GPT-6 Sol vs GPT-6 Luna: API cost
Standard, cached and batch API prices for GPT-6 Sol (OpenAI) and GPT-6 Luna (OpenAI), and what each costs for your usage.
GPT-6 Luna is cheaper than GPT-6 Sol at standard rates, with 20× cheaper input and 20× cheaper output.
- Input $60.00
- Cached input $6.00
- Output $90.00
- Input $3.00
- Cached input $0.3
- Output $4.50
Show as a table
| Output tokens | GPT-6 Sol | GPT-6 Luna |
|---|---|---|
| 0 | $2.00 | $0.1 |
| 250 | $4.50 | $0.23 |
| 500 | $7.00 | $0.35 |
| 750 | $9.50 | $0.47 |
| 1,000 | $12.00 | $0.6 |
| Token type | GPT-6 Sol | GPT-6 Luna | |
|---|---|---|---|
| Input | $2 | $0.10 | GPT-6 Luna is 20× cheaper |
| Cached input | $0.20 | $0.01 | GPT-6 Luna is 20× cheaper |
| Output | $10 | $0.50 | GPT-6 Luna is 20× cheaper |
| Batch input | $1 | $0.05 | GPT-6 Luna is 20× cheaper |
| Batch cached input | $0.10 | $0.005 | GPT-6 Luna is 20× cheaper |
| Batch output | $5 | $0.25 | GPT-6 Luna is 20× cheaper |
GPT-6 Sol: Long prompts are billed at higher long-context rates.
GPT-6 Luna: Long prompts are billed at higher long-context rates.
| Workload | GPT-6 Sol | GPT-6 Luna |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $156.00 | $7.80 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $168.00 | $8.40 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $600.00 | $30.00 |
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Or see GPT-6 Sol pricing, GPT-6 Luna pricing, or compare any two models.
FAQ
Frequently asked questions
Is GPT-6 Sol cheaper than GPT-6 Luna?
GPT-6 Luna is cheaper than GPT-6 Sol at standard rates, with 20× cheaper input and 20× cheaper output. Based on standard API rates last checked on 29 Sept 2026.
How much do GPT-6 Sol and GPT-6 Luna cost per million tokens?
GPT-6 Sol: $2 per million input tokens and $10 per million output tokens. GPT-6 Luna: $0.10 input and $0.50 output. These are standard rates in USD, before tax, from each provider’s own pricing page.
Which is cheaper with the Batch API?
GPT-6 Sol’s batch rates are $1 input and $5 output per million tokens (50% off); GPT-6 Luna’s batch rates are $0.05 input and $0.25 output per million tokens (50% off).
Does prompt caching change the comparison?
GPT-6 Sol charges $0.20 per million cached input tokens, against $2 for normal input; GPT-6 Luna charges $0.01 per million cached input tokens, against $0.10 for normal input. Cache write and storage charges are extra and aren’t included here.