GPT-5.6: Frontier intelligence that scales with your ambition

OpenAI launches the GPT-5.6 family for general availability: the flagship Sol, the balanced Terra, and the cost-efficient Luna. The release centers on efficiency, extracting more intelligence per token so models reach frontier scores at lower estimated cost and latency, and adds two ways to scale effort on demand: a `max` reasoning setting and an `ultra` mode that coordinates multiple agents in parallel. GPT-5.6 also ships OpenAI's most extensive safety evaluation and layered safeguard stack to date.