Model specification · OpenAI
GPT-5.6 Luna
openai/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...
SpecificationsReported values
- Context window
- 1.1M
- Maximum output
- 128K
- Architecture
- text+image+file->text
- Tokenizer
- GPT
- Knowledge cutoff
- 2026-02-16
- Moderated
- Yes
- Input modalities
- fileimagetext
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $0.200 / M |
| Output | $1.20 / M |
Benchmark indexesReported indexes
- Intelligence
- 23.8
- Coding
- 71.4
- Agentic
- 42.1
- Design Arena Elo
- —
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.00320 |
| Long analysis | 100K / 4K × 1 | 50% | $0.016 |
| Workday | 20K / 2K × 1,000 | 30% | $5.32 |
More from OpenAIAll OpenAI models
| Model | Context | Input / M | Output / M | Intel. |
|---|---|---|---|---|
| GPT-6 Astra | 1.1M | $10.00 | $50.00 | 56.9 |
| GPT-6.1 Sol | 1.1M | $2.00 | $10.00 | 54.6 |
| GPT-6.1 Terra | 1.1M | $1.00 | $5.00 | 51.3 |
| GPT-6 Sol | 1.1M | $2.00 | $10.00 | 44.2 |
| GPT-5.6 Terra | 1.1M | $2.00 | $12.00 | 32.3 |
| GPT-6 Luna | 1.1M | $0.100 | $0.500 | 27.9 |
| gpt-oss-120b | 131K | $0.150 | $0.600 | 3.8 |