OpenAI GPT-4.5 System Card

OpenAI published the GPT-4.5 system card on Feb. 27, 2025 and set a deployment bar: post-mitigation risk must be no higher than Medium. The scorecard lists CBRN and persuasion as Medium, cybersecurity and model autonomy as Low; the post does not disclose benchmark scores, context window, or pricing. The key detail is the release condition, not the “largest model” claim: OpenAI says it found no significant safety-risk increase versus existing models.

Why it matters: This is the more useful GPT-4.5 companion doc: OpenAI states models can ship only if post-mitigation risk is Medium or below, with CBRN and Persuasion rated Medium. HKR-K is strong and HKR-R lands; HKR-H is weaker, and the card omits raw scores, context window, and pricing.