OpenAI: GPT-5.6 Luna Pro
OpenAI's GPT-5.6 Luna Pro is designed for versatile input handling, supporting text, image, and file inputs, with a context length of 1,050,000 tokens. It excels in reasoning tasks and can integrate external tools to perform more complex operations. However, this model does not offer structured output capabilities. Given its robust feature set and reasonable pricing at $0.2 per million input tokens and $1.2 per million output tokens, GPT-5.6 Luna Pro is suitable for businesses requiring flexible AI solutions with extensive context processing and tool integration. Despite having no independent benchmark coverage yet, the model's comprehensive modality support and tool capabilities make it a strong contender for those willing to invest in high-quality, versatile AI solutions.
- Model ID
- openai/gpt-5.6-luna-pro
- Vendor
- openai
- Released
- July 2026
- Tokenizer
- GPT
- Input Modalities
- file, image, text
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $0.20/M input and $1.20/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.16 |
| A month of a busy support chatbot | 5M in / 2M out | $3.40 |
Price & spec history
Tracked daily by PicksByModel since 2026-07-17.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 2026-08-18 | $0.20 | $1.20 | 1,050,000 |
| 2026-07-31 | $0.10 | $0.60 | 1,050,000 |
| 2026-07-28 | $0.50 | $3.00 | 1,050,000 |
| 2026-07-17 | $1.00 | $6.00 | 1,050,000 |
Category rankings
Where OpenAI: GPT-5.6 Luna Pro places across the 1 category it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #25 | Real-Time ChatLatency · of 25 ranked | 117 |
Similar models
OpenAI: GPT-5.6 Luna Pro (batch)
OpenAI: GPT-5.6 Luna
OpenAI: GPT-5.6 Luna (batch)
OpenAI: GPT-5.6 Terra Pro
OpenAI: GPT-5.6 Terra Pro (batch)
OpenAI: GPT-5.6 Terra
Quick answers
- How much does OpenAI: GPT-5.6 Luna Pro cost?
- $0.20 per million input tokens and $1.20 per million output tokens.
- What is OpenAI: GPT-5.6 Luna Pro's context window?
- 1,050,000 tokens, roughly 1,575 pages of text in a single request.
- Does OpenAI: GPT-5.6 Luna Pro support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.6 Luna Pro process images?
- Yes, it accepts image input.