GPT-5.6 Luna
- Price
- Freemium
- API
- No
- Weights
- No
WHAT IT DOES
GPT-5.6 Luna is the smallest and cheapest model in OpenAI's GPT-5.6 family, released alongside Sol and Terra in July 2026. It is designed for cost-sensitive, high-volume workloads where latency and price matter more than absolute frontier performance. It shares the same 1.05M-token context window and multimodal input support as Sol and Terra, making it suitable for classification, summarization, light coding, chat, and high-throughput agent workflows.
WHY WE PICKED IT
Luna brings GPT-5.6-scale capabilities to high-volume applications at roughly one-tenth of Sol's cost, with strong enough performance for everyday tasks and broad API availability.
QUICK FACTS
STRENGTHS
- ✓1.05M-token context window at a fraction of Sol/Terra cost
- ✓Priced at $0.20/M input and $1.20/M output tokens after the July 30, 2026 cut
- ✓Fast and efficient for high-volume, simple tasks
- ✓Supports the same API endpoints and tools as Sol and Terra
- ✓Expanded access for free ChatGPT users
LIMITATIONS
- ⚠Not designed for complex reasoning or frontier coding
- ⚠Lower capability ceiling than Terra and Sol
- ⚠Best for narrow, well-defined tasks rather than open-ended creative work
- ⚠Performance may degrade on tasks requiring deep domain expertise
GETTING STARTED
Access GPT-5.6 Luna via ChatGPT or the OpenAI API using the gpt-5.6-luna snapshot. It is the cheapest way to run GPT-5.6-scale workloads. Use it for classification, summarization, light drafting, and other high-volume tasks where cost per token is the primary concern.
QUICK TIPS
SIMILAR TOOLS
USE CASE EXAMPLES
High-Volume Classification
Classify or route large numbers of support tickets, reviews, or documents cheaply.
- Define the categories and rules
- Send batches of items to Luna via the API
- Review accuracy on a sample
- Tune prompts to improve precision
- Scale throughput while monitoring cost
Light Drafting and Summarization
Generate short summaries, simple drafts, and chat responses at very low cost.
- Provide the source text or topic
- Ask for a brief summary or draft
- Iterate on length and tone
- Use Terra or Sol for more complex revisions
- Deploy at scale for cost-sensitive applications
PRICING
Free tier includes limited features. Paid plans unlock full access, higher usage limits, and commercial usage rights.
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EXPLORE ALTERNATIVES
Compare GPT-5.6 Luna with 5+ similar llms AI tools.
FREQUENTLY ASKED QUESTIONS
Is GPT-5.6 Luna free?
GPT-5.6 Luna offers a free tier with optional paid upgrades.
Does GPT-5.6 Luna have an API?
No, GPT-5.6 Luna does not appear to offer a public API.
What is GPT-5.6 Luna best for?
GPT-5.6 Luna is best for Cost-Sensitive Workloads. GPT-5. Luna brings GPT-5.6-scale capabilities to high-volume applications at roughly one-tenth of Sol's cost, with strong enough performance for everyday tasks and broad API availability.
What platforms does GPT-5.6 Luna support?
GPT-5.6 Luna supports web, api, mobile.
Is GPT-5.6 Luna open source?
No, GPT-5.6 Luna is not open source.
How do I get started with GPT-5.6 Luna?
Access GPT-5.6 Luna via ChatGPT or the OpenAI API using the gpt-5.6-luna snapshot. It is the cheapest way to run GPT-5.6-scale workloads. Use it for classification, summarization, light drafting, and other high-volume tasks where cost per token is the primary concern.
How do I use GPT-5.6 Luna?
GPT-5.6 Luna is a large language model for text generation, analysis, and conversation. Access through the web interface. Enter prompts or questions to get responses. It excels at 1.05m-token context window at a fraction of sol/terra cost.
FEATURED ON CURATEDAI
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