OpenAI · Shipped
GPT-5.6 Luna release date
Specs, benchmarks and changelog are on the GPT-5.6 Luna model card at TPS.
Released
Jul 9, 2026
What we know
Least capable of the three GPT-5.6 variants (Luna, Terra, Sol). Public release 2026-07-09; limited preview from 2026-06-26.
Spec
- Params
- Not stated
- Active
- Not stated
- Context
- Not stated
- Weights
- Closed
- Modality
- Not stated
- Codename
- Not stated
Every claim
4 from 2 sources- OpenAI NewsFrom the labSep 21
OpenAI's post names GPT-5.6 Luna as the model powering its V7 context product, but gives no release date.
- Simon WillisonSpotted in the wildSep 4
Author tested GPT-5.6 Luna in a pelican-generation comparison, indicating it was available by this date.
- OpenAI NewsFrom the labAug 19
GPT-5.6 Luna powers Replit's Free Mode for software creation.
- OpenAI NewsFrom the labAug 6
OpenAI has expanded access to GPT-5.6 Luna for free users with unlimited everyday chats.