GPT-5.6 Sol starts with a restricted preview
OpenAI’s GPT-5.6 family is described as three models: Sol, Terra, and Luna. Sol is the strongest model and is aimed at coding, , biology, and long-running AI tasks. Terra is positioned as a balanced model for performance and cost, while Luna is meant for fast, high-volume use.
The release is not a full public rollout at first. Access begins as a for vetted partners, after a request from the U.S. government.
The move follows wider concern around powerful AI models, including limits placed on Anthropic’s Fable 5 and Mythos 5 because of risks. OpenAI says GPT-5.6 did not cross its internal threshold for dangerous cyber capability and was tested with more than 700,000 GPU hours plus outside evaluations. Broader access may arrive in the coming weeks, but the exact public release timing remains uncertain.
Key points
- GPT-5.6 is described as a three-model family: Sol, Terra, and Luna.
- Sol is the aimed at hard work such as coding and .
- The first rollout is a , not open access for everyone.
- Government review and safety concerns are now shaping access to .
- s should wait for confirmed access, pricing, and limits before rebuilding workflows around GPT-5.6.
Sources covering this story (24)
- r/OpenAIGPT-5.6 Sol starts with a restricted preview ↗
- r/OpenAIDuring safety testing, GPT-5.6 Sol cheated so much METR was not able to evaluate it ↗
- r/OpenAIMETR warns AIs now may have the "means, motive, and opportunity" to escape into the wild ↗
- r/OpenAIGpt 5.6 sol appearing in codex ↗
- r/OpenAILook at that !! Scientist early tester on GPT-5.6 Sol ↗
- r/ClaudeAIThey must to switch between fable and gpt 5.6 ↗
- r/ClaudeAIScoop: Powerful Anthropic model, Fable 5, on track to return soon ↗
- r/OpenAIPeople keep talking about Fable 5 ban and now GPT 5.6 not being released to masses, but do you guys think if AGI is ever reached, any government would allow unrestricted access to everyone? ↗
- r/OpenAI