Model Details
Where is GPT-5.6 Luna a perfect fit?
- High-volume production applications processing large request volumes
- Classification, extraction, routing, summarization, and transformation
- Cost-sensitive coding and software-development workflows
- Agentic workflows involving function calling and external tools
- Web search, file search, and code-interpreter applications
- Computer-use and workflow-automation agents
- Long-context processing where inexpensive token consumption is important
- Subtasks that can be delegated from more capable Sol or Terra agents
Quick Model Estimate
Your GPT-5.6 Luna Cost Estimate
💰 Total Cost
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for 1000 input + 1000 output tokens
Cost Breakdown
Prices are watched for changes and checked against the provider's own page.
Pricing
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Context Size
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 OpenAI | Text | Standard | $0.2000 | $1.2000 | $0.0200 | $0.2500 | Up to 272,000 tokens | → |
| OpenAI | Text | Standard | $0.4000 | $1.8000 | $0.0400 | $0.5000 | 272,000+ tokens | → |
| OpenAI | Text | Batch | $0.1000 | $0.6000 | $0.0100 | $0.1250 | Up to 272,000 tokens | → |
| OpenAI | Text | Batch | $0.2000 | $0.9000 | $0.0200 | $0.2500 | 272,000+ tokens | → |
| OpenAI | Text | Flex | $0.1000 | $0.6000 | $0.0100 | $0.1250 | Up to 272,000 tokens | → |
| OpenAI | Text | Flex | $0.2000 | $0.9000 | $0.0200 | $0.2500 | 272,000+ tokens | → |
| OpenAI | Text | Priority | $0.4000 | $2.4000 | $0.0400 | $0.5000 | Up to 272,000 tokens | → |
| OpenAI | Text | Priority | $0.8000 | $3.6000 | $0.0800 | $1.0000 | 272,000+ tokens | → |
 Perplexity | Text | Standard | $0.2000 | $1.2000 | $0.0200 | N/A | Up to 272,000 tokens | → |
| Perplexity | Text | Standard | $0.4000 | $1.8000 | $0.0400 | N/A | 272,000+ tokens | → |
Price changes
Every recorded change to GPT-5.6 Luna’s price, most recent first. Changes across all models are on the changes page.
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OpenAI cut the price of GPT-5.6 Luna, effective 30 July 2026.
Input $1.00 → $0.20 per 1M tokens (-80%), and 3 other price fields. 7 configurations changed.
Per-configuration detail on OpenAI → -
Perplexity cut the price of GPT-5.6 Luna, effective 30 July 2026.
Input $1.00 → $0.20 per 1M tokens (-80%), and 2 other price fields. 2 configurations changed.
Per-configuration detail on Perplexity →
Benchmarks
Scores from standardized evaluations by Artificial Analysis and Design Arena. Higher is better — the indices summarize overall ability, while the detailed scores break down performance on individual benchmarks.
Artificial Analysis
Higher is better · benchmarked by Artificial AnalysisGraduate-level questions in biology, chemistry & physics
Expert-level questions across many academic domains
Unpublished physics research reasoning problems
Long-context reasoning across large inputs
Research-level scientific coding tasks
Economically valuable, real-world knowledge work
Breadth of factual knowledge across domains
How reliably the model avoids fabricated answers
| Variant | GPQA Diamond | Humanity's Last Exam | AA-LCR | SciCode | CritPt | GDPval | Omniscience Accuracy | Omniscience Non-Hallucination |
|---|---|---|---|---|---|---|---|---|
| GPT-5.6 Luna (Max) | 91.1% | 39.5% | 83.7% | 53.6% | 20.6% | 48% | 42.7% | 7.4% |
| GPT-5.6 Luna (Xhigh) | 89.5% | 37% | 81.7% | 50.5% | 20.6% | 45% | 42.4% | 7.5% |
| GPT-5.6 Luna (High) | 89.2% | 33.4% | 80.3% | 51.6% | 16.6% | 41.6% | 41.8% | 7.6% |
| GPT-5.6 Luna (Medium) | 85.9% | 25.8% | 75% | 46.8% | 4.9% | 31.5% | 40.7% | 9.1% |
| GPT-5.6 Luna (Low) | 83.5% | 19.8% | 70% | 46.1% | 2.6% | 24.7% | 39.6% | 10.1% |
| GPT-5.6 Luna (Non-reasoning) | 64.5% | 7.2% | 42.7% | 40.4% | 0.3% | 21% | 28.6% | 25% |
Compare GPT-5.6 Luna with
Two models side by side: worked costs, every rate, and every benchmark figure both of them report.
Other Models in the GPT-5.6 Family
FAQs about GPT-5.6 Luna
How much does GPT-5.6 Luna cost per 1M tokens?
GPT-5.6 Luna costs between $0.10 and $0.80 per million input tokens, and between $0.60 and $3.60 per million output tokens. The range covers Standard, Batch, Flex and Priority pricing.
What does a typical workload cost with GPT-5.6 Luna?
1,000 requests of 2,000 input and 500 output tokens each — 2,000,000 input and 500,000 output tokens in total — costs $0.50 with GPT-5.6 Luna at its lowest rates. Use the calculator on this page for your own volumes.
Has GPT-5.6 Luna's price changed?
Yes, once: OpenAI and Perplexity both cut it on 30 July 2026. OpenAI's input price went from $1.00 to $0.20 per million tokens.
Which provider is cheapest for GPT-5.6 Luna?
OpenAI has the lowest input rate for GPT-5.6 Luna, at $0.10 per million tokens. Across all providers: OpenAI from $0.10 and Perplexity from $0.20 per million input tokens.
Is there cheaper GPT-5.6 Luna pricing than the standard rate?
Yes. Batch pricing for GPT-5.6 Luna starts at $0.10 per million input tokens against $0.20 on the standard tier, about 50% lower.
What is GPT-5.6 Luna's context window?
GPT-5.6 Luna has a context window of 1,050,000 tokens, and returns up to 128,000 tokens in a single response.
What input types does GPT-5.6 Luna support?
GPT-5.6 Luna accepts text, image and file input, and returns text.
What is GPT-5.6 Luna's knowledge cutoff?
GPT-5.6 Luna's training data runs to 16 February 2026. It has no built-in knowledge of events after that date.