In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- GPT-6 Luna is cheaper per output token: $0.50 against $3.96 per million tokens, so DeepSeek-V4-Pro-0813 costs 7.9 times as much.
- GPT-6 Luna reads more at once: a context window of 1M tokens against 1M.
- DeepSeek-V4-Pro-0813 can be downloaded and run on your own machine; GPT-6 Luna can't.
- On the 1 independent board that rank both, DeepSeek-V4-Pro-0813 places higher on 1 and GPT-6 Luna on 0.
Side by side
The specs.
| DeepSeek-V4-Pro-0813 | GPT-6 Luna | |
|---|---|---|
| Made by | DeepSeek · China | OpenAI · US |
| Released | Aug 13, 2026 | Sep 22, 2026 |
| Price per 1M tokens | $1.32 in / $3.96 out (peak-hours price) | $0.10 in / $0.50 out |
| Context window | 1M | 1M |
| Takes in | text | text, image |
| Download and run it yourself | Yes (MIT) | No |
| Size | 1.6T parameters, 49B active | Not published |
| Maker says | — | “Our most efficient model for focused, high-volume tasks.” |
| Sources | Prices, Oct 20, 2026 | Prices, Oct 20, 2026 · Description |
Independent tests
Where they place.
Position on each board we follow (1 is best). Epoch AI's and Vectara's scores are shown; the other boards are linked for their own figures.
| Board | DeepSeek-V4-Pro-0813 | GPT-6 Luna |
|---|---|---|
| Epoch Capabilities IndexEpoch AI, Oct 20, 2026 | Not listed | #27156.31 |
| LMArena Agent ArenaLMArena, Oct 19, 2026 | Not listed | #19 |
| Humanity's Last ExamScale AI | #16 | Not listed |
| Vals IndexVals AI, Oct 19, 2026 | #17 | #19 |
| GPQA Diamond (run by Vals AI, archived)Vals AI, Sep 1, 2026 | #17 | Not listed |
| Vectara hallucination testVectara, Oct 16, 2026 | #448.6% | Not listed |
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