GPT 5.6 Luna vs GPT-6 Luna
Lower and Larger mark one number at a time; they don’t rank the models. How well a model does depends on your task; see Benchmarks for measured results.
| Detail | GPT 5.6 Lunaopenai/gpt-5.6-luna | GPT-6 Lunaopenai/gpt-6-luna |
|---|---|---|
| Maker | openai | openai |
| Kind | Chat | Chat |
| Input per 1M tokens | $0.21 | $0.105 Lower |
| Cached input per 1M tokens | $0.021 | $0.0105 |
| Cache write per 1M tokens | $0.2625 | $0.13125 |
| Output per 1M tokens | $1.26 | $0.525 Lower |
| Context window | 1,050,000 tokens | 1,050,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Capabilities | Reasoning, tool use, vision, file input, web search, fast | Reasoning, tool use, vision, file input, web search, fast |
| Takes | Text, image, pdf | Text, image, pdf |
| Returns | Text | Text |
| Zero data retention | Not on every provider | Not on every provider |
| No training on requests | Yes, on every provider | Yes, on every provider |
| Released | 2026-07-09 | 2026-09-22 |
Example costs
Example requests, priced at today’s rates with no cached input.
| Example request | GPT 5.6 Luna | GPT-6 Luna |
|---|---|---|
| 1,000 tokens in, 200 out | $0.000462 | $0.00021 |
| 10,000 tokens in, 1,000 out | $0.00336 | $0.001575 |
| 100,000 tokens in, 4,000 out | $0.02604 | $0.0126 |