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
Models
GPT-5.6 Luna
Added 10 July 2026
Overview
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...
How to use / API access
Call via OpenRouter with model id `openai/gpt-5.6-luna`.
- openrouter ·
openai/gpt-5.6-lunaDocs
OpenRouter id: openai/gpt-5.6-luna
Benchmarks
- Intelligence Index (artificial-analysis) : 51.2 index
- Coding Index (artificial-analysis) : 71.4 index
- Agentic Index (artificial-analysis) : 45.6 index
Notes
GPT-5.6 Luna is listed in the EDNA Models directory from the OpenRouter catalogue.
In the AI Pulse
Recent daily briefs from the Enterprise DNA AI Pulse that mention this. The short daily read on what is actually happening in AI.
- Frontier Labs Watch9 Aug 2026
OpenAI makes GPT-5.6 Luna the default model with unlimited free-tier text chats
- Business Models & Winners9 Aug 2026
OpenAI cut GPT-5.6 Luna's price 80% the same week Anthropic's promo pricing is set to expire
- Frontier Labs Watch8 Aug 2026
OpenAI removes ChatGPT free-tier chat limits, defaults to GPT-5.6 "Luna"
- AI Trends Pulse7 Aug 2026
OpenAI dropped ChatGPT free-tier text-message caps (Free/Go tiers now default to
- Frontier Labs Watch2 Aug 2026
OpenAI cut GPT-5.6 Luna API pricing 80% and Terra 20%
- Frontier Labs Watch1 Aug 2026
A real pricing war, not a one-off cut
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