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#77

Grok 4.20

X AI Release: 2026-03-31 Tested on: 2026-05-22 00:32 x-ai/grok-4.20::medium
~1T total (~100B active)MoEClosedEstimated
(medium) (none)

Summary

Grok 4.20 scores 6.7 on AI BENCHY and ranks #77. It has 10.0 reliability, a 61.7% pass rate, $0.832 total cost, and 19.09s average response time.

What makes Grok 4.20 unique: It stands out most in Domain specific, where it ranks #2, while Coding is its weakest area at #17.

Identity note

Grok 4.20 Beta was the preview version of Grok 4.20.

Model facts

Researched on 2026-08-12

Estimated
Parameters
~1T total (~100B active)
Architecture
MoE
Availability
Closed
License
-

Best estimate from public evidence; the vendor did not disclose every value. xAI does not disclose the architecture or count.

Parameter source Availability source

Score

6.7

Consistency

8.0

Reliability

10.0

Total Cost (Current Price)

$0.832

Total Output Tokens

158,105

Total Input Tokens

0

Input Price

$1.250 / 1M

Output Price

$2.500 / 1M

Tests Correct

Wrong Tests: 10

Attempt pass rate: 61.7%

Flaky tests

5

Flaky tests had mixed outcomes across runs (at least one pass and one fail).

Response Time (avg)

19.09s

Response Time (max): 105.80s

Response Time (total): 381.86s

Wrong answer: 6 Did not follow instructions: 2 Extra formatting: 1 No answer: 1

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#77 xAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 tok

Run history

Tested on Score Reliability Tests Correct Total Cost Compare
2026-08-14 02:57 Re-test 7.0 10.0 $0.805 ↓ Compare
2026-07-16 23:07 New test added 7.1 10.0 $0.777 ↓ Compare
2026-06-04 14:17 New test added 7.1 10.0 $0.609 ↓ Compare
2026-05-22 00:32 Suite changed 6.7 10.0 $0.832 Current run
2026-05-08 15:32 Suite changed 6.9 10.0 $0.756 Compare
2026-04-11 01:44 First recorded run 7.0 N/A $0.743 Compare

This run used a different benchmark suite. Keep suite changes in mind when reading historical movement.

Charts

Choose the first model, then click a second model to open a side-by-side page.

Total Output Tokens

Score vs Total Output Tokens

Quick Compare

Grok 4.20mediumvsMercury 2mediumGrok 4.20mediumvsSeed-2.0-MinimediumGrok 4.20mediumvsGPT-5.5noneGrok 4.20mediumvsKimi K2.5mediumGrok 4.20mediumvsGLM 5.1mediumGrok 4.20mediumvsKAT-Coder-Pro V2.5mediumGrok 4.20mediumvsDeepSeek V3.2mediumGrok 4.20mediumvsQwen3.7 FlashmediumGrok 4.20mediumvsGPT-5.6 SolnoneGrok 4.20mediumvsSeed-2.0-Codehigh

Category Breakdown

Category Score Consistency Tests Correct
Anti-AI Tricks 8.2 7.9
Coding 4.1 1.8
Combined 10.0 10.0
Data parsing and extraction 10.0 10.0
Domain specific 5.3 10.0
General Intelligence 3.9 2.6
Instructions following 7.3 6.0
Puzzle Solving 7.7 10.0
Tool Calling 3.0 10.0
Trivia 3.0 10.0

Compared models