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
- file image text
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $0.100 / M |
| Output | $0.600 / M |
Benchmark indexesReported indexes
- Intelligence
- 51.2
- Coding
- 71.4
- Agentic
- 45.6
- Design Arena Elo
- —
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.00160 |
| Long analysis | 100K / 4K × 1 | 50% | $0.00790 |
| Workday | 20K / 2K × 1,000 | 30% | $2.66 |
More from OpenAIAll OpenAI models
| Model | Context | Input / M | Output / M | Intel. |
|---|---|---|---|---|
| GPT-5.6 Sol | 1.1M | $5.00 | $30.00 | 58.9 |
| GPT-5.6 Terra | 1.1M | $1.00 | $6.00 | 55 |
| GPT-5.5 | 1.1M | $5.00 | $30.00 | 54.8 |
| GPT-5.4 | 1.1M | $2.50 | $15.00 | 51.4 |
| GPT-5.4 Mini | 400K | $0.750 | $4.50 | 40 |
| GPT-5.4 Nano | 400K | $0.200 | $1.25 | 38.2 |
| GPT-5.1 | 400K | $1.25 | $10.00 | 36.9 |
| GPT-5 | 400K | $1.25 | $10.00 | 34.7 |
| GPT-5 Mini | 400K | $0.250 | $2.00 | 25.3 |
| gpt-oss-120b | 131K | $0.037 | $0.170 | 23.8 |
| o3 Mini High | 200K | $1.10 | $4.40 | 15.6 |
| gpt-oss-20b | 131K | $0.030 | $0.130 | 14.9 |