# OpenAI: GPT-5.6 Luna: AI model fact sheet

- **Provider:** openai
- **Released:** 2026-07-09
- **Context window:** 1,050,000 tokens
- **API pricing:** $1.00 / 1M input, $6.00 / 1M output
- **OpenRouter ID:** openai/gpt-5.6-luna
- **Capabilities:** conversation, reasoning, code-generation, analysis, agentic-tool-use

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series, suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, with capable reasoning for its price tier.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gpt-5.6-luna