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xAI

SpaceXAI: Grok 4.3

x-ai/grok-4.3

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Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Reasoning can be configured between none/low/medium/high (default low) effort levels. It supports a 1 million token context window with no output token limit, making it well-suited for long-document analysis, deep research, and multi-step agentic tasks. Pricing is tiered: requests exceeding 200k total tokens are billed at a higher rate.

Input
$1.25

/ 1M tokens

Output
$2.5

/ 1M tokens

Context window
1M

tokens

Limits

Context

1,000,000

tokens

Max output

900,000

90% of the context window

Model facts

Author

xAI

Tokenizer

Grok

Modality

Text + Image + File -> Text

Created

Apr 30, 2026

Reasoning

Default LowHighMediumLowNone

Publication status

Hugging Face: not mappedLicense: not publishedParameter count: not published

Modalities

Input · TextInput · ImageInput · FileOutput · Text

Generation controls

Include reasoningLogprobsMax tokensReasoningReasoning effortResponse formatSeedStructured outputsTemperatureTool choiceToolsTop logprobsTop p

Capability scores

15.5
Agentic index

Better than 40% of models compared

42.2
Coding index

Better than 36% of models compared

24.9
Intelligence index

Better than 61% of models compared

Agent tasks

Category performance

Web apps
Top 73%

1118 Elo

43.2% win

Mobile apps
Top 97%

1055 Elo

33.6% win

pptxslides
Top 93%

1071 Elo

32.5% win

agenticslides(python pptx)
Top 94%

1068 Elo

32.4% win

Agentic slides
Top 94%

1072 Elo

31.9% win

Agentic HTML slides
Top 94%

1066 Elo

31.8% win

Additional published result

  • Agentic slides (HTML)

    1066 Elo · Rank #9 · 31.7% win · Top 94%

Slide decks
Top 93%

1072 Elo

30.8% win

Agentic games
Top 98%

1007 Elo

28.8% win

HTML slides
Top 97%

1008 Elo

28.4% win

Full-stack apps
Top 94%

1006 Elo

28.1% win

Android apps
Top 99%

976 Elo

22.7% win

Godot games
Top 98%

914 Elo

20.7% win

Creative tasks

Category performance

Data visualization
Top 57%

1180 Elo

45.2% win

UI components
Top 52%

1193 Elo

45.0% win

Websites
Top 49%

1197 Elo

44.2% win

Code
Top 51%

1189 Elo

43.8% win

Games
Top 52%

1176 Elo

43.4% win

ASCII art
Top 77%

1131 Elo

43.1% win

3D
Top 63%

1126 Elo

40.9% win

SVG
Top 80%

1080 Elo

37.2% win