Model · Multimodal language model
GPT-5.6 Luna
The cost-efficient GPT-5.6 tier for high-volume work, exposed as the gpt-5.6-luna tier name over OpenAI's managed developer API and Azure Foundry with no documented fixed dated snapshot and no downloadable 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-5.6 Luna tier launched July 9, 2026: the official model page lists both the default snapshot and the snapshot inventory as gpt-5.6-luna with no documented fixed dated snapshot, so applications cannot pin a dated revision; OpenAI defines the tiers as durable capabilities that advance on their own cadence. The Sol and Terra sibling tiers, ChatGPT and Codex application surfaces, fine-tuned derivatives, and later generations are separate service, application, or model boundaries.
Risk statements
“High” · Precautionary
Under our Preparedness Framework, we are treating Sol, Terra and Luna as High capability in both Cybersecurity and Biological and Chemical risk.
- Risk areas
- Cyber · Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: High
OpenAI names this release against “High” in cyber and biological or chemical 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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