Grok 4.20

xAI · Released March 2026 · Knowledge cutoff September 2025

Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

It belongs to xAI's Grok family, where the 4.x generation leads on reasoning and Grok Build targets software engineering.

Facts and pricing

Provider

xAI

Context window

2M tokens

Input price

13.8 credits / 1M tokens ($1.25 raw)

Output price

27.5 credits / 1M tokens ($2.50 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

Try Grok 4.20 now

What Grok 4.20 is best for

• Balanced everyday work: writing, questions, brainstorming and summarization
• Very long documents and codebases: a 2M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a general purpose model like Grok 4.20:

• Help me outline a talk about what I learned this year
• Compare these two paragraphs and tell me which is clearer and why
• Draft a polite reply declining this invitation
• Explain this concept with a concrete everyday analogy

xAI family

Frequently asked questions

What is Grok 4.20?

Grok 4.20 is an AI model by xAI. Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

How much does Grok 4.20 cost on Zeplik?

Input tokens cost 13.8 credits per million and output tokens 27.5 credits per million (1 credit = $0.10; the raw provider rates are $1.25 and $2.50 per million). New accounts start with free credits.

How long can a conversation with Grok 4.20 be?

Grok 4.20 has a 2M-token context window (2,000,000 tokens), which covers the conversation plus any documents you attach.

Does Grok 4.20 support images and tools?

Grok 4.20 accepts image input and supports tool calling.

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