OpenAI previewed its three-model GPT-5.6 family Friday, pairing sharp gains in coding, biology and cybersecurity with access limited for now to a small circle of partners. GPT-5.6 arrives as a three-tier family, with Sol as the flagship, Terra as a balanced option and Luna built for speed. New max and ultra modes let Sol reason longer and split hard tasks across parallel subagents. OpenAI rates all three tiers high risk for cyber and biology, keeping wide access on hold. The company unveiled Sol as its strongest model yet, Terra as a balanced everyday tier priced at roughly half its predecessor, and Luna as the fastest option at $1 per million input tokens. OpenAI also plans to run Sol on Cerebras chips at up to 750 tokens per second in July. Sol set a new high mark on Terminal-Bench 2.1, and in genomics analysis, it edged past GPT-5.5 while spending fewer tokens. On one exploit benchmark, Sol matched Anthropic's Mythos Preview using roughly a third of the output tokens. OpenAI classified all three models as high risk for both cyber and biological misuse, a first for its smaller, cheaper tiers. Roughly 20 organizations cleared by the government can run the models during the preview, with a wider rollout to ChatGPT, Codex and the API promised within weeks. Security researcher Alex Stamos warned that walling off frontier tools could hand rivals abroad an edge in the AI race. For GPT-5.6