Head-to-head · OpenAI vs OpenAI
GPT-6 Luna vs GPT-6 Sol
Quick answer: GPT-6 Luna stands out for extremely cheap for bulk processing. GPT-6 Sol stands out for strong balance of quality and cost. Reviewed September 2026.
Overview
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.
GPT-6 Sol: GPT-6 Sol, launched on 22 September 2026, brings GPT-6 Astra's technology to a faster, cheaper model at $2 and $10 per million tokens. OpenAI states these are permanent prices, not promotional rates.
At a glance
| Dimension | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Starting price | API: $0.10 in / $0.50 out per M tokens | API: $2 in / $10 out per M tokens |
| Pricing model | Paid | Paid |
| Free tier | No | No |
| Category | Generative AI | Generative AI |
Strengths and limits
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
GPT-6 Sol
- Strong balance of quality and cost
- Price is permanent, not introductory
- Good default for production workloads
Watch out for
- Below Astra on the hardest tasks
- Newest release with limited track record
- Competes closely with Claude Sonnet 5 on price
Key features
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
GPT-6 Sol
- Built on GPT-6 Astra technology
- Permanent $2 and $10 per million token pricing
- Faster responses than Astra
- Available through the OpenAI API
Pricing compared
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.
GPT-6 Sol is priced by usage rather than by seat: API: $2 in / $10 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 Luna or GPT-6 Sol?
It depends on the work. GPT-6 Luna stands out for extremely cheap for bulk processing. GPT-6 Sol stands out for strong balance of quality and cost.
How do GPT-6 Luna and GPT-6 Sol compare on price?
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. GPT-6 Sol is priced by usage rather than by seat: API: $2 in / $10 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 Luna and GPT-6 Sol?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.