Input
$0.20
Output
$1.20
Context
1.05M
GPT-5.6 Luna costs $0.20 per million input tokens and $1.20 per million output tokens. Cached input is billed at $0.02 per million, 90% less than fresh input.
Specifications
| Lab | OpenAI |
| Model id | openai/gpt-5.6-luna |
| Input price | $0.20 per million tokens |
| Output price | $1.20 per million tokens |
| Cached input price | $0.02 per million tokens |
| Context window | 1,050,000 tokens (1.05M) |
| Maximum output | 128,000 tokens (128K) |
| Tool calling | yes |
| Image input | yes |
| Reasoning | yes |
| First listed | 9 July 2026 |
OpenAI's other models
| Model | Input / 1M | Output / 1M | Context | Listed |
|---|---|---|---|---|
| GPT-6.1 Terra | $1 | $5 | 1.05M | 26 October 2026 |
| GPT-6.1 Terra Pro | $1 | $5 | 1.05M | 26 October 2026 |
| GPT-6.1 Sol | $2 | $10 | 1.05M | 29 September 2026 |
| GPT-6.1 Sol Pro | $2 | $10 | 1.05M | 29 September 2026 |
| GPT-6 Luna | $0.10 | $0.50 | 1.05M | 22 September 2026 |
| GPT-6 Luna Pro | $0.10 | $0.50 | 1.05M | 22 September 2026 |
| GPT-6 Sol Pro | $2 | $10 | 1.05M | 22 September 2026 |
| GPT-6 Astra | $10 | $50 | 1.05M | 4 September 2026 |
| GPT-6 Astra Pro | $10 | $50 | 1.05M | 4 September 2026 |
| GPT-5.6 Luna Pro | $0.20 | $1.20 | 1.05M | 9 July 2026 |
| GPT-5.6 Sol Pro | $4 | $20 | 1.05M | 9 July 2026 |
| GPT-5.6 Terra Pro | $2 | $12 | 1.05M | 9 July 2026 |
Cited in these articles
- Cut AI Agent Costs With Model Routing (2026)
- Price Your AI Product to Beat Token Costs 2026
- GPT-6 Astra: What Shipped, Benchmarks, Pricing 2026
- Cut AI Costs With Prompt Caching (2026)
Where these numbers come from
Read from OpenRouter's listing of GPT-5.6 Luna every 6 hours, with OpenAI's own /models endpoint confirming the model, into the catalog Founden's builders choose their models from. Prices are OpenRouter's listed price per million tokens: for a lab's closed models that is the lab's own list price, and for an open-weight model it is the price of the host OpenRouter routes to by default, which can differ from the lab's own API and from other hosts. US dollars, before batch, volume or regional discounts. Every model.