GPT-5.6 Luna vs GPT-5.6 Luna Pro
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-5.6 Luna and GPT-5.6 Luna Pro.
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...
GPT-5.6 Luna Pro
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. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Technical Specifications
| Specification | GPT-5.6 Luna | GPT-5.6 Luna Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 1,050,000 tokens | 1,050,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | beta |
| API Available | Yes | Yes |
| Released Date | 2026-07-09 | 2026-07-09 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.6 Luna
$1.00
GPT-5.6 Luna Pro
$1.00
Output Price per Million Tokens
GPT-5.6 Luna
$6.00
GPT-5.6 Luna Pro
$6.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-5.6 Luna Quirks & Gotchas
No developer gotchas reported.
GPT-5.6 Luna Pro Quirks & Gotchas
No developer gotchas reported.