GPT-5.6 Luna Pro
by OpenAI
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
Quick Facts
Provider
OpenAI
Model ID
openai/gpt-5.6-luna-pro
Modality
Text and Image and File to Text
Tier
Premium
Last Updated
2026-07-22
Released
2026-07-09
Context Length
1050K tokens
Tokenizer
GPT
Input Price
$1.00/M
Output Price
$6.00/M
When To Use GPT-5.6 Luna Pro
Best for
- Coding, debugging, and implementation planning
- Reasoning-heavy questions and step-by-step analysis
- Research, summarization, and document work
- Image understanding, screenshots, and visual questions
- Comparing OpenAI responses against other leading AI models
Not ideal for
- High-volume casual chats where you want to conserve premium credits
- Native image generation workflows
- Voice, speech, or audio transcription workflows
Input & Output
Accepts
Generates
Pricing
All prices are per 1 million tokens
Input
$1.00/M
Output
$6.00/M
Cache Read
$0.10/M
Cache Write
$1.25/M
Web Search
$10000.00/M
Capabilities
- Natural language understanding and generation
- Image analysis and understanding
- Advanced reasoning and problem-solving
- Long context window for extended conversations
Example Prompts
Review this TypeScript function for edge cases, bugs, and simpler implementation options.
Turn this product requirement into a small implementation plan with tests.
Solve this problem step by step, then summarize the final answer in one paragraph.
Summarize these notes into key findings, risks, and recommended next steps.
Analyze this screenshot and explain what is happening, including any UI issues.
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsCompare and Use GPT-5.6 Luna Pro
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Frequently Asked Questions
Try GPT-5.6 Luna Pro In Related Workflows
Model pages work best when they connect to real tasks. Use these bots and utilities to test GPT-5.6 Luna Pro against coding, research, and model-selection workflows.
Use GPT-5.6 Luna Pro on RyddleAI
Access GPT-5.6 Luna Pro with a RyddleAI subscription.
Compare GPT-5.6 Luna Pro With Alternatives
Use these nearby models to test whether GPT-5.6 Luna Pro is the right choice for your prompt, budget, and model family preference.
| Alternative | Provider | Tier | Why compare | Page |
|---|---|---|---|---|
| GPT-5.6 Luna | Openai | Premium | Another OpenAI model to compare within the same provider family | View model |
| GPT-5.6 Terra Pro | Openai | Premium | Another OpenAI model to compare within the same provider family | View model |
| Gemini 3.6 Flash | Premium | Same tier alternative from another provider | View model | |
| Gemini 3.5 Flash Lite | Premium | Same tier alternative from another provider | View model |