What Is GPT-5.6? OpenAI's Sol, Terra, and Luna Model Tiers Explained

GPT-5.6 launches with three tiers: Sol (frontier), Terra (mid), and Luna (small). Learn how they compare to Claude Fable 5 on benchmarks and pricing.

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GPT-5.6 includes Sol, Terra, Luna, and ultra tiers with varied pricing and capabilities.

More intelligence from every token, stronger performance per dollar, and more capability on demand for your hardest work.

More intelligence from every token, stronger performance per dollar, and more capability on demand for your hardest work.

More intelligence from every token, stronger performance per dollar, and more capability on demand for your hardest work.

OpenAI’s GPT-5.6 family includes capability tiers: Sol as the flagship model, Terra as the lower-cost option, and Luna as the fastest, lowes

OpenAI’s GPT-5.6 family includes capability tiers: Sol as the flagship model, Terra as the lower-cost option, and Luna as the fastest, lowes

OpenAI’s GPT-5.6 ships as three models—Sol, Terra, and Luna. Here’s the pricing breakdown, programmatic tool calling, and how to pick the ri

OpenAI announces the release of its new GPT-5.6 family of models: Sol, Terra, and Luna, already being tested for diverse applications.

Sam Altman called GPT-5.6 OpenAI's best model as the company pushes developers toward agentic work priced by capability tier.

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