OpenAI released a comprehensive guide for its GPT-6 model family on October 2, 2026. The document is designed to assist developers and startups in selecting appropriate models, managing reasoning efforts, and transitioning workflows from prototypes to production environments.
The lineup includes the flagship model Astra, launched on September 3, 2026, which achieved a 98% score on FrontierMath Tier 4 and 99.9% on ARC-AGI-3. The Sol and Luna models, released on September 22, 2026, offer API rates 50% lower than the previous GPT-5.6 generation.
Pricing for Sol is set at $2 per million input tokens and $10 per million output tokens. Luna is priced at $0.10 per million input tokens and $0.50 per million output tokens. The 6.1 Sol model, released on September 29, 2026, provides performance comparable to Astra at one-fifth of the cost.
All models in the GPT-6 family feature a context window of 1.05 million tokens and a maximum output of 128,000 tokens. The guide also details technical features such as asynchronous tool calling, enhanced caching, and adjustable reasoning effort to support efficient deployment.
