🤖 fix: use effort param only for Claude Opus 4.5 #743
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The effort parameter is a new feature specific to Claude Opus 4.5. Other Anthropic models (Sonnet 4.5, Haiku 4.5, Opus 4.1, etc.) must use the thinking.budgetTokens approach for extended thinking. Changes: - Re-add ANTHROPIC_THINKING_BUDGETS for non-Opus 4.5 models - Update buildProviderOptions to detect Opus 4.5 and use effort param - Non-Opus 4.5 models use thinking.budgetTokens instead - Add unit tests for provider options builder - Add integration tests for reasoning with both Sonnet 4.5 and Opus 4.5 _Generated with `mux`_
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ammario
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Nov 25, 2025
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Summary
The
effortparameter is a new feature specific to Claude Opus 4.5 for controlling how much computational work the model applies to each task. Other Anthropic models (Sonnet 4.5, Haiku 4.5, Opus 4.1, etc.) must continue to use thethinking.budgetTokensapproach for extended thinking.Changes
ANTHROPIC_EFFORTmapping tothinking.tsfor Opus 4.5's effort levelsbuildProviderOptionsto detect Opus 4.5 and use theeffortparametercalculateEffectiveMaxOutputTokensto skip budget adjustment for Opus 4.5 (effort-based models don't need this)sendMessage.reasoning.test.ts) for reasoning with both Sonnet 4.5 and Opus 4.5Testing
bun test src/common/utils/ai/providerOptions.test.tsmake test(1199 pass)TEST_INTEGRATION=1)Generated with
mux