OpenAI releases GPT-4.5 Preview to users and developers
OpenAI released GPT-4.5 Preview, its largest GPT chat model at the time, to Pro users and developers worldwide after scaling unsupervised pretraining and post-training on Azure supercomputers.
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Why it moved the index
GPT-4.5 advanced broad knowledge, instruction following and scaled pretraining while reaching global paid users and APIs. It was less reasoning-focused than o-series models, and research-preview access constrains the deployment assessment.
Assessment history
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R1
Toward 62 · confidence 97
New February 2025 exact model release with no durable identity or event collision.
12 Aug 2026
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DoomBench assesses “OpenAI releases GPT-4.5 Preview to users and developers” as evidence moving toward doom, with magnitude 62 and confidence 97 out of 100 in the capability gains category.
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The DoomBench assessment of “OpenAI releases GPT-4.5 Preview to users and developers” 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 GPT-4.5 Preview to users and developers” as follows: OpenAI released GPT-4.5 Preview, its largest GPT chat model at the time, to Pro users and developers worldwide after scaling unsupervised...
https://www.doombench.com/news/openai-releases-gpt-4-5-preview-to-users-and-developers-2025-02-27