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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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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM62confidence 97/100

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

  1. 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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  1. 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.

  2. 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.

  3. 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