OpenAI API · verified September 25, 2026
GPT-5.6 Luna API pricing: $0.20 in / $1.20 out
Per million tokens, 1.05M context.
Input /1M$0.20
Output /1M$1.20
Context1.05M
ReleasedJul 2026
What real jobs cost
| 1,000 short chats | $0.64 |
| Summarise 100 long reports (20k tokens each) | $0.52 |
| Write a 90,000-word book | $0.15 |
| 10M input + 2M output tokens | $4.40 |
Estimates at the listed price. Use the calculator for your own numbers.
Similar-priced models
| Model | In | Out |
|---|---|---|
| GPT-6 Luna OpenAI | $0.10 | $0.50 |
| DeepSeek V4.1-Flash DeepSeek AI | $0.15 | $0.60 |
| Mistral Small 4 Mistral AI | $0.15 | $0.60 |
| GPT-5.4 nano OpenAI | $0.20 | $1.25 |
| Gemini 3.1 Flash-Lite Google | $0.25 | $1.50 |
| Mistral Large 3 Mistral AI | $0.50 | $1.50 |
Price history
| Date | Price | What changed |
|---|---|---|
| Jul 30, 2026 | Price cut |
Other OpenAI models
- GPT-6 Astra $10 / $50
- GPT-6 Sol $2 / $10
- GPT-6 Luna $0.10 / $0.50
- GPT-5.6 Sol $4 / $20
- GPT-5.6 Terra $2 / $12
- GPT-5.5 pro $30 / $180
- GPT-5.4 nano $0.20 / $1.25
GPT-5.6 Luna pricing questions
How much does GPT-5.6 Luna cost?
$0.20 per million input tokens and $1.20 per million output tokens, with a 1.05M context window.
How much does 1,000 chats cost on GPT-5.6 Luna?
About $0.64, assuming 800 input and 400 output tokens per chat.
Is there a cheaper alternative to GPT-5.6 Luna?
DeepSeek V4.1-Flash ($0.15 / $0.60) costs about 42% less on a typical 3:1 input/output mix. Test whether its quality is enough for your task.
Sources
Checked against the official pages below on September 25, 2026. Prices are USD before local tax. See how we verify prices and the change log.