OpenAI: GPT-5.6 Luna Pro
GPT-5.6 Luna Pro from OpenAI is an advanced AI model designed to handle text, file, and image inputs within a context length of 1,050,000 tokens. It supports reasoning and tools integration but does not offer structured output. While it excels in versatility, the absence of benchmark coverage means its performance remains unverified. Given its price at $0.1 per million input tokens and $0.6 per million output tokens, GPT-5.6 Luna Pro is more suitable for organizations willing to invest in robust AI capabilities, despite the lack of independent validation of its strengths.
- 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 $0.10/M input and $0.60/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 | $0.08 |
| A month of a busy support chatbot | 5M in / 2M out | $1.70 |
Price & spec history
Tracked daily by PicksByModel since 2026-07-17.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 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 5 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #10 | Social Media PostsWriting · of 25 ranked | 119 |
| #10 | Voice Assistant BackendVoice · of 25 ranked | 123 |
| #16 | Self-Hosted / LocalCost · of 25 ranked | 117 |
| #19 | Real-Time ChatLatency · of 25 ranked | 117 |
| #21 | Cheap Bulk InferenceCost · of 25 ranked | 137 |
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?
- $0.10 per million input tokens and $0.60 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.