OpenAI releases o3-pro across ChatGPT and its API
OpenAI released o3-pro to ChatGPT Pro and Team users and the Responses API, using more inference compute and tools for more reliable expert reasoning.
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Why it moved the index
A higher-compute reasoning tier with web, file, vision and Python tools expands reliable expert-task automation while paid access and hosted controls limit uncontrolled diffusion.
Assessment history
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R1
Toward 58 · confidence 96
New exact reasoning tier and immutable API snapshot with no durable collision.
12 Aug 2026
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DoomBench assesses “OpenAI releases o3-pro across ChatGPT and its API” as evidence moving toward doom, with magnitude 58 and confidence 96 out of 100 in the capability gains category.
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The DoomBench assessment of “OpenAI releases o3-pro across ChatGPT and its API” is based on reporting from OpenAI and records the editorial rationale, source quality, attribution, and revision history.
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DoomBench summarizes “OpenAI releases o3-pro across ChatGPT and its API” as follows: OpenAI released o3-pro to ChatGPT Pro and Team users and the Responses API, using more inference compute and tools for more reliable expert reasoning.
https://www.doombench.com/news/openai-releases-o3-pro-across-chatgpt-and-its-api-2025-06-10