GPT-5.4 Thinking, rolled out in early March 2026, surfaces its plan before executing it — so users can redirect the model before it commits to an approach.
Configurable Reasoning Effort
The API-level reasoning_effort parameter gives product teams genuine control over cost-quality tradeoffs. For a customer-facing chatbot, low keeps latency manageable. For a background research agent, high delivers materially better results.
reasoning_effort: "low" | "medium" | "high" in your completions request. Planning tokens are billed at 60% of output token rate.The surfaced reasoning plan can also be captured as an audit trail — useful in regulated industries where AI decision transparency is becoming a compliance requirement.
Our AI automation practice has already begun evaluating GPT-5.4 Thinking for research and analysis workflows. Hrishikesh Baidya notes the configurable effort parameter aligns well with tiered task architectures we design for clients.
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