GPT-5.6 Luna Pro
OpenAI released 2026-07-09
$0.450 per million tokens, balanced
No independent quality score.
No benchmark we track has measured this model. That is not the same as measuring it and finding it wanting — we simply cannot rank it, so we do not.
Every price dimension
| Input | $0.200/M |
|---|---|
| Output | $1.20/M |
| Cached input | $0.020/M |
| Cache write | $0.250/M |
| Web search | $0.01/call |
Past 272,000 tokens the price changes. Input goes to $0.400/M (2×) and output to $1.80/M. The headline rate does not apply to a long-context workload.
Independent scores
No independent benchmark has measured this model.
Capability
| Context window | 1.1M |
|---|---|
| Max output | 128K |
| Input modes | file, image, text |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2026-02-16 |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-08-24 |
| Quality data | unrated |
GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode