Gemini 3 Flash Preview vs Grok 4.20
API pricing, benchmark indices and specs — updated 19 October 2026.
google · A · API-only
Input / 1M
$0.50
Output / 1M
$3.00
AA index
26.3
proprietary · 1M context
x-ai · B · API-only
Input / 1M
$1.25
Output / 1M
$2.50
AA index
25.7
proprietary · 2M context
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | Gemini 3 Flash Preview | Grok 4.20 |
|---|---|---|
| Deployment | API-only (closed weights) | API-only (closed weights) |
| Parameters | n/a — API-only | n/a — API-only |
| Architecture | n/a — API-only | n/a — API-only |
| Context length | 1,048,576 | 2,000,000 |
| Licence | Proprietary | Proprietary |
| Commercial use | Per API terms | Per API terms |
| Languages | n/a — API-only | n/a — API-only |
| Downloads 30d | n/a — API-only | n/a — API-only |
| Downloads all time | n/a — API-only | n/a — API-only |
| Quantizations on the Hub | n/a — API-only | n/a — API-only |
| Gated | n/a — API-only | n/a — API-only |
| First seen on the Hub | n/a — API-only | n/a — API-only |
| API input price / 1M tokens | $0.50 | $1.25 |
| API output price / 1M tokens | $3.00 | $2.50 |
| Est. cost per 1M input + 1M output tokens | $3.50 | $3.75 |
| Cached input / 1M tokens | $0.05 | $0.20 |
| AA Intelligence Index | 26.3 | 25.7 |
| AA Coding Index | — | — |
| AA Agentic Index | — | — |
| Max output tokens | 65,536 | 1,800,000 |
| API providers | 2 | 1 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
Gemini 3 Flash Preview
$3.50
Grok 4.20
$3.75
Gemini 3 Flash Preview is 1.1× cheaper at list price.