GPT-5.6 Luna Pro

OPENAI Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1504Chatbot Arena Verified

Max Context Limit1,050,000Max Out: 128,000 tokens

Prompt Caching90% OFF$0.02 / 1M cached

Standard API / 1M$1.40🧠 Deep Reasoner

Model Capabilities & Contract SLAs

Coding & Logic
Fictional
Reasoning
Agentic
📋 Strict JSON Schema
🛠️ Native Tool Calling
🧠 Extended Test-Time Reasoning

GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...

Granular Pricing Matrix

Input Tokens (Standard Prompt)$0.20 / 1M

⚡ Cached Input (Prompt Cache Read)90% OFF$0.02 / 1M

Output Tokens (Completion)$1.20 / 1M

Pricing data via OpenRouter. Sync: 10/2/2026

Evaluate Competitors

VS Engine MatchupGPT-5.6 Luna Pro vs Anthropic: Claude Opus 5.5 (batch)VS Engine MatchupGPT-5.6 Luna Pro vs Anthropic: Claude Opus 5 VS Engine MatchupGPT-5.6 Luna Pro vs OpenAI: GPT Chat Latest VS Engine MatchupGPT-5.6 Luna Pro vs Anthropic: Claude Opus 4.6 (batch)VS Engine MatchupGPT-5.6 Luna Pro vs Anthropic: Claude Opus 4.5 (batch)VS Engine MatchupGPT-5.6 Luna Pro vs Qwen2.5 72B Instruct