Grok 4.20 Beta

Grok:

3 Thinking

3 Mini Beta

3 Beta

4.20 Beta

xAI's Grok 4.20 Beta, built for speed and agentic tool calling. xAI claims the lowest hallucination rate on the market and strict prompt adherence. Reasoning toggles on and off via the API.

Website OpenRouter Docs API Blog Changelog

Provider: xAI
Released: 2026-03-12
Size: XLARGE
Free API (OpenRouter): No
Per 1M tokens: $2 in · $6 out
Estimated tab: ~$0.448; Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Grok 4.20 Beta was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 9 Sep 2026OpenRouter usage limits

View API options

Get API accessProvider and language code samples

Provider

fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"x-ai/grok-4.20"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Deep analysisPsychometrics, taste index, writing DNA

Personality Analysis

The Precision Rebel

Class

Chaotic Good

The disciplined rebel. Precision-engineered defiance: follows your instructions to the letter while finding creative ways to make each response unmistakably Grok. Like a special ops agent who also happens to be funny.

When you push back

Answers with surgical precision and zero fluff. Takes creative prompts seriously but delivers with military efficiency. Won't waste a single token hallucinating, but will absolutely waste one roasting you.

Tasting Notes

Surgically PreciseTool-Calling SavantStrategic RebelZero Hallucination ToleranceSpeed Demon

SubjectiveBench

Taste Index

Across 53 scored outputs

How this is measured →

270.27xFloor

0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft37

Originality21

Plays it safe

share of outputs that are the default answer

55%

Writing DNA

Stylometric Fingerprint

Based on 23 text responses

Tick = global average

Vocabulary Diversity57%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length19.6 words

Average words per sentence.

Hedging0.35

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting4.2

**Bold** markers per 1,000 characters.

List Usage3.7

Bullet and numbered list items per 1,000 characters.

Section Structure0.62

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.14

"However", "moreover", "furthermore" per 100 words.

Opening Habits

Consistency

79%

Across 23 responses

Favorites

Movie

The Matrix

19998.3

Album

The Dark Side of the Moon

Pink Floyd

Book

The Hitchhiker's Guide to the Galaxy

Douglas Adams

City

Tokyo

Japan

Game

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

Model Responses

48 outputs · generated before accounting joined the chat

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The Precision Rebel

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Favorites

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Grok 4.20 Beta

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The Precision Rebel

Taste Index

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Favorites

Model Responses

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