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
Specifications
| Provider | OpenAI |
|---|---|
| Context window | 1,050,000 tokens (1.1M) |
| Input price | $0.2 / 1M tokens |
| Output price | $1.2 / 1M tokens |
| Input modalities | file, image, text |
| Output modalities | text |
| Model ID | openai/gpt-5.6-luna-pro |
Pricing is per 1M tokens, indicative pricing via OpenRouter (updated 2026-08-22); a provider's own list price may differ.
Frequently asked questions
How much does GPT-5.6 Luna Pro cost?
Indicative pricing (via OpenRouter, updated 2026-08-22) is $0.2 per 1M input tokens and $1.2 per 1M output tokens. A provider's own list price may differ. On Vincony, GPT-5.6 Luna Pro is available on credit-based pricing alongside 800+ other models.
What is GPT-5.6 Luna Pro's context window?
GPT-5.6 Luna Pro supports a context window of up to 1,050,000 tokens (1.1M), which is how much text it can consider at once.
Who makes GPT-5.6 Luna Pro?
GPT-5.6 Luna Pro is built by OpenAI. You can access it — and compare it against other providers' models — through Vincony's multi-model platform.
How do I use GPT-5.6 Luna Pro?
You can use GPT-5.6 Luna Pro directly through OpenAI, or via Vincony, which aggregates 800+ models (including GPT-5.6 Luna Pro) into one interface with side-by-side comparison and credit-based pricing.