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 reads more at once: a context window of 1M tokens against 256K.
- Gemma 4 31B can be downloaded and run on your own machine; GPT-6 Luna can't.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| Gemma 4 31B | GPT-6 Luna | |
|---|---|---|
| Made by | Google · US | OpenAI · US |
| Released | Apr 2, 2026 | Sep 22, 2026 |
| Price per 1M tokens | Free to download; hosts set prices | $0.10 in / $0.50 out |
| Context window | 256K | 1M |
| Takes in | text, image, video | text, image |
| Download and run it yourself | Yes (Apache 2.0) | No |
| Size | 30.7B (dense) parameters | Not published |
| Maker says | “Today, we are introducing Gemma 4 — our most intelligent open models to date.” | “Our most efficient model for focused, high-volume tasks.” |
| Sources | Prices, Oct 20, 2026 · Description | 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.
More comparisons