GPT-5.6 Luna
by OpenAI
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
Quick Facts
Provider
OpenAI
Model ID
openai/gpt-5.6-luna
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
Best for
- 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
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.
Compare how GPT-5.6 Luna and two other models answer this prompt.
Use GPT-5.6 Luna to produce a concise answer, then list assumptions and tradeoffs.
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsCompare and Use GPT-5.6 Luna
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Frequently Asked Questions
Try GPT-5.6 Luna In Related Workflows
Model pages work best when they connect to real tasks. Use these bots and utilities to test GPT-5.6 Luna against coding, research, and model-selection workflows.
Use GPT-5.6 Luna on RyddleAI
Access GPT-5.6 Luna with a RyddleAI subscription.
Compare GPT-5.6 Luna With Alternatives
Use these nearby models to test whether GPT-5.6 Luna is the right choice for your prompt, budget, and model family preference.
| Alternative | Provider | Tier | Why compare | Page |
|---|---|---|---|---|
| GPT-5.6 Luna Pro | 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 |