OpenAI: GPT-6 Luna API
OpenAI's most efficient GPT-6 model for focused, high-volume tasks, emphasizing cost and throughput.
- Context window: 1,050,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-09-22
- Knowledge cutoff: 2026-05-18
Frequently Asked Questions
What is the context window of GPT-6 Luna?
GPT-6 Luna supports a context window of up to 1,050,000 tokens.
Does GPT-6 Luna support function calling?
Yes. GPT-6 Luna supports tool / function calling.
Does GPT-6 Luna support reasoning?
Yes. GPT-6 Luna is a reasoning-capable model.
What is the knowledge cutoff of GPT-6 Luna?
The knowledge cutoff of GPT-6 Luna is 2026-05-18.