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Grok 4 Fast

SpaceXAIReleased Sep 19, 2025Current

Score basis

Grok 4 Fast is capable in long context; and behind the leaders in reasoning, multimodal tasks, instruction following, factuality, and agentic tasks. Too few results yet to rate coding, safety, math, or multilingual tasks.

Capability profile

Bars show the model's median result as a share of the leading model's, per capability. Select a row to see its results.

Capable1 capability
  1. Long Context−20.7%1 of 3
Limited5 capabilities
  1. Reasoning−33.2%4 of 6
  2. Multimodal−36.1%1 of 6
  3. Instruction Following−38.8%1 of 3
  4. Factuality−39.6%3 of 4
  5. Agentic−40.1%2 of 7
Not rated4 capabilities

Too few results yet to rate Coding, Safety, Math or Multilingual.

Price

$0.20input$0.50outputper million tokens

From Artificial Analysis · All prices

Cheaper than 74% of 329 priced models · 3:1 input-to-output blend, log scale

Evidence

55results on30benchmarks

  • 8 independently verified
  • 32 aggregator
  • 15 vendor-reported

From 8 sources · latest Oct 7, 2026 · How verification works

Research

2 papers reference Grok 4 Fast

Grok 4 Fast benchmark results

55 results on 30 benchmarks, grouped by capability. Each bar is the result as a share of the capability leader's; every result links to its source.

Long Context

CapableFull long context ranking

20.7% behind the leader1 of 3 ranked benchmarks measured

Show 1 more long context resultHide 1 long context result

Reasoning

LimitedFull reasoning ranking

33.2% behind the leader4 of 6 ranked benchmarks measured

Show 7 more reasoning resultsHide 7 reasoning results

Multimodal

LimitedFull multimodal ranking

36.1% behind the leader1 of 6 ranked benchmarks measured

Show 1 more multimodal resultHide 1 multimodal result

Instruction Following

LimitedFull instruction following ranking

38.8% behind the leader1 of 3 ranked benchmarks measured

Show 1 more instruction following resultHide 1 instruction following result

Factuality

LimitedFull factuality ranking

39.6% behind the leader3 of 4 ranked benchmarks measured

Show 2 more factuality resultsHide 2 factuality results

Agentic

LimitedFull agentic ranking

40.1% behind the leader2 of 7 ranked benchmarks measured

Show 2 more agentic resultsHide 2 agentic results

Coding

Not enough dataFull coding ranking

0 of 10 ranked benchmarks measured

Show 2 more coding resultsHide 2 coding results

More results

Benchmarks outside the capability baskets. They are not ranked against a leader.

Show 18 more resultsHide 18 results

Grok 4 Fast: common questions

Who makes Grok 4 Fast?

Grok 4 Fast is made by SpaceXAI.

When was Grok 4 Fast released?

Grok 4 Fast was released on Sep 19, 2025, according to Artificial Analysis.

What is Grok 4 Fast good at?

Grok 4 Fast is capable in long context; and behind the leaders in reasoning, multimodal tasks, instruction following, factuality, and agentic tasks. Too few results yet to rate coding, safety, math, or multilingual tasks.

How much does Grok 4 Fast cost?

Grok 4 Fast costs $0.20 per million input tokens and $0.50 per million output tokens, according to Artificial Analysis. At a mix of three input tokens to one output token, it is cheaper than 74% of the 329 priced models we track.

How many benchmarks has Grok 4 Fast been tested on?

We track 55 results for Grok 4 Fast on 30 benchmarks from 8 sources, 8 of them independently verified. The latest was recorded on Oct 7, 2026.

About this record

Where Grok 4 Fast's numbers come from, and every name it appears under.

Tracked since
Apr 29, 2026
Newest source mention
Jun 23, 2026

Where the results come from

Verification: 55 scores · 8 independently verified · 32 aggregator-attributed · 15 vendor-reported. How these tiers are assigned

From 8 sources on 6 sites. Artificial Analysis supplies 33 of them; the 8 independently verified results come from 4 sites. Bars are coloured by trust tier.

  • artificialanalysis.ai33
  • x.ai8
  • api.llm-stats.com7
  • raw.githubusercontent.com4
  • arcprize.org2
  • datasets-server.huggingface.co1

Also known as

grok-4-fast-non-reasoninggrok 4 (fast reasoning)grok-4-fast (Reasoning)grok-4-fast-reasoninggrok 4 fast (non-reasoning)