GPT-5.6 Luna
by OpenAI
Pricing · per 1M tokens
Input
$1.00
per million tokens
Output
$6.00
per million tokens
| Cached input | $0.100/Mtok (10% of input — prompt caching) |
|---|---|
| Blended avg cost* | $3.50/Mtok |
Overview
Low-cost, high-volume GPT-5.6 tier — the efficient option in the Sol/Terra/Luna scheme, for cost-sensitive workloads. 1.05M context, 128K max output, text + image input. $1/$6 per 1M tokens (cached input $0.10).
Capabilities
Input 2/5
Text ✓
Image ✓
Audio
Video
PDF
Output 1/5
Text ✓
Image
Audio
Video
Embedding
Features 4/9
Prompt caching ✓
Reasoning ✓
Coding
Fast inference
Long context ✓
Open weights
Multimodal ✓
Web search
Realtime
Specifications
| Provider | OpenAI |
|---|---|
| Context window | 1M tokens |
| Modality | text, image |
| Parameters | Proprietary |
| Open source | No — proprietary |
| Released | Jul 9, 2026 |
| Status | Current |
| Last updated | Jul 9, 2026 |
| Tags | reasoning multimodal |
Cost calculator
At a glance
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Price history
Last updated: Jul 9, 2026 · price links to the official provider pricing page (source above)
No price changes detected — this model's pricing has been stable since we began tracking it.