GPT-5.6 Luna
OpenAI · Mid · Multimodal
GPT-5.6 Luna is OpenAI's lightweight model in the GPT-5.6 series, optimized for speed and efficiency across a wide range of tasks.
- Strengths
- Delivers fast inference and low latency, making it well-suited for real-time applications and high-volume request handling.
- Best for
- Chat applications, text classification, lightweight agentic workflows, and scenarios where response speed is prioritized over maximum capability.
- Limitations
- May not match the reasoning depth or performance of larger models on complex, multi-step reasoning tasks or highly specialized domains.
Input / 1M
$1.00
Output / 1M
$6.00
Cached input / 1M
$0.1
Context window
1.05M
Also billed
- Cache write
- $1.25 / 1M
Flagship prices over time
Every provider's most-powerful model, priced at launch, charted on one log axis.
Price history
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 10 Jul 2026 | $1.00 | $6.00 | $0.1 | Imported from OpenRouter | openrouter.ai |