GPT-6 Luna
OpenAI's most efficient model for focused, high-volume tasks — summarizing documents, extracting information, and answering quick questions
GPT-6 Luna
OpenAI • September 2026
Training Data
Not disclosed
GPT-6 Luna
September 2026
Parameters
Not disclosed
Training Method
Reinforcement Learning with Chain-of-Thought Reasoning
Context Window
1,050,000 tokens
Knowledge Cutoff
May 18, 2026
Key Features
1M Token Context • Lowest Cost ($0.10/$0.50) • High-Volume Tasks • Free & Go Tier Access
Capabilities
Cost-Efficiency: Maximum
Coding: Outstanding (66.6% DeepSWE v1.1)
Automation: Strong (+5.4 pts AutomationBench)
What's New in This Version
Beats GPT-5.6 Luna by 5.4 points on AutomationBench at 58% lower cost, and matches Claude Opus 5 on DeepSWE v1.1 (66.6%) at over 90% lower cost per task; $0.10/$0.50 per 1M tokens, and available to ChatGPT Free and Go users
OpenAI's most efficient model for focused, high-volume tasks — summarizing documents, extracting information, and answering quick questions
What's New in This Version
Beats GPT-5.6 Luna by 5.4 points on AutomationBench at 58% lower cost, and matches Claude Opus 5 on DeepSWE v1.1 (66.6%) at over 90% lower cost per task; $0.10/$0.50 per 1M tokens, and available to ChatGPT Free and Go users
Technical Specifications
Key Features
Capabilities
Other OpenAI Models
Explore more models from OpenAI
GPT-6.1 Sol
An upgrade to GPT-6 Sol that nearly matches GPT-6 Astra on agentic coding, computer use, and professional work at one-fifth of Astra's token prices
GPT-6 Sol
The GPT-6 workhorse for complex coding and agentic workflows — Astra-level reliability at a fraction of Astra's price
GPT-6 Astra
OpenAI's GPT-6 flagship — a generational leap in computer use, software engineering, science, and professional work that reaches the Critical cybersecurity threshold under OpenAI's Preparedness Framework
