On the Responses API, whether earlier turns' reasoning items get rendered into the next sample is the model's default unless you say otherwise — so a multi-turn agent can silently re-derive conclusions it already reached and billed you for. `reasoning.context: "all_turns"` retains them. Switch back to `current_turn` the moment that reasoning goes stale.
Set reasoning.context to all_turns So Your Agent Stops Re-Deriving Chains of Thought You Already Bought
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