Side-by-side comparison
Grok 4.1 Fast vs Gemini 2.5 Flash Lite
xAI
Grok 4.1 Fast
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$0.2000
Output / 1M
$0.5000
Google
Gemini 2.5 Flash Lite
👁 Vision
🔧 Tools
{} JSON
Input / 1M
$0.1000
Output / 1M
$0.4000
| Grok 4.1 Fast | Gemini 2.5 Flash Lite | |
|---|---|---|
| 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 4.1 Fast or Gemini 2.5 Flash Lite?
Gemini 2.5 Flash Lite is cheaper than Grok 4.1 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 4.1 Fast or Gemini 2.5 Flash Lite?
Grok 4.1 Fast has the larger context window at 2M tokens versus 1M tokens for Gemini 2.5 Flash Lite. That means Grok 4.1 Fast can ingest about 1.9x as much text per request.
What is the difference between Grok 4.1 Fast and Gemini 2.5 Flash Lite?
Grok 4.1 Fast comes from xAI; Gemini 2.5 Flash Lite 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.