xAI: Grok 4.20 Beta

Reasoning Tool Calling Attachments

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)

Providers 1

Released Mar 12, 2026

Input Modalities image, text

Output Modalities text

Tarsk Use coding

Available Providers (1)

Provider	Model ID	Input Cost	Output Cost	Context	Max Output	Docs
Kilo Gateway	`x-ai/grok-4.20-beta`	$2.00/MTok	$6.00/MTok	2M	32.8K

Capabilities

Reasoning

Tool Calling

Attachments

Open Weights

Structured Output