Grok 4 Fast (Reasoning)

Release Date: 9/19/2025

Benchmarked by Vals Logo
Vals Index

Latest advancement in cost-efficient reasoning models with unified architecture. Handles complex requests with deep chain-of-thought reasoning. Features 2M token context window and native tool use.

Avg. Accuracy

57.34%

Latency

197.43s

Cost (In/Out)

0.2 / 0.5

Context Window

2M

Max Output Tokens

2M

Input Modality

Benchmarks

Accuracy

Rankings

Vals Index

0.0%

15/ 31

Vals Multimodal Index

0.0%

16/ 19

CaseLaw (v2)

0.0%

11/ 59

CorpFin

0.0%

2/ 78

Finance Agent

0.0%

25/ 57

MortgageTax

0.0%

51/ 57

SAGE

0.0%

30/ 36

TaxEval (v2)

0.0%

3/ 88

Vibe Code Bench

0.0%

15/ 15

AIME

0.0%

13/ 79

GPQA

0.0%

8/ 80

IOI

0.0%

16/ 41

LiveCodeBench

0.0%

22/ 87

LegalBench

0.0%

33/ 101

MedQA

0.0%

29/ 87

MGSM

0.0%

33/ 75

MMLU Pro

0.0%

41/ 80

MMMU

0.0%

24/ 54

SWE-bench

0.0%

25/ 46

Terminal-Bench

0.0%

35/ 47

Terminal-Bench 2.0

0.0%

16/ 31

Academic Benchmarks
Proprietary Benchmarks (contact us to get access)

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