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Grok 4.1 Fast

Deprecates

Grok 4.1 Fast is xAI logoxAI's language model with a 2.0M context window and up to 30K output tokens, available from 3 providers, starting at $0.200 / 1M input and $0.500 / 1M output. xAI's fast agentic tool-calling LLM with a 2M context window, excelling at real-world use cases like customer support and deep research.
Spec
Canonical IDxai-grok-4-1-fast
TypeLanguage
StatusDeprecating
CreatorxAIxAI
Providers
Context Window2.0M tokens
Max Output30K tokens
Input ModalitiesAudioImageText
Output ModalitiesText
Reasoning Effortsdefault
Release Date · 6 months ago
Deprecation Date
Intelligence Index
23.6
#183
Coding Index
19.5
#176
Math Index
34.3
#169
MMLU-Pro
0.7
#172
GPQA
0.6
#223
HLE
0.1
#277
LiveCodeBench
0.4
#172
IFBench
0.4
#258
Time to First Token
0.43s
#210
SciCode
0.3
#223
AIME 2025
0.3
#169
LCR
0.2
#230
TerminalBench Hard
0.1
#161
TAU2
0.6
#134
Output TPS
91.5
#129

Capabilities

Input3/5
Text
Image
Audio
Video·
PDF·
Output1/5
Text
Image·
Audio·
Video·
Embedding·
Capabilities6/13
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

ProviderStandardBatch
Input
$ / 1M
Output
$ / 1M
Cache Read
$ / 1M
Web Search
$ / query
Input
$ / 1M
Output
$ / 1M
Cache Read
$ / 1M
OpenRouter logo
OpenRouter
x-ai/grok-4.1-fast
$0.200$0.500$0.050$0.0050
xAI logo
xAI
grok-4-1-fast
$0.200$0.500$0.050N/A$0.100$0.250$0.025
Oracle Cloud (OCI) logo
Oracle Cloud (OCI)
oci/xai.grok-4.1-fast
$5.00$25.00N/AN/A

Cost Calculator

Preset:
Compares every provider & tier in USD

Versions

VersionReleasedContextInput / 1MOutput / 1MStatus
Grok 4.31.0M$1.25$2.50Available
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$2.50Available
Grok 4.20 Reasoning2.0M$1.25$2.50Available
Grok 4.1 Fast2.0M$0.200$0.500Current
Grok 4 Fast2.0M$0.200$0.500Deprecating
Grok 4 Fast Non-Reasoning2.0M$0.200$0.500Available
Grok 4256K$3.00$15.00Deprecating
Grok 4 Reasoning2.0M$0.200$0.500Available

Model IDs