OpenAI has not publicly confirmed a model called “GPT-6” as the next flagship in the sense of a future unreleased model. What is confirmed is that 
OpenAI has published an official GPT-6 family with a flagship called GPT-6 Astra, plus GPT-6 Sol, GPT-6 Luna, and a later GPT-6.1 Sol update.
1) Is it called GPT-6?
Confirmed as the family/generation name: 
OpenAI’s official pages use GPT-6 for the model family, with Astra as the flagship name.
What is still not fully settled publicly is whether people should think of “GPT-6” as a single base model name versus a family label, because 
OpenAI presents it as a tiered family rather than one monolithic release.
2) Release timing
OpenAI has already:
- Announced GPT-6 Astra
- Made it available in ChatGPT for eligible users
- Made it available via the API
The public record also shows later family additions:
- GPT-6 Sol and GPT-6 Luna
- GPT-6.1 Sol later in September 2026
So this is not just an announcement-only model; it is already in public availability, though access varies by product and plan.
3) Model variants
Confirmed variants in the official OpenAI material:
- GPT-6 Astra — flagship
- GPT-6 Sol — higher-capability, lower-cost tier
- GPT-6 Luna — fastest / lowest-cost tier
- GPT-6.1 Sol — later update to Sol
There is also a ChatGPT product label such as GPT-6 Pro tied to Astra in some plans, which appears to be a product/access naming layer rather than a separate base model.
4) Benchmarks
OpenAI’s own pages report headline benchmark numbers for Astra, including:
- FrontierMath Tier 4: 98%
- ARC-AGI-3: 99.9%
- ExploitBench: 100%
- Additional reported results on tasks like science, browsing, software engineering, and computer use
Important caveat: these are OpenAI-reported benchmark claims, not independently verified measurements.
5) Pricing
Confirmed official API pricing is published for the family:
- GPT-6 Astra: $10 / 1M input tokens, $50 / 1M output tokens
- GPT-6 Sol: $2 / 1M input tokens, $10 / 1M output tokens
- GPT-6 Luna: $0.10 / 1M input tokens, $0.50 / 1M output tokens
For GPT-6.1 Sol, I did not find a clearly published official token price in the material reviewed, so I would treat precise pricing for that sub-variant as not fully confirmed unless OpenAI has a dedicated pricing page or model card.
Bottom line
- GPT-6 is confirmed as OpenAI’s current flagship family name.
- GPT-6 Astra is the flagship model.
- Release timing has already passed: it is announced and available.
- Variants are confirmed: Astra, Sol, Luna, and GPT-6.1 Sol.
- Benchmark claims are published by OpenAI, but remain company-reported.
- Pricing is officially listed for Astra, Sol, and Luna; GPT-6.1 Sol pricing is less clear from the sources reviewed.
