Grok 4

xAI

flagship

Capabilities

VisionToolsCodeExtended ThinkingStructured OutputMultilingual

Strengths

Very strong reasoning
Real-time data access (via X)
Competitive with Opus/GPT-5.4 on benchmarks

Weaknesses

Most expensive xAI model
Controversial provider
Newer API ecosystem

Pricing

Input / 1M tokens

Output / 1M tokens

$15

Context window

256k

Transparency

Open weights

0.0 / 10

Open training data

0.0 / 10

Open methodology

3.0 / 10

Licence openness

3.0 / 10

Provider disclosure

2.0 / 10

FMTI company score

140.0 / 10

Composite:1.6 / 10

xAI FMTI 14 — lowest tier. Closed weights. Minimal disclosure.

Sustainability

Inference energy

N/A

Training footprint

N/A

Provider infrastructure

1.5 / 10

Composite:1.5 / 10

Memphis Colossus running on gas turbines (no emission permits as of 2025). 2GW capacity planned. 88-acre solar array planned but not built. 168 Tesla Megapacks for battery storage. Among worst sustainability profiles.

Task Fitness

question answering

88%

code

90%

mathematics

91%

business communication

72%

analysis

92%

extraction

88%

long-form generation

85%

research

64%

reasoning

92%

summarisation

85%

translation

82%

conversation

82%