Side-by-side comparison
Gemini 2.5 Flash vs Grok 4.20
Google
Gemini 2.5 Flash
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$0.3000
Output / 1M
$2.5000
| Gemini 2.5 Flash | 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 → | 0.3000 | 1.2500 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 2.5000 | 2.5000 |
Frequently asked questions
Which is cheaper, Gemini 2.5 Flash or Grok 4.20?
Gemini 2.5 Flash is cheaper than Grok 4.20 on a 50/50 input/output blend by about $0.475 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 2.5 Flash or Grok 4.20?
Grok 4.20 has the larger context window at 2M tokens versus 1M tokens for Gemini 2.5 Flash. That means Grok 4.20 can ingest about 1.9x as much text per request.
What is the difference between Gemini 2.5 Flash and Grok 4.20?
Gemini 2.5 Flash 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.