Last month, OpenAI announced a limited preview of its new GPT-5.6 model series, which includes the Sol, Terra, and Luna models. Due to U.S. government restrictions, the GPT-5.6 series was limited to a small group of trusted partners.
GPT-5.6 Sol is the flagship model for complex reasoning and agentic workloads, while GPT-5.6 Terra is a balanced model with performance competitive with GPT-5.5 at half the cost. The smallest and most cost-efficient model in the series is GPT-5.6 Luna.
Today, OpenAI announced that all three models, GPT-5.6 Sol, Terra, and Luna, will be publicly available for everyone starting Thursday, July 9th. Also, the preview access is now available globally to all. The U.S. Department of Commerce has given its approval to OpenAI for a broad launch of the GPT-5.6 series after additional testing and meetings with government agencies.
GPT-5.6 sol launches thursday!
— Sam Altman (@sama) July 8, 2026
happy building
GPT-5.6 Pricing:
- GPT-5.6 Sol: $5 per million input tokens and $30 per million output tokens
- GPT-5.6 Sol Fast mode (with up to 750 tokens per second): $12.5 per million input tokens and $75 per million output tokens
- GPT-5.6 Terra: $2.5 per million input tokens and $15 per million output tokens
- GPT-5.6 Luna: $1 per million input tokens and $6 per million output tokens
To further reduce token usage for the GPT-5.6 series models, OpenAI has introduced more predictable prompt caching, including support for explicit cache breakpoints and a 30-minute minimum cache life.
Anticipating the GPT-5.6 series launch, in order to maintain mindshare with developers, Anthropic today announced that it is expanding promotional access to Claude Fable 5. During the promotional period, users can use Claude Fable 5 for up to 50% of their weekly subscription limits at no extra cost. After reaching that limit, users can continue using Fable 5 with usage credits.