice, native JSON schema output). - Aliases: fable/fable52 -> Fable 5.2; fable51 and fable5 pin older versions; copilot.fable, copilot.fable52 and cp.fable -> copilot.claude-fable-5.2. - Copilot: Fable 5.1/5.2 use native JSON schema structured output (forced-tool fallback is rejected by the gateway for these models). - Direct Anthropic: for models that bind thinking to the conversation prefix (Fable 5.1/5.2, Opus/Sonnet/Haiku 5.5), send thinking.block_binding.prefix_mismatch_behavior="drop_block" with the thinking-binding-controls-2026-08-01 beta, so mid-conversation tool changes (e.g. /connect) drop stale thinking instead of failing every later request. Stopgap until tools are frozen per conversation (tool_addition). - Docs and generated references updated; live structured-output e2e covers Fable 5.2 (direct, Copilot) and Copilot Fable 5.1.
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