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.
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.
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Assessment history
- R1Toward 62 · confidence 97
New February 2025 exact model release with no durable identity or event collision.
12 Aug 2026