Model · Multimodal language model
GPT-6 Luna
The efficient GPT-6 tier released September 22, 2026 for focused, high-volume tasks, exposed as the gpt-6-luna name over OpenAI's managed developer API and Azure Foundry with no documented fixed dated snapshot on OpenAI's page 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-6 Luna release of September 22, 2026 as exposed under the gpt-6-luna name: OpenAI's model page lists the default snapshot and the snapshot inventory as gpt-6-luna with no dated snapshot, so applications cannot pin a dated revision through OpenAI, although Azure Foundry documents the version as gpt-6-luna (2026-09-22). OpenAI changed the name in place on September 25, 2026 (an image-encoding fix). The GPT-5.6 Luna tier, GPT-6 Sol, GPT-6.1 Sol and GPT-6 Astra, ChatGPT and Codex surfaces, the Decisions API that OpenAI released with this model, fine-tuned derivatives, and later generations are separate service, application, or model boundaries.
Risk statements
“High” · Precautionary
Under our Preparedness Framework, we are treating GPT-6 Sol and GPT-6 Luna as High capability in both Cybersecurity and Biological and Chemical domains.
- 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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