GPT-5.6 Terra speeds ClawSweeper by 40%

Selecting mid-tier reasoning configurations is often superior to using the absolute highest-tier modes for real-world developer agent tasks.

• –A 40% speedup combined with massive cost reductions confirms that the 'high' setting on GPT-5.6 Terra is a sweet spot for production code review tasks.
• –Diminishing returns hit hard at the extreme reasoning end; the 'xhigh' mode adds latency and cost without showing any measurable improvement in review evaluations.
• –This suggests that developers should systematically benchmark intermediate reasoning settings rather than defaulting to maximum reasoning or flagship models.