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Grok 3 Mini Fast Beta


Grok 3 Mini Fast Beta is xAI logoxAI's language model with a 131K context window, starting at $0.300 / 1M input and $0.500 / 1M output. The beta fast variant of xAI's lightweight Grok 3 Mini reasoning model, designed for rapid logic-based inference with visible thinking traces.
Spec
Canonical IDxai-grok-3-mini-fast-beta
TypeLanguage
StatusActive
CreatorxAIxAI
Providers
Context Window131K tokens
Input ModalitiesText
Output ModalitiesText
Reasoning Effortsdefault

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

ProviderStandardBatch
Input
$ / 1M
Output
$ / 1M
Cache Read
$ / 1M
Input
$ / 1M
Output
$ / 1M
Cache Read
$ / 1M
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grok-3-mini-fast-beta
$0.300$0.500$0.075$0.150$0.250$0.037

Cost Calculator

Preset:
Compares every provider & tier in USD

Versions

VersionReleasedContextInput / 1MOutput / 1MStatus
Grok 3 Mini131K$0.250$0.500Deprecated
Grok 3 Mini Beta131K$0.300$0.500Deprecated
Grok 3 Mini Fast Beta131K$0.300$0.500Available
Grok 3 Mini Fast Beta131K$0.300$0.500Current

Other models

ModelTierReleasedContextInput / 1MOutput / 1M
Grok 4.20 Multi-Agent2.0M$2.00$6.00
Grok 4.20 Multi Agent Beta2.0M$2.00$6.00
Grok 4 20 Non-Reasoning2.0M
Grok 4 20 Reasoning2.0M
Grok 4 20131K$3.00$15.00
Grok 4.1 Fast2.0M$0.200$0.500
Grok 4.1 Fast Non-Reasoning2.0M$0.200$0.500
Grok 4.1 Fast Reasoning2.0M$0.200$0.500
Grok 4 Non-Reasoning2.0M$2.00$6.00
Grok 4 Reasoning2.0M$2.00$6.00

Model IDs