---
title: "OpenAI: GPT-5.6 Luna Pro — price, capability and what beats it · Undominated.ai"
canonical: https://undominated.ai/models/openai__gpt-5.6-luna-pro/
description: "OpenAI: GPT-5.6 Luna Pro: $0.200/M in, $1.20/M out. Independent capability scores, context-tier pricing, and the models that are both better and cheaper."
---

# OpenAI: GPT-5.6 Luna Pro — price, capability and what beats it · Undominated.ai

> OpenAI: GPT-5.6 Luna Pro: $0.200/M in, $1.20/M out. Independent capability scores, context-tier pricing, and the models that are both better and cheaper.

[Leaderboard](/) / OpenAI

# GPT-5.6 Luna Pro

OpenAI · released 2026-07-09

 $0.450 per million tokens, balanced Balanced Summarise Chat Code gen Agentic

## 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