Side-by-side comparison
Grok 4 Fast vs Gemini 2.5 Flash Lite Preview 09-2025
Google
Gemini 2.5 Flash Lite Preview 09-2025
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$0.1000
Output / 1M
$0.4000
| Grok 4 Fast | Gemini 2.5 Flash Lite Preview 09-2025 | |
|---|---|---|
| Provider | xAI | |
| Context window Maximum tokens (input + output) the model can process in a single request. Glossary → | 2,000,000 | 1,048,576 |
| 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 → | 0.2000 | 0.1000 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 0.5000 | 0.4000 |
Frequently asked questions
Which is cheaper, Grok 4 Fast or Gemini 2.5 Flash Lite Preview 09-2025?
Gemini 2.5 Flash Lite Preview 09-2025 is cheaper than Grok 4 Fast on a 50/50 input/output blend by about $0.1 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, Grok 4 Fast or Gemini 2.5 Flash Lite Preview 09-2025?
Grok 4 Fast has the larger context window at 2M tokens versus 1M tokens for Gemini 2.5 Flash Lite Preview 09-2025. That means Grok 4 Fast can ingest about 1.9x as much text per request.
What is the difference between Grok 4 Fast and Gemini 2.5 Flash Lite Preview 09-2025?
Grok 4 Fast comes from xAI; Gemini 2.5 Flash Lite Preview 09-2025 comes from Google. They differ in pricing, context window, and supported capabilities — see the side-by-side table on this page for the exact figures, refreshed nightly.