Benchmark suiteLatest source data: Jul 14, 2026Checked: July 15, 2026

Grok 4 Fast Reasoning.

A model-level benchmark profile for Grok 4 Fast Reasoning, combining Arena category ranks, suite indexes, commercial price and speed data, SWE-bench status, and lab context.

xAI lab page

Lab

xAI

Proprietary

Coverage

33%

3 of 9 tracked signals

Best Arena rank

#94

WebDev Arena

Best suite

#95

Reasoning / 81

Model profile

Benchmark signal map.

This view treats missing values as coverage gaps, then puts every available score, rank, cost, and speed signal into the same visual hierarchy.

Analyst view

Grok 4 Fast Reasoning is strongest on reasoning.

33% coverage

Its best composite result is rank #95 in the reasoning view, with a 81 reasoning proxy. The strongest raw Arena signal is WebDev Arena at rank #94 with 935 public votes.

Best current lane

Reasoning

#95 / 81 reasoning proxy

Strongest raw signal

Code

#94, 1151 score

Commercial posture

$0.275

Not listed first token / Not listed

Coverage gaps

Vision ArenaSearch ArenaDocument ArenaLatencyOutput speedSWE-bench

Profile completeness

3 of 9 signals matched

33%

Arena categories

2/5

Code, Text

Commercial match

Live

Grok 4 Fast (Reasoning)

SWE-bench

Not listed

No confident software benchmark row

Raw identifier

grok-4-fast-reasoning

Reasoning

Performance cockpit

Public benchmark scores

Arena rows show score, public rank, confidence interval, vote count, and publish date. Missing rows stay visible as coverage gaps.

Text Arena

Arena category

1,404#120

1399-1409 CI

18,710 votes

Jul 14, 2026

Arena public leaderboard dataset

WebDev Arena

Arena category

1,151#94

1128-1174 CI

935 votes

Jul 12, 2026

Arena public leaderboard dataset

Vision Arena

Arena category

Not listed

No confident public Arena row for this category.

Coverage gap

Search Arena

Arena category

Not listed

No confident public Arena row for this category.

Coverage gap

Document Arena

Arena category

Not listed

No confident public Arena row for this category.

Coverage gap

SWE-bench Verified

Software issue resolution

Not listed

No confident SWE-bench row matched to this model.

Coverage gap

Cost and speed

Commercial profile

Price, latency, and throughput are only shown when a confident commercial source row is matched.

Blended price

$0.275

USD / 1M tokens

Input price

$0.200

USD / 1M input tokens

Output price

$0.500

USD / 1M output tokens

Latency

Not listed

Median time to first token

Output speed

Not listed

Median generation speed

Matched source row

Grok 4 Fast (Reasoning)

Suite position

Composite ranks by benchmark lens.

These views combine available public signals into purpose-specific indexes. A missing card means the model lacks enough source coverage for that lens.

Value

Quality, price, latency, and output speed

#9967

value index

blended / 1M tokens$0.275

time to first tokenNot listed

output speedNot listed

Coding

Code Arena, SWE-bench, and output speed

#10711

coding index

Code Arena rank #941,151