xAI: Grok 4.20 Beta

xAIID: x-ai/grok-4.20-beta

Grok 4.20 Beta is xAI's newest flagship model 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](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

Pricing per 1M Tokens

Input (Prompt)$2.00
Output (Completion)$6.00
Cache Read$0.20
Cache WriteFree
ImageN/A

Specifications

Context Length2M
Max Output TokensN/A
Input ModalitiesText + Image
Output ModalitiesText
TokenizerGrok
Instruct TypeN/A
Top Provider Context2M
Top Provider Max OutputN/A
ModeratedNo

Compare this model

See how xAI: Grok 4.20 Beta stacks up against other models.

vs xAI: Grok 4.20 Multi-Agent Betavs xAI: Grok 4.1 Fastvs xAI: Grok 4 Fastvs xAI: Grok Code Fast 1vs xAI: Grok 4

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xAI: Grok 4.20 Multi-Agent Beta
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xAI: Grok 4.1 Fast
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xAI: Grok 4 Fast
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xAI: Grok Code Fast 1
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xAI: Grok 4
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Last updated: March 23, 2026

First tracked: March 23, 2026