Unverified50% confidenceBenchmarkExact time
The full TwinCheck strategy improved the task success rate of the GPT-5.6 Sol model from 45.3% to 58.5%, with a 95% task bootstrap confidence interval of [8.2, 18.8].
1
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50%
Confidence
Long-term
Relevance
9/24/2026
First Seen
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UnverifiedGPT-5.6 Sol achieves 92.2% on the BrowseComp browsing task benchmark.77% similarUnverifiedOn performance model code construction tasks, GPT-5.6 Sol achieved a pass rate exceeding 80%.77% similarPartially VerifiedAll three GPT-5.6 models achieved a perfect score of 10 on the long-horizon agent fine-tuning task, while GPT-5.5 and Opus 4.7 could only score two or three points on that task.76% similarUnverifiedGPT-5.6 Sol achieved a score of 67.2% on CursorBench.75% similarUnverifiedIn OpenAI's internal benchmarks, GPT-5.6 Sol leads GPT-5.5 by approximately 16 points on recursive self-improvement (model improvement tasks), and shows a 31% improvement over 5.5 on AI infrastructure optimization (chip design workflows).74% similar
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