Grok 4 Reasoning is xAI's language model with a 2.0M context window and up to 256K output tokens, starting at $0.2 / 1M input and $0.5 / 1M output. The reasoning-enabled variant of xAI's Grok 4 Fast, combining chain-of-thought capabilities with cost-efficient multimodal processing and a 2M token context window.
Specifications
Canonical IDxai-grok-4-reasoning
TypeLanguage
StatusDeprecated
CreatorxAIxAI
Providers
Context Window2.0M tokens
Max Output256K tokens
Input ModalitiesImagePDFText
Output ModalitiesText
Reasoning Effortsdefault
Release Date · 1 year ago
Deprecation Date
Benchmarks
Intelligence Index
#193
Math Index
#39
MMLU-Pro
#36
GPQA
#104
HLE
#151
LiveCodeBench
#24
IFBench
#180
Time to First Token
#335
SciCode
#109
AIME 2025
#39
LCR
#111
TerminalBench Hard
#160
TAU2
#162
Output TPS
#565

Capabilities

Input3/5
Text✓
Image✓
Audio·
Video·
PDF✓
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities5/13
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
ProviderStandard
Input
$ / 1M
Output
$ / 1M
Azure AI Foundry logo
Azure AI Foundry
azure_ai/grok-4-fast-reasoning
$0.2$0.5

Cost Calculator

US Dollar ($)
Preset:

Versions

VersionReleasedContextInput / 1MOutput / 1MStatus
Grok 4.7524K$2.00$6.00Available
Grok 4.6524K$2.00$6.00Available
Grok 4.5500K$2.00$6.00Available
Grok 4.31.0M$1.25$2.50Available
Grok 4.3 Batch1.0M$1.00$2.00Available
Grok 4.202.0M$1.25$2.50Available
Grok 4.20 Multi-Agent2.0M$1.25$2.50Available
Grok 4.20 Multi-Agent Beta2.0M$1.25$2.50Available
Grok 4.20 Non-Reasoning2.0M$1.25$2.50Deprecating
Grok 4.20 Multi-Agent2.0M$1.00$2.00Available
Grok 4 Reasoning2.0M$0.200$0.500Current

Model IDs

azure_ai/grok-4-fast-reasoning
grok-4-fast-reasoning
xai-grok-4-reasoning
xai/grok-4-fast-reasoning