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PR #2306 by pcbeingused333: fix(anthropic): don't send thinking.type=disabled to models that reject it
Fixed an Anthropic provider issue where --thinking=off sent thinking.type=disabled to models that reject it (Opus 5.5, Sonnet 5.5, Fable 5/5.1, and the Mythos models), causing 400 errors.
Replaced the unsupported setting with thinking.type=between_tools for Sonnet 5.5 and adaptive thinking at low effort for models that cannot disable thinking entirely.