Model · Multimodal language model
GPT-5.5 Pro
The highest-accuracy GPT-5.5 tier, served as a dated snapshot and alias through OpenAI's managed developer API with extra test-time compute for precision-heavy reasoning and coding, without downloadable model weights.
- Developer
- OpenAI
- Distribution
- Developer API
- 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 Pro release whose API page identifies gpt-5.5-pro-2026-04-23 as the fixed default snapshot behind the gpt-5.5-pro alias, served via the Responses API. The base GPT-5.5 release, the GPT-5.5 Instant tier, the invite-only Cyber preview, ChatGPT and Codex applications, Azure Foundry (which lists no gpt-5.5-pro row), fine-tuned derivatives, and later GPT releases are separate service, application, or model boundaries.
Risk statements
The developer publishes no risk-threshold statement for this release. Absence is not evidence of safety.
Page the reviewer checked ↗ · 2026-10-09 · Research confidence: Low
Open in the directory → Open official model page ↗
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