Three-tier frontier model family comprising Sol, Terra, and Luna.
- Jul 9, 2026
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Models in this family
| Model | Family | Released | Modality | Open source | API | Status |
|---|---|---|---|---|---|---|
 GPT-5.6 Luna | GPT-5.6 | Jul 9, 2026 | — | — | — | active |
| GPT-5.6 Sol | GPT-5.6 | Jul 9, 2026 | — | — | — | active |
| GPT-5.6 Terra | GPT-5.6 | Jul 9, 2026 | — | — | — | active |
Releases
Aug 21, 2026GPT-5.6 API pricing temporarily reducedPricing change
OpenAI reduced GPT-5.6 Sol API and credit pricing by more than 20% for three months, following earlier reductions for Terra and Luna.
Jul 9, 2026GPT-5.6 model family became generally availableModel release
OpenAI launched GPT-5.6 Sol, Terra, and Luna broadly across ChatGPT, Codex, and the API.