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OpenAI · Language model

GPT-6 Luna

openai/gpt-6-luna
  • Language
Released Sep 22, 2026

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...

Specifications

Context window
1,050,000 tokens
Max output
128,000 tokens
Input
file, image, text
Output
text
Reasoning effort
max, xhigh, high, medium, low, none
Tokenizer
GPT
Moderation
provider-moderated

Supported parameters

Accepted by the model and forwarded as-is by the gateway.

  • max_completion_tokens
  • max_tokens
  • reasoning
  • reasoning_effort
  • response_format
  • seed
  • structured_outputs
  • tool_choice
  • tools

Use it

POST /api/v1/chat/completions · MCP chat · full reference

curl https://omnirail.org/api/v1/chat/completions \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-6-luna","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'