OpenAI Releases GPT-5.6 (Sol, Terra, Luna): A Three-Tier Model Family With Programmatic Tool Calling in the Responses API

OpenAI launched GPT-5.6 with three pricing tiers (Sol, Terra, Luna) featuring Programmatic Tool Calling that executes model-written JavaScript in isolated environments for autonomous tool orchestration. This advancement positions OpenAI ahead of competitors on coding benchmarks while offering developers more efficient and autonomous AI capabilities at various price points.