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 | 37.3 | 0 t/s |
| xhigh | 33.9 | 0 t/s |
| high | 32.1 | 0 t/s |
| medium | 29.5 | 0 t/s |
| low | 20.9 | 0 t/s |
| Non-reasoning | 18.3 | 0 t/s |
Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers
Reported on 3 evals across 3 domains - best 66.6% on DeepSWE · #3 of 3