Summary
OpenAI made its GPT-5.6 family generally available on July 9, 2026, opening the flagship Sol, balanced Terra, and cost-efficient Luna tiers to all customers after a June 26 gated preview and a U.S. government safety review. Published pricing runs $5/$30 (Sol), $2.50/$15 (Terra), and $1/$6 (Luna) per million input/output tokens.
What changed
GPT-5.6 progressed from a June 26 preview limited to about 20 partner organizations to general availability across ChatGPT and the API on July 9, 2026, after clearing a government safety review; each tier now has published per-token pricing.
Why it matters
GA with concrete tiered pricing turns GPT-5.6 from a gated preview into a buildable platform, letting coding tools and agent platforms standardize on Sol, Terra, and Luna and resetting the per-token benchmarks rivals are measured against. The cleared government review also normalizes safety-gated staged releases for frontier models.
Evidence excerpt
OpenAI made all three tiers - Sol, Terra and Luna - generally available on July 9, 2026 ... Sol is $5 input / $30 output; Terra is $2.50 input / $15 output; and Luna is $1 input / $6 output.