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xAI Released March 31, 2026 Synced Apr 19, 2026

xAI: Grok 4.20

Grok 4.20 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...

Tool useVisionReasoning

Why it stands out

Offers a 2000K-token context window, enabling full-document and multi-file analysis without chunking.
Combines tool use with reasoning — a strong baseline for agentic and multi-step workflows.
Multimodal input (vision) extends it beyond text-only workflows.

What to watch

No benchmark score currently tracked — evaluate using task-specific testing alongside pricing and capability data.

Release timeline

Tracked events for xAI: Grok 4.20.

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release

xAI: Grok 4.20 entered the tracked catalog

March 31, 2026

Grok 4.20 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)

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xAI: Grok 4.20 Multi-Agent

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xAI: Grok 4.20 Multi-Agent Beta

Grok 4.20 Multi-Agent Beta is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in par

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xAI: 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 hall

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xAI: Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M conte

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Recent changes

LaunchMar 31

xAI launched xAI: Grok 4.20

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