How much does Grok 4.20 cost?

Grok 4.20 costs $1.25 per million input tokens and $2.50 per million output tokens on standard pricing. A workload of 20M input and 5M output tokens a month is about $38.

What is the context length of Grok 4.20?

Grok 4.20 accepts up to 2,000,000 tokens (2M) of input and can return up to 1,800,000 tokens in one response.

Does Grok 4.20 support tool calling and structured outputs?

Yes, Grok 4.20 supports function/tool calling and structured (JSON) outputs. Supported tools: Function calling, Structured outputs, JSON mode, Reasoning, Log probabilities, Deterministic seed, Prompt caching.

What inputs and outputs does Grok 4.20 support?

Grok 4.20 accepts Text, Image, PDF as input and produces Text as output.

When was Grok 4.20 released?

Grok 4.20 was released by xAI in 2026-03-31.

Grok 4.20

grok-4.20

API Provider site

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... Built by xAI.

Prices updated recently

Input price

$1.25

per 1M tokens · Standard

Output price

$2.50

per 1M tokens · Standard

Input limit

tokens

Output limit

1.8M

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF

Compare

Grok 4.20 price history

2 price records since 9/25/2026

Grok 4.20 cost calculator

Input20M tokens

Output5M tokens

$38/month

Standard pricing

Overview

What is Grok 4.20?

Grok 4.20 is a text & reasoning and vision model from xAI. 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... Its 2M context window and $1.25 input price make it a candidate for quality-focused production applications.

Image understandingDocument analysisContent workflowsClassification

Benchmarks

Grok 4.20 benchmarks & speed

How Grok 4.20 scores on standardized evaluations, and where it lands among every model we track.

25.7

Intelligence Index

Better than 65% of 153 models

120tok/s

Output speed

Better than 64% of 119 models

Reasoning

GPQA Diamond

91.1%

Graduate-level scientific reasoning · top 21%

HLE

34.5%

Humanity's Last Exam · top 32%

Latency & design

Time to first token: 19.5s

Independent scores from Artificial Analysis and DesignArena · updated 10/5/2026. Higher is better; ranks compare against every model we track with that score.

Rates

Grok 4.20 pricing

Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

Input · Standard

$1.25

Per 1M tokens

Cached input · Standard

$0.20

Per 1M tokens

Capabilities

Grok 4.20 Tools

Tools available when using Grok 4.20 through supported provider APIs.

Function calling

Supported

Structured outputs

Supported

JSON mode

Supported

Reasoning

Supported

Built-in web search

Not supported

Log probabilities

Supported

Deterministic seed

Supported

Parallel tool calls

Not supported

Prompt caching

Supported

Strengths and limitations

Strengths

Measured results (AA Intelligence 25.7) position it for demanding production work.
2M context supports large documents, repositories and extended conversations.
Supports text & reasoning and vision workloads in one model.

Limitations

Real-world cost still depends on prompt length, response length and provider-specific billing rules.
Large context capacity does not guarantee consistent retrieval across the entire prompt.
Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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