Expired50% confidenceFactExact time
GPT 5.6 has added an Ultra thinking tier; previously the maximum thinking intensity in Codex could only be set to Extra High.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/12/2026
First Seen
Valid until: 10/10/2026(expired)
Sources
GPT 5.6+Codex深度实测：三档模型与Ultra模式全解析
bilibilioil欧呦7/10/2026
Related Claims
UnverifiedEach GPT-5.6 model can be configured with different thinking intensities, with the highest level being Ultra.83% similarUnverifiedGPT-5.6 adds two higher levels, Max and Ultra, on top of the original four thinking intensity levels of Low, Medium, High, and X-High.83% 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.77% similarUnverifiedGPT-5.6 introduces a Max Reasoning mode, similar to Claude's Deep Thinking mode.77% similar
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