GPT-4.5 Preview
READER SUMMARYOpenAI's largest GPT chat model at launch, released as a global research preview with broader knowledge, improved intent following and scaled pretraining rather than o-series reasoning.
Why this model scores 69.6
Broad knowledge and scaled pretraining lift capability, but the model lacks the deliberate reasoning and agentic emphasis of o-series releases. Pro and developer preview access makes deployment substantial but bounded. Hosted controls constrain control difficulty despite broad generative misuse potential.
0 comments · 0 votes
Sign in to join the discussion →
No comments yet. Start the discussion.
News tied to GPT-4.5 Preview
The model score of 69.6 rates this model's risk profile. The overall Doom Index of 63.2 measures the recalibrated complete evidence corpus. These values answer different questions.
Each article's leave-one-out Doom Index contribution is divided equally among the exact models named on that article. This prevents multi-model evidence from being claimed in full on several model pages. Model risk scores are recalculated from their technical profile and related news, but never feed back into the overall index.
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.
- Full item contribution
- +0.03
- GPT-4.5 Preview equal share
- +0.03
Model score history
- R1Doom Score 69.6
Initial exact profile for the February 2025 GPT-4.5 research-preview release.
12 Aug 2026