Head-to-head · OpenAI vs OpenAI
GPT-6 Astra vs GPT-6 Luna
Quick answer: GPT-6 Astra stands out for highest capability OpenAI offers. GPT-6 Luna stands out for extremely cheap for bulk processing. Reviewed September 2026.
Overview
GPT-6 Astra: GPT-6 Astra, released by OpenAI on 3 September 2026, is the company's most capable model to date, with state-of-the-art results on computer use, coding, cybersecurity and science. It sits at the top of the GPT-6 family in both capability and price.
GPT-6 Luna: GPT-6 Luna, launched on 22 September 2026, is the small, low-cost member of the GPT-6 family at $0.10 and $0.50 per million tokens. It targets high-volume tasks where cost and speed matter most.
At a glance
| Dimension | GPT-6 Astra | GPT-6 Luna |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Starting price | API: $10 in / $50 out per M tokens | API: $0.10 in / $0.50 out per M tokens |
| Pricing model | Paid | Paid |
| Free tier | No | No |
| Category | Generative AI | Generative AI |
Strengths and limits
GPT-6 Astra
- Highest capability OpenAI offers
- Broad strength across coding and agentic work
- Large ecosystem of tools and integrations
Watch out for
- $10 input and $50 output per million tokens
- GPT-6 Sol is far cheaper for most work
- Very new, so long-term evaluations are limited
GPT-6 Luna
- Extremely cheap for bulk processing
- Fast responses
- Good fit for classification and extraction
Watch out for
- Not suited to the hardest reasoning tasks
- Newest release with limited track record
- Quality varies by task, so test on your own data
Key features
GPT-6 Astra
- Top of the GPT-6 family for capability
- Strong computer use and coding performance
- Advanced cybersecurity and science reasoning
- Available through the OpenAI API
GPT-6 Luna
- Very low per-token pricing
- Built for high-volume and latency-sensitive work
- Shares GPT-6 family technology
- Available through the OpenAI API
Pricing compared
GPT-6 Astra is priced by usage rather than by seat: API: $10 in / $50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
GPT-6 Luna is priced by usage rather than by seat: API: $0.10 in / $0.50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Frequently asked questions
Which is better, GPT-6 Astra or GPT-6 Luna?
It depends on the work. GPT-6 Astra stands out for highest capability OpenAI offers. GPT-6 Luna stands out for extremely cheap for bulk processing.
How do GPT-6 Astra and GPT-6 Luna compare on price?
GPT-6 Astra is priced by usage rather than by seat: API: $10 in / $50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing. GPT-6 Luna is priced by usage rather than by seat: API: $0.10 in / $0.50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Is there a free option between GPT-6 Astra and GPT-6 Luna?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.