Google Gemini 3.5 Flash Lite 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
- Gemini 3.5 Flash Lite is 1.8× cheaper at a typical mix of 3 input tokens per output token.
- Grok 4.20 accepts longer prompts: 1.9M vs 1M tokens.
- Gemini 3.5 Flash Lite is the newer model (released 2026-07-21).
| Gemini 3.5 Flash Lite | Grok 4.20 | |
|---|---|---|
| Vendor | SpaceXAI | |
| Released | 2026-07-21 | 2026-03-31 |
| Input / 1M | $0.30 | $1.25 |
| Output / 1M | $2.50 | $2.50 |
| Cached input / 1M | $0.03 | $0.20 |
| Blended / 1M (3:1) | $0.85 | $1.56 |
| Context | 1M | 1.9M |
| Max output | 66K | 1.7M |
| Accepts | text, image, file, audio, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 8 | 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 | Operational |
Cost calculator
Gemini 3.5 Flash Lite
$55.50 per month$1.85 per day
Grok 4.20
$113 per month$3.75 per day
Gemini 3.5 Flash Lite saves $57.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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