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#166

Grok 4.1 Fast

X AI Release: 2025-11-19 Tested on: 2026-05-08 13:50 x-ai/grok-4.1-fast::none
(medium) (none)

Summary

Grok 4.1 Fast scores 4.0 on AI BENCHY and ranks #166. It has 10.0 reliability, a 20.6% pass rate, $0.008 total cost, and 1.62s average response time.

What makes Grok 4.1 Fast unique: Its total benchmark cost is unusually low for its score range. It is notably fast compared with similar models.

Archived model: this model is no longer updated or tested on new tests.

Score

4.0

Consistency

7.9

Reliability

10.0

Total Cost (Current Price)

$0.008 ↓ -5.6%

Tested at: $0.009

Total Output Tokens

1,723

Total Input Tokens

36,608

Input Price

$0.202 / 1M

Output Price

$0.202 / 1M

Tests Correct

Wrong Tests: 16

Attempt pass rate: 20.6%

Flaky tests

3

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

Response Time (avg)

1.62s

Response Time (max): 5.51s

Response Time (total): 19.48s

Wrong answer: 13 Did not follow instructions: 3

Generation showcase

Hamster playing table tennis

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

#166 Grok 4.1 Fast

none
Grok 4.1 Fast is deprecated. xAI recommends switching to Grok 4.3 (https://openrouter.ai/x-ai/grok-4.3)
Cost
$0.000
Time
0.1s
Tokens
0 tok

Run history

Tested on Score Reliability Tests Correct Total Cost Compare
2026-05-08 13:50 Re-test 4.4 10.0 $0.008 ↓ Current run
2026-05-08 13:50 Re-test 4.4 10.0 $0.009 Compare
2026-05-08 13:50 Suite changed 4.4 10.0 $0.009 Compare
2026-04-11 01:44 First recorded run 4.5 N/A $0.009 Compare

Price History

Historical pricing data for this model from OpenRouter.

Date Input Price Output Price
2026-06-04 15:40 $0.202 / 1M $0.202 / 1M

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 4.1 FastnonevsGemini 3.5 FlashhighGrok 4.1 FastnonevsGemini 3 Flash PreviewmediumGrok 4.1 FastnonevsNemotron 3 Ultra 550b A55bmediumFree AvailableGrok 4.1 FastnonevsGPT-5.5low

Category Breakdown

Category Score Consistency Tests Correct
Anti-AI Tricks 3.2 10.0
Coding 1.8 1.1
Combined 3.0 10.0
Data parsing and extraction 10.0 10.0
Domain specific 5.9 7.2
General Intelligence 4.4 9.9
Instructions following 3.0 10.0
Puzzle Solving 3.0 10.0
Tool Calling 2.8 1.6
Trivia 3.0 10.0

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