OpenAI Releases GPT-5.6 (Sol, Terra, Luna): A Three-Tier Model Family With Programmatic Tool Calling in the Responses API
Interactive · OpenAI GPT‑5.6 · July 9, 2026 GPT‑5.6 tier, cost and benchmark explorer Every number below is taken from OpenAI’s published GPT‑5.6 eval tables and price list. Move the controls to see how tier choice changes spend and score. Three durable capability tiers The number is the generation. Sol, Terra and Luna are tiers…