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xAI

SpaceXAI: Grok 4.20

x-ai/grok-4.20

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Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. Learn more in our docs

Input
$1.25

/ 1M tokens

Output
$2.5

/ 1M tokens

Context window
2M

tokens

Limits

Context

2,000,000

tokens

Max output

1,800,000

90% of the context window

Model facts

Author

xAI

Tokenizer

Grok

Modality

Text + Image + File -> Text

Knowledge cutoff

2025-09-01

Created

Mar 31, 2026

Publication status

Hugging Face: unavailableLicense: not publishedParameter count: not published

Modalities

Input · TextInput · ImageInput · FileOutput · Text

Generation controls

Include reasoningLogprobsMax tokensReasoningResponse formatSeedStructured outputsTemperatureTool choiceToolsTop logprobsTop p

Capability scores

25.7
Intelligence index

Better than 63% of models compared

Agent tasks

Category performance

Web apps
Top 67%

1136 Elo

49.7% win

HTML slides
Top 49%

1180 Elo

45.7% win

Mobile apps
Top 88%

1087 Elo

45.4% win

Full-stack apps
Top 79%

1054 Elo

41.1% win

Godot games
Top 88%

1089 Elo

38.5% win

Android apps
Top 93%

1060 Elo

35.0% win

Creative tasks

Category performance

SVG
Top 52%

1164 Elo

52.4% win

3D
Top 48%

1193 Elo

52.1% win

Data visualization
Top 48%

1219 Elo

52.0% win

Code
Top 44%

1223 Elo

51.8% win

Websites
Top 42%

1231 Elo

51.8% win

Games
Top 47%

1195 Elo

50.1% win

UI components
Top 49%

1199 Elo

49.0% win

ASCII art
Top 50%

1177 Elo

48.2% win