---
id: "openai/gpt-5.6-luna"
also: ["openai/gpt-5.6-luna-20260709", "requesty/openai/gpt-5.6-luna", "vercel/openai/gpt-5.6-luna"]
card_usd_per_m: "0.2 in, 1.2 out, at openai"
cheapest_list_usd_per_m: "0.1 in, 0.6 out, at openai/flex on openrouter"
cheapest_effective_usd_per_m: "0.0479 in, 0.6 out, at openai/flex on openrouter"
context: 1050000
max_output: 128000
input: ["file", "image", "text"]
output: ["text"]
released: "2026-07-09"
reasoning: ["max", "xhigh", "high", "medium", "low", "none"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_completion_tokens", "max_tokens", "reasoning", "reasoning_effort", "response_format", "seed", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "verbosity"]
endpoints: 23
gateways: "requesty (11), openrouter (9), vercel (3)"
no_training: 22
trains: 0
retains_prompts: 8
intelligence: 23.8000
coding: 71.4000
agentic: 42.1000
---
# OpenAI: GPT-5.6 Luna

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 its price tier.