OpenAI: GPT-5.6 Luna Pro
openai/gpt-5.6-luna-pro
ReasoningToolsJSONVision
Intelligence
—
Design Elo
—
Speed
239
14th fastest
Latency
4.0s
first token
Input price
$1.00
202nd cheapest
Context
1.1M
128K max out
How it compares
Faster than96%
of all ranked models
Cheaper than34%
of all ranked models
Overview
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
Providers & pricing (5)
| Provider | In $/M | Out $/M | Context | Uptime |
|---|---|---|---|---|
| OpenAI | $1.00 | $6.00 | 1.1M | 90.6% |
| OpenAI | $0.500 | $3.00 | 1.1M | 90.6% |
| OpenAI | $2.00 | $12.00 | 1.1M | 90.6% |
| Azure | $1.00 | $6.00 | 1.1M | 96.2% |
| Azure | $1.10 | $6.60 | 1.1M | — |
Specifications
Context window1.1M
Max output128K
Knowledge cutoffFeb 2026
Input modalitiesfile, image, text
Output modalitiestext
Prompt caching—
Cache read price$0.100/M
ModeratedYes
GPT-5.6 Luna Pro FAQ
How much does GPT-5.6 Luna Pro cost?
GPT-5.6 Luna Pro costs $1.00 per million input tokens and $6.00 per million output tokens via OpenRouter, making it 202nd cheapest of 306 paid models.
How fast is GPT-5.6 Luna Pro?
GPT-5.6 Luna Pro generates around 239 tokens per second with 4.0s time-to-first-token (p50), the 14th fastest tracked model.
What is GPT-5.6 Luna Pro's context window?
GPT-5.6 Luna Pro supports a 1.1M-token context window and can output up to 128K tokens. It accepts file, image, text input.