Grok 4 Fast
DeprecatedGrok 4 Fast is xAI's language model with a 131K context window and up to 30K output tokens, available from 2 providers, starting at $0.2 / 1M input and $0.5 / 1M output. A cost-efficient multimodal LLM from xAI with a 2M token context window, available in both reasoning and non-reasoning flavors.
| Benchmarks | |
|---|---|
| Intelligence Index | #257 |
| Math Index | #179 |
| MMLU-Pro | #205 |
| GPQA | #327 |
| HLE | #410 |
| LiveCodeBench | #189 |
| IFBench | #288 |
| Time to First Token | #303 |
| SciCode | #273 |
| AIME 2025 | #179 |
| LCR | #320 |
| TerminalBench Hard | #206 |
| TAU2 | #169 |
| Output TPS | #533 |
Capabilities
Input2/5
Text✓
Image✓
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities4/13
Reasoning✓
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling·
Structured Outputs✓
Native JSON Schema✓
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | |
|---|---|---|
| Input $ / 1M | Output $ / 1M | |
| $0.2 | $0.5 | |
| $5.00 | $25.00 | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| Grok 4.6 | 500K | $2.00 | $6.00 | Available | |
| Grok 4.5 | 500K | $2.00 | $6.00 | Available | |
| 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 | $1.25 | $2.50 | Deprecated | |
| Grok 4 Fast | 131K | $0.200 | $0.500 | Current |