OpenAI announces GPT‑5.6 Sol, its next-generation flagship model beating Claude Mythos 5
… Together, the GPT-5.6 family gives people and developers… pic.twitter.com/Wm7wF3abHN — OpenAI @OpenAI June 26, 2026 On the capability side, as expected, GPT-5.6 Sol is OpenAI’s strongest model yet. …