OpenAI
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.
At a glance
- Input / 1M
- $0.20
- Output / 1M
- $1.20
- Context
- 1.05M
- Max output
- 128K
- Intelligence
- Not available
- Released
- Jul 2026
Pricing
GPT-5.6 Luna Pro API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $0.20 |
|---|---|
| Output tokensPer 1M tokens | $1.20 |
| Cached input (read)Per 1M tokens | $0.02 |
| Cache writePer 1M tokens | $0.25 |
| Long-context pricingPrompts above 272K tokens | $0.40 in / $1.80 out |
| Web searchPer request | $0.01 |
Chat message
2K in, 500 out
$1
per 1,000 requests
Coding task
30K in, 4K out
$10.80
per 1,000 requests
Long document summary
150K in, 2K out
$32.40
per 1,000 requests
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1.05M tokens
- Max output
- 128K tokens
- Input types
- File, Image, Text
- Output types
- Text
- Reasoning effort
- Max, Extra high, High, Medium, Low, None
- Release date
- July 9, 2026
- Knowledge cutoff
- February 16, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
GPT-5.6 Luna Pro vs other models
See how GPT-5.6 Luna Pro stacks up head to head on price, benchmarks, and features.
VS
GPT-5.6 Luna Pro vs DeepSeek V4.1 Flash
OpenAI vs DeepSeek
See comparisonVSGPT-5.6 Luna Pro vs GLM 5.3 Flash
OpenAI vs Z.ai
See comparisonVSGPT-5.6 Luna Pro vs Hy4 preview
OpenAI vs Tencent
See comparisonVSGPT-5.6 Luna Pro vs GPT-6 Luna
OpenAI vs OpenAI
See comparisonVSGPT-5.6 Luna Pro vs DeepSeek V4 Flash 0731
OpenAI vs DeepSeek
See comparisonVSGPT-5.6 Luna Pro vs DeepSeek V4 Flash 0423
OpenAI vs DeepSeek
See comparisonMore GPT-5.6 Luna Pro comparisons
Alternatives
GPT-5.6 Luna Pro alternatives
Similar models worth considering, and where each one has the edge.
Z.ai
GLM 5.3 Flash
DeepSeek
DeepSeek V4.1 Flash
OpenAI
GPT-6 Luna
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does GPT-5.6 Luna Pro cost?
GPT-5.6 Luna Pro costs $0.20 per 1M input tokens and $1.20 per 1M output tokens through the API. A typical chat message costs about $1 per 1,000 messages.
What is the context window of GPT-5.6 Luna Pro?
GPT-5.6 Luna Pro accepts up to 1.05M tokens of input and can write up to 128K tokens in a single response.
What is the best alternative to GPT-5.6 Luna Pro?
GLM 5.3 Flash from Z.ai is a strong alternative. It offers: 2.4x cheaper output, accepts video, newer release.
Can I use GPT-5.6 Luna Pro alongside other models?
Yes. Shortcut Chat sends one prompt to GPT-5.6 Luna Pro and any other models you pick at the same time, so you can compare answers side by side.
Try GPT-5.6 Luna Pro next to every other model.
Use GPT-5.6 Luna Pro alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.