LLM
GPT-5.6 (Sol / Terra / Luna) Review
OpenAI · LLM
OpenAI previewed the GPT-5.6 family (Sol, Terra, Luna) on June 26, 2026 but gated it behind a US-government access list of roughly 20 organizations. When b
OpenAI previewed the GPT-5.6 family (Sol, Terra, Luna) on June 26, 2026 but gated it behind a US-government access list of roughly 20 organizations. When broadly available it's expected to be OpenAI's strongest offering across reasoning, code, and multimodal tasks. Runs on OpenAI's new custom Jalapeño inference chip for lower latency.
Pros
- Frontier reasoning capability
- Runs on custom Jalapeño chip (fast)
- Best multimodal in preview tests
- Strong on math and hard science
Cons
- US-gov access list only (currently ~20 orgs)
- No general public availability yet
- Enterprise pricing
Use cases
- Enterprise AI research
- National security applications
- Deep reasoning tasks
- Scientific research
Pricing
enterprise — from Contact sales. No free tier.