Grok 3 Fast
Grok 3 Fast is xAI's language model with a 131K context window, available from 3 providers, starting at $5.00 / 1M input and $25.00 / 1M output. A high-speed variant of xAI's Grok 3 flagship LLM optimized for enterprise tasks like data extraction, coding, and summarization with reduced latency.
Capabilities
Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities3/13
Reasoning·
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search✓
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching✓
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | ||
|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
| $5.00 | $25.00 | N/A | |
| $5.00 | $25.00 | N/A | |
| $5.00 | $25.00 | $1.25 | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| Grok 4.3 | 1.0M | $1.25 | $2.50 | Available | |
| Grok 4.20 | 2.0M | $1.25 | $2.50 | Available | |
| Grok 4.20 Multi-Agent | 2.0M | $1.25 | $2.50 | Available | |
| Grok 4.20 Multi-Agent Beta | 2.0M | $1.25 | $2.50 | Available | |
| Grok 4.20 Non-Reasoning | 2.0M | $1.25 | $2.50 | Available | |
| Grok 4.20 Reasoning | 2.0M | $1.25 | $2.50 | Available | |
| Grok 4.1 Reasoning | 2.0M | $0.200 | $0.500 | Deprecated | |
| Grok 4.1 Fast | 2.0M | $0.200 | $0.500 | Deprecated | |
| Grok 4.1 Fast Non-Reasoning | 2.0M | $0.200 | $0.500 | Deprecated | |
| Grok 4 Fast | 131K | $0.200 | $0.500 | Deprecated | |
| Grok 3 Fast | 131K | $5.00 | $25.00 | Current |