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What is GPT-5.6 Luna?

GPT-5.6 Luna is the lowest-cost model in OpenAI’s GPT-5.6 family, built for fast and affordable AI assistance across everyday and technical workflows. The GPT-5.6 lineup includes Sol as the flagship model, Terra as the balanced model for everyday work, and Luna as the efficient model for users who need strong capability at lower cost. Luna is intended for developers, businesses, and teams that need scalable AI for coding help, workflow automation, research support, analysis, customer-facing applications, and high-volume API usage. In the pasted preview text, Luna is presented as part of the same GPT-5.6 release process and benchmark set as Sol and Terra. It appears in evaluations for command-line coding workflows, long-horizon biology tasks, ExploitBench, and ExploitGym, indicating that it is designed to handle more than simple chat use cases. The model is priced at a lower per-token rate than Sol and Terra, making it more suitable for applications where cost efficiency is a major priority. GPT-5.6 Luna also supports the new GPT-5.6 prompt caching approach, including explicit cache breakpoints, a 30-minute minimum cache life, cache writes billed above the uncached input rate, and discounted cached-input reads. Like the rest of the GPT-5.6 family, Luna is developed with layered safeguards matched to model capability. These safeguards include trained refusals for prohibited cyber assistance, real-time misuse classifiers, paused generation for higher-risk cases, account-level review, monitoring, enforcement, automated red-teaming, and third-party human expert red-teaming. Luna is expected to support legitimate defensive and technical workflows such as code review, debugging, patch development, security education, and defensive testing while making prohibited misuse more difficult and detectable. GPT-5.6 Luna helps organizations deploy GPT-5.6-class AI where speed, affordability, scalability, and safe production use are the most important requirements.

What is GPT-5.5 Instant?

The newest version of ChatGPT, known as GPT-5.5 Instant, has been introduced as the standard model, meticulously developed to improve both intelligence and accuracy, resulting in responses that are more straightforward and precise, tailored to the unique needs of each user. This upgrade is crafted for everyday conversations, benefiting millions by enriching interactions with more robust and relevant answers across a diverse range of subjects, all while maintaining a seamless conversational flow and effectively leveraging shared context to create personalized experiences. Furthermore, GPT-5.5 Instant has made significant strides in reliability, showing enhanced factual accuracy in crucial areas such as healthcare, legal matters, and finance, where exactness is essential. The model also showcases increased capability in managing daily tasks, particularly in the areas of processing visual uploads, tackling STEM-related questions, and determining when to utilize web searches for the best results. Each response is not only brief and to the point but also preserves the engaging and enjoyable nature that users have come to appreciate, thereby elevating both satisfaction and the quality of interactions. This model is designed not just to fulfill user expectations but also to consistently surpass them, making every conversation a more enriching experience. Additionally, the advancements in GPT-5.5 Instant reflect a commitment to continuous improvement, ensuring that users can rely on it for an exceptional conversational experience.

Media

Media

Integrations Supported

ChatGPT
ChatGPT Enterprise
ChatGPT Plus
ChatGPT Pro
Auggie CLI
ChatGPT Work
FastRouter
GPT-5.1-Codex
LobeHub
Muse
Oh My OpenAgent
Perplexity Computer
Prism
Solidity
Springhub
Swift
TypeScript
Use AI
Wazzap AI
Xcode

Integrations Supported

ChatGPT
ChatGPT Enterprise
ChatGPT Plus
ChatGPT Pro
Auggie CLI
ChatGPT Work
FastRouter
GPT-5.1-Codex
LobeHub
Muse
Oh My OpenAgent
Perplexity Computer
Prism
Solidity
Springhub
Swift
TypeScript
Use AI
Wazzap AI
Xcode

API Availability

Has API

API Availability

Has API

Pricing Information

$0.20 per 1M tokens (input)
$0.20 input / $1.20 output per 1 million tokens
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com/index/gpt-5-5-instant/

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