Quick answer
Use Sol for demanding everyday coding, Astra for maximum capability, and Luna for repeatable high-volume work.
- Astra
- $10 in / $50 out per MTok
- Sol
- $2 in / $10 out per MTok
- Luna
- $0.1 in / $0.5 out per MTok
- Verified
- September 23, 2026
01
Verified specs side by side
| Astra | Sol | Luna | |
|---|---|---|---|
| Base API price | $10 in / $50 out per MTok | $2 in / $10 out per MTok | $0.1 in / $0.5 out per MTok |
| Context / output | 1,050,000 tokens (128K max output) | 1,050,000 tokens (128K max output) | 1,050,000 tokens (128K max output) |
| Position | Highest capability | Complex reasoning | Efficient / high volume |
| Reasoning | low to max | none to max | none to max |
| Knowledge cutoff | Apr 30, 2026 | Apr 20, 2026 | May 18, 2026 |
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02
A practical routing rule
Start with Sol when the task is ambiguous or requires substantial reasoning. Use Luna after the workflow is well specified and repeatable. Escalate to Astra when a failed attempt costs more than its premium or when you explicitly need OpenAI's highest-capability tier.
03
Official sources
GPT-6 Astra, GPT-6 Sol, and GPT-6 Luna model documentation. Data verified September 23, 2026.