AI model · by OpenAI
GPT-6 Luna
GPT-6 Luna is OpenAI's most efficient model, designed for concentrated workloads that run at large volume.
- 1.1M tokens context
- Closed weights
- Checked against OpenAI's page 19 Oct 2026
What GPT-6 Luna is for
OpenAI says the model suits concentrated, high-throughput workloads. Data can be kept in the EU across Standard, Fast, Flex, and Batch processing, and regional processing carries a 10% surcharge where offered.
What OpenAI says it does well
- Supports text and image input with text output
- Context window of 1,050,000 tokens and up to 128,000 max output tokens
- Supports streaming, function calling, and structured outputs
- Reasoning effort configurable across none, low, medium (default), high, xhigh, and max
Where to use it
- EU data residency with Standard, Fast, Flex, and Batch processing
Limits OpenAI mentions
- Audio and video modalities are not supported
- Fine-tuning is not supported
- Knowledge cutoff of May 18, 2026
- Regional processing adds a 10% premium where available