Side-by-side comparison
Gemini 3 Flash Preview vs Grok 4.20
Google
Gemini 3 Flash Preview
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$0.5000
Output / 1M
$3.0000
| Gemini 3 Flash Preview | Grok 4.20 | |
|---|---|---|
| Provider | xAI | |
| Context window Maximum tokens (input + output) the model can process in a single request. Glossary → | 1,048,576 | 2,000,000 |
| Capabilities Optional capabilities the model advertises: vision (images), tools (function calling), json_mode (structured output). | vision, tools, json_mode | vision, tools, json_mode |
| Input $ / 1M tokens Cost for tokens you send (prompt + context). Cheaper side highlighted. Glossary → | 0.5000 | 1.2500 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 3.0000 | 2.5000 |
Frequently asked questions
Which is cheaper, Gemini 3 Flash Preview or Grok 4.20?
Gemini 3 Flash Preview is cheaper than Grok 4.20 on a 50/50 input/output blend by about $0.125 per 1M tokens. Exact savings depend on your input-vs-output ratio — use the cost calculator on this page for a workload-specific estimate.
Which has a larger context window, Gemini 3 Flash Preview or Grok 4.20?
Grok 4.20 has the larger context window at 2M tokens versus 1M tokens for Gemini 3 Flash Preview. That means Grok 4.20 can ingest about 1.9x as much text per request.
What is the difference between Gemini 3 Flash Preview and Grok 4.20?
Gemini 3 Flash Preview comes from Google; Grok 4.20 comes from xAI. They differ in pricing, context window, and supported capabilities — see the side-by-side table on this page for the exact figures, refreshed nightly.