OpenAI announces GPT‑5.6 Sol, its next-generation flagship model beating Claude Mythos 5

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Summary

OpenAI has announced GPT-5.6, a new model family that includes Sol, Terra, and Luna. The flagship Sol model targets demanding reasoning and agentic coding workloads and now tops a benchmark previously led by Anthropic’s Claude Mythos 5. OpenAI says the release starts as a limited preview for trusted partners because of U.S. government restrictions, with broader access planned in ChatGPT, Codex, and the API in the coming weeks. The launch also adds new reasoning modes, stronger safety protections, and updated caching and pricing options for developers.

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