OpenAI has introduced GPT-5.6 Sol, the flagship model in its new GPT-5.6 family alongside Terra and Luna. Sol is designed for demanding workloads including software engineering, scientific research, cybersecurity, and long-running agentic tasks.
The model adds advanced reasoning modes, including Max for deeper reasoning and Ultra for coordinated sub-agent execution on highly complex problems. OpenAI says GPT-5.6 Sol delivers stronger performance while using tokens more efficiently and is backed by expanded safety evaluations and deployment safeguards.
The model is currently available in a limited preview through the API and Codex, with broader availability planned in the coming weeks.
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