GPT-5.6 Luna Description

GPT-5.6 Luna is OpenAI’s fast, cost-efficient model in the GPT-5.6 lineup. The GPT-5.6 family includes Sol for flagship performance, Terra for balanced everyday work, and Luna for strong capability at the lowest listed price. Luna is designed for users who need scalable AI support for routine tasks, coding assistance, workflow automation, analysis, and production API use cases where speed and cost matter. According to the pasted preview text, Luna is priced below both Sol and Terra, making it the most affordable GPT-5.6 option for high-volume workloads. The model is included in GPT-5.6 benchmark previews across Terminal-Bench 2.1, GeneBench v1, ExploitBench, and ExploitGym, showing that it is part of the same technical family used for coding, biology, and cybersecurity evaluations. Luna benefits from safeguards developed across the GPT-5.6 series, including model-level refusal training, real-time cyber and biology misuse classifiers, account-level signals, differentiated access, monitoring, enforcement, and ongoing testing. These controls are designed to preserve legitimate use cases such as debugging, code review, defensive testing, security education, and productivity automation while constraining prohibited misuse. GPT-5.6 Luna is planned for broader access through ChatGPT, Codex, and the API after the limited preview period. GPT-5.6 Luna helps developers and organizations run useful AI workflows with a practical balance of affordability, responsiveness, and safety.

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Pricing

Pricing Starts At:
$1 per 1M tokens (input)
Pricing Information:
$1 input / $6 output per 1 million tokens

Integrations

API:
Yes, GPT-5.6 Luna has an API
View Integrations

Reviews - 1 Verified Review

Total
ease
features
design
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Company Details

Company:
OpenAI
Year Founded:
2015
Headquarters:
United States
Website:
openai.com

Media

GPT-5.6 Luna Screenshot 1
GPT-5.6 Luna Screenshot 1 GPT-5.6 Luna Screenshot 2
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Product Details

Platforms
Web-Based
Types of Training
Training Docs
Customer Support
Online Support

GPT-5.6 Luna Features and Options

GPT-5.6 Luna Lists

GPT-5.6 Luna User Reviews

Write a Review
  • Name: Anonymous (Verified)
    Job Title: Engineer
    Length of product use: Less than 6 months
    Used How Often?: Daily
    Role: User
    Organization Size: 500 - 999
    Features
    Design
    Ease
    Pricing
    Likelihood to Recommend to Others
    1 2 3 4 5 6 7 8 9 10

    Great fast model

    Date: Jul 09 2026

    Summary: Five stars from me. GPT-5.6 Luna looks like a great fit for fast, affordable developer workflows where you need lots of useful AI assistance without paying flagship-model prices. It is the model I would use to make AI coding support feel always-on instead of expensive and occasional.

    Positive: GPT-5.6 Luna is the one I would use when speed and cost matter most. As a developer, I can see it being really useful for lightweight coding help, quick explanations, small refactors, simple scripts, test generation, issue triage, and agent steps that do not need the most expensive model in the stack.

    I also like Luna for multi-agent systems where a lot of small tasks need to run in parallel. OpenAI describes Luna as the fastest and most cost-efficient GPT-5.6 model, and that is exactly the kind of model developers need for high-volume workflows.

    Negative: Luna is not the model I would choose for the hardest reasoning tasks. If I were debugging a complicated distributed system, planning a major architecture change, or running a long autonomous coding agent, I would probably step up to Terra or Sol.

    It also depends heavily on good task routing. Luna can be extremely valuable when used for the right jobs, but expecting it to perform like the flagship model on every problem would be the wrong approach.

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