Moondream 3.1 vs SpaceXAI Grok 4.20
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Moondream 3.1 is 1.8× cheaper at a typical mix of 3 input tokens per output token.
- Grok 4.20 accepts longer prompts: 1.9M vs 32K tokens.
- Moondream 3.1 is the newer model (released 2026-10-15).
| Moondream 3.1 | Grok 4.20 | |
|---|---|---|
| Vendor | Moondream | SpaceXAI |
| Released | 2026-10-15 | 2026-03-31 |
| Input / 1M | $0.30 | $1.25 |
| Output / 1M | $2.50 | $2.50 |
| Cached input / 1M | — | $0.20 |
| Blended / 1M (3:1) | $0.85 | $1.56 |
| Context | 32K | 1.9M |
| Max output | 4K | 1.7M |
| Accepts | text, image | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 4 |
| Cheapest provider, output | $2.50 | $2.50 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Moondream 3.1
$55.50 per month$1.85 per day
Grok 4.20
$113 per month$3.75 per day
Moondream 3.1 saves $57.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Moondream 3.1 with