Grok 4.3

xAI · May 2026

A fast all-rounder for chat, code and hard problems. Reads longer documents than 4.5, but isn't built for long multi-step jobs.

Best for: Coding and deep reasoning
Superseded by: Grok 4.5

Context window
1,000,000 tokens
≈ 750,000 words · about 3,000 pages

Modalities

TextInput and output
ImageInput only
AudioNot supported
VideoNot supported

Reasoning effort

Default: Low.

None
Low
Medium
High
X-High

Features

StreamingSupported
Function callingSupported
Structured outputsSupported
Fine-tuningNot supported

Tools

Web searchSupported
Image generationSupported
Code interpreterSupported
Hosted shellSupported
Apply patchNot supported
SkillsNot supported
Computer useNot supported
Tool searchNot supported

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