Grok 4 Fast Reasoning
Grok 4 Fast Reasoning is xAI's language model with a 2.0M context window and up to 256K output tokens, available from 3 providers, starting at $0.200 / 1M input and $0.500 / 1M output. The reasoning configuration of Grok 4 Fast, combining cost-efficient multimodal inference with chain-of-thought reasoning over a 2-million-token context.
xAI's language model with a 2.0M context window and up to 256K output tokens, available from 3 providers, starting at $0.200 / 1M input and $0.500 / 1M output. The reasoning configuration of Grok 4 Fast, combining cost-efficient multimodal inference with chain-of-thought reasoning over a 2-million-token context.xai-grok-4-fast-reasoning |
| Language |
| Active |
| xAI |
| 2.0M tokens |
| 256K tokens |
| ImagePdfText |
| Text |
| default |
| · 9 months ago |
35.1#41 |
27.4#58 |
89.7#9 |
0.8#16 |
0.8#18 |
0.2#31 |
0.8#8 |
0.5#59 |
2.78s#302 |
0.4#15 |
0.9#9 |
0.6#22 |
0.2#69 |
0.7#64 |
206.2#13 |
Capabilities
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Output1/5
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Capabilities5/13
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Pricing by Provider
| Provider | Standard | Batch | ||||
|---|---|---|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
 Azure AI Foundry | $0.200 | $0.500 | N/A | — | — | — |
 Vercel AI Gateway | $0.200 | $0.500 | $0.050 | — | — | — |
xAI | $0.200 | $0.500 | $0.050 | $0.100 | $0.250 | $0.025 |
Regional pricing
Provider-specific pricing that varies by region.
Azure AI Foundry
23 regions
| Region | Standard | |
|---|---|---|
| Input $ / 1M | Output $ / 1M | |
| Global | ||
| Global | $0.200 | $0.500 |
| Europe | ||
| France Central (Paris)/ francecentral | $0.220 | $0.550 |
| Germany North (Berlin)/ germanynorth | $0.220 | $0.550 |
| Germany West Central (Frankfurt)/ germanywestcentral | $0.220 | $0.550 |
| Italy North (Milan)/ italynorth | $0.220 | $0.550 |
| North Europe (Ireland)/ northeurope | $0.220 | $0.550 |
| Norway East (Norway)/ norwayeast | $0.220 | $0.550 |
| Poland Central (Warsaw)/ polandcentral | $0.480 | $1.90 |
| Spain Central (Madrid)/ spaincentral | $0.220 | $0.550 |
| Sweden Central (Gävle)/ swedencentral | $0.220 | $0.550 |
| Switzerland North (Zurich)/ switzerlandnorth | $0.480 | $1.90 |
| Switzerland West (Geneva)/ switzerlandwest | $0.480 | $1.90 |
| UK South (London)/ uksouth | $0.480 | $1.90 |
| West Europe (Netherlands)/ westeurope | $0.220 | $0.550 |
| US | ||
| Central US (Iowa)/ centralus | $0.220 | $0.550 |
| East US (Virginia)/ eastus | $0.220 | $0.550 |
| East US 2 (Virginia)/ eastus2 | $0.220 | $0.550 |
| North Central US (Illinois)/ northcentralus | $0.220 | $0.550 |
| South Central US (Texas)/ southcentralus | $0.220 | $0.550 |
| West Central US (Wyoming)/ westcentralus | $0.220 | $0.550 |
| West US (California)/ westus | $0.220 | $0.550 |
| West US 2 (Washington)/ westus2 | $0.220 | $0.550 |
| West US 3 (Phoenix)/ westus3 | $0.220 | $0.550 |
Cost Calculator
Preset:
Compares every provider & tier in USD
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| Grok 4.20 Multi-Agent | 2.0M | $2.00 | $6.00 | Available | |
| Grok 4.20 Multi Agent Beta | 2.0M | $2.00 | $6.00 | Available | |
| Grok 4 20 Non-Reasoning | 2.0M | — | — | Available | |
| Grok 4 20 Reasoning | 2.0M | — | — | Available | |
| Grok 4 20 | — | 131K | $3.00 | $15.00 | Available |
| Grok 4.1 Fast | 2.0M | $0.200 | $0.500 | Available | |
| Grok 4.1 Fast Non-Reasoning | 2.0M | $0.200 | $0.500 | Available | |
| Grok 4.1 Fast Reasoning | 2.0M | $0.200 | $0.500 | Available | |
| Grok 4 Non-Reasoning | 2.0M | $2.00 | $6.00 | Available | |
| Grok 4 Reasoning | 2.0M | $2.00 | $6.00 | Available | |
| Grok 4 Fast Reasoning | 2.0M | $0.200 | $0.500 | Current |