Expired50% confidenceFactTime unknown
GPT-5.6 introduced an 'UltraFast' mode with inference speed improved by 2 to 3 times
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
GPT-5.6 Internal Testing Begins: A Complete Breakdown of the Week's Biggest AI Developments
bilibili竹言见智
Related Claims
UnverifiedGPT-4o achieves approximately a 2x improvement in inference speed compared to GPT-4 Turbo.81% similarUnverifiedGPT-5.6 introduces Max reasoning intensity and Ultra mode, and expands the context window from 1 million to 1.5 million tokens, a 43% increase.80% 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.79% similarUnverifiedThe publicly released code optimized by GPT-5.2 achieved 1,525 computation cycles, representing approximately a 97x performance speedup relative to the baseline.79% similar
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