GPT-5.6
A new standard for intelligence and efficiency
In plain words
GPT-5.6 is a family of AI models available through an API, offering three options: Sol for complex agentic tasks, Terra for balanced general use, and Luna for speed and cost-effectiveness. The models feature Programmatic Tool Calling, Multi-agent capabilities in beta for parallel execution, and explicit prompt caching. GPT-5.6 is designed for developers and builders who need variable intelligence levels across different workflow demands.
written from the facts on this page · September 2026
From the sources
GPT-5.6 is rolling out in the API! Our new family of models gives builders three options: Sol (our flagship model for the hardest agentic tasks), Terra (balanced for everyday workflows), and Luna (fast and cost-efficient). GPT-5.6 also introduces Programmatic Tool Calling, Multi-agent (beta) for parallel execution, and explicit prompt caching. On July 23, we're teaming up with Product Hunt for OpenAI Day. The top five launches will each receive $10K in API credits.
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