PRODUCTION SCENARIO
Halloway Legal runs contract redlining on gpt-5.6-sol. A small set of unusual indemnity clauses is handled poorly while the other 95% of contracts are fine. No response comes back incomplete. The team has already raised reasoning.effort to max on that set with no improvement, and can tolerate slower answers there.
Which change targets the hard cases?
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Answer: Set reasoning.mode to pro on the requests carrying the unusual indemnity clauses
GPT-5.6 models support standard and pro reasoning modes on the Responses API, and pro is the documented lever for difficult tasks that need more model work and can tolerate higher latency and token usage once the effort ladder is exhausted. max_output_tokens is a ceiling on total generation including reasoning tokens, so raising a limit nothing is hitting changes nothing when no response comes back incomplete. A second self-review pass repeats the same reasoning depth at twice the cost, and a fine-tune of a smaller model teaches format and behaviour rather than harder reasoning.
Official Source: https://developers.openai.com/api/docs/guides/reasoning ↗