Model · Multimodal language model
GPT-5.5
A text-and-image model release exposed as a dated snapshot and alias through OpenAI's managed developer API and Azure Foundry, without downloadable model weights.
- Developer
- OpenAI
- Distribution
- Developer API · Third-party hosting
- Artifact licensing
- Proprietary access
- License scope
- Reviewed release artifacts and mandatory terms; not an assessment of training code or training data openness.
- Licenses
- OpenAI Services Agreement
- Boundary
- This record represents the GPT-5.5 release whose API page identifies gpt-5.5-2026-04-23 as the fixed default snapshot behind the gpt-5.5 alias. The OpenAI API platform, Azure Foundry hosting of the same snapshot, ChatGPT, GPT-5.5 Thinking, the separate gpt-5.5-pro and gpt-5.5-instant variants, fine-tuned derivatives, and later GPT releases are separate service, application, or model boundaries.
Risk statements
“High capability” · Precautionary
As we did for GPT-5.4 Thinking before it, we are continuing to treat GPT-5.5 as High capability in the Biological and Chemical domain. We have applied the corresponding safeguards for this model as described in the GPT-5 system card. As we did for GPT-5.3-Codex and GPT-5.4-thinking, we are treating GPT-5.5 as High capability in the Cybersecurity domain, but below Critical.
- Risk areas
- Biological or chemical · Cyber
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: High
OpenAI names this release against “High capability” in biological or chemical and cyber capability, as a precaution. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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