GPT-5.6: Frontier intelligence that scales with your ambition

OpenAI announced the general availability release of the GPT-5.6 family of models on July 9, 2026. The release includes Sol, Terra, and Luna models. OpenAI said GPT-5.6 Sol achieves state-of-the-art results across coding, knowledge work, cybersecurity, and science while using fewer tokens and at lower estimated cost than previous and competing frontier models. The company introduced ultra as a highest-capability setting that coordinates multiple agents across parallel workstreams to finish complex tasks faster. OpenAI stated that GPT-5.6 Sol sets a new high of 53.6 on Agents' Last Exam, eclipsing Claude Fable 5