GPT-6 Luna
The lightweight, lowest-cost tier of OpenAI's GPT-6 family, for smaller and faster tasks.
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Context
1.1M
Weights
Closed
API only
Input
$0.10
/1M tok
Output
$0.50
/1M tok
Cache read
$0.01
0.10x input
Cache write
$0.13
1.25x input
Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter
| Reasoning effort | Index | Speed |
|---|---|---|
| max | 27.9 | 121 t/s |
| xhigh | 23.5 | 119 t/s |
| high | 21.4 | 115 t/s |
| medium | 18.5 | 124 t/s |
| low | 9.7 | 119 t/s |
| Non-reasoning | 9.4 | 113 t/s |
Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers
Reported on 11 evals across 8 domains - best 90.5% on GPQA Diamond · #47 of 559