Model profile
xAI

xAI: Grok 4 Fast

xAI: Grok 4 Fast is a budget-priced multimodal generalist from xAI with balanced runtime profile, large context posture, and the clearest fit around long-context research / multimodal.

Best for: Long-context research / MultimodalBalanced latencyLarge contextBudget pricing
Intelligence
35.1

Benchmark blend

Coding
27.4

Dev workflow signal

Context
2000K Tokens

Large

Input Price
$0.20

Budget tier

Decision snapshot
57

xAI: Grok 4 Fast currently reads as a budget multimodal option with large context and a balanced runtime profile.

Overall profile
Selective fit
Best for
Long-context research / Multimodal
Latency tier
Balanced
Price tier
Budget
Source coverage
OpenRouterArtificial AnalysisVision signal

Decision Strip

Decision rail before the raw tables

Core buy-side signals stay in one pass. The rest of the page expands only after intelligence, speed, context, and price are clear.

Intelligence
35.1
35

General reasoning and benchmark headroom.

Limited
Speed
167 tok/s
62

TTFT 3.11s

Competitive
Context
2000K Tokens
100

How much prompt and task state can stay in view.

Above average
Price
$0.20
86

$0.50 output / 1M

Efficient

Editorial Profile

xAI: Grok 4 Fast in one narrative

Positioning, tradeoffs, and fit are consolidated into one read instead of repeating the same story across separate cards.

Selective fitCoding score 27Math score 90Vision enabled

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Identity

xAI multimodal profile

Positioning

Long-context research / Multimodal with large context and balanced runtime.

Cost posture

Efficient spend profile. More comfortable for sustained prompt volume if the capability fit is right.

Strengths
  • Large context headroom supports repo-wide prompts and long research sessions.

  • Vision-capable routing opens up multimodal review and extraction workflows.

Tradeoffs
  • Budget-friendly input pricing is a strength, but raw capability may vary by workload.

  • Latency is balanced rather than ultra-fast, which is fine for most workflows but not the snappiest tier.

Best fit
  • Image-grounded review, multimodal extraction, and UI audit workflows.

  • Long-context summarization, repo analysis, and policy or document review.

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xAI: Grok 4.20

Intelligence
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Context
2000K Tokens
Input Price
$2.00
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Intelligence
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Context
N/A
Input Price
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xAI: Grok 4

Intelligence
41.5
Context
256K Tokens
Input Price
$3.00

Benchmarks

Grouped by job-to-be-done

Only benchmark categories with actual signal are shown. Secondary values stay as simple definitions instead of nested micro-cards.

General intelligence

Broad reasoning, knowledge depth, and flagship benchmark posture.

Intelligence Index
35.1
MMLU Pro
85.0%
GPQA
84.7%
HLE
17.0%
Coding

Software implementation, debugging quality, and coding benchmark signal.

Coding Index
27.4
LiveCodeBench
0.832
SciCode
44.2%
Math

Formal reasoning, structured problem solving, and competition-style math.

Math Index
89.7
AIME 2025
89.7%
Agent / tool use

Long-horizon execution quality and interactive benchmark evidence.

IFBench
50.5%
TAU2
65.8%
TerminalBench Hard
18.9%
LCR
64.7%

Specs & Pricing

Technical snapshot and cost posture

Specs stay neutral, pricing gets emphasis through values rather than extra containers. Raw provider internals remain in metadata at the end.

Technical snapshot
Context Window
2000K Tokens
Vision
Enabled
Modalities
file, image, text
Tokenizer
Grok
Max Completion
30000
Moderation
No
Supported Parameters
include_reasoninglogprobsmax_tokensreasoningresponse_formatseedstructured_outputstemperaturetool_choicetoolstop_logprobstop_p
Input Modalities
fileimagetext
Output Modalities
text
Price architecture
Input
per 1M input tokens
$0.20
Output
per 1M output tokens
$0.50
Blended
AA 3:1 mix
$0.28

This model is relatively efficient on price. It is the easier fit when sustained prompt volume matters.

OR Web Search Price
$0.0050
OR Cache Read
$0.00

Metadata

Raw source tables at the end

Verification details remain available, but the page no longer forces them ahead of the editorial read.