GPT-5.6 Luna
OpenAI · Multimodal · Released Jul 2026
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
$0.2
Output / 1M
$1.20
Cached input / 1M
$0.02
Context window
1.05M
Also billed
- Cache write
- $0.25 / 1M
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in decreased 80.0% out decreased 80.0%
- 90d
- in decreased 80.0% out decreased 80.0%
- 1y
- in decreased 80.0% out decreased 80.0%
- Since launch
- in decreased 80.0% out decreased 80.0%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 17 Aug 2026 | $0.2 | $1.20 | $0.02 | Imported from OpenRouter | openrouter.ai |
| 30 Jul 2026 | $0.1 | $0.6 | $0.01 | Imported from OpenRouter | openrouter.ai |
| 27 Jul 2026 | $0.5 | $3.00 | $0.05 | Imported from OpenRouter | openrouter.ai |
| 10 Jul 2026 | $1.00 | $6.00 | $0.1 | Imported from OpenRouter | openrouter.ai |