#256 Grok 4.1 Fast
medium
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
X AI
Release: 2025-11-19
Tested on: 2026-05-08 13:52
x-ai/grok-4.1-fast::medium
~500B total (~50B active)MoEClosedEstimated
(medium)
(none)
Summary
Grok 4.1 Fast scores 4.7 on AI BENCHY and ranks #256. It has 10.0 reliability, a 53.0% pass rate, $0.069 total cost, and 23.85s average response time.
What makes Grok 4.1 Fast unique: It stands out most in Anti-AI Tricks, where it ranks #1, while Tool Calling is its weakest area at #11.
Archived model: this model is no longer updated or tested on new tests.
Model facts
Researched on 2026-08-12
- Parameters
- ~500B total (~50B 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.
4.7
Consistency
6.3
10.0
Total Output Tokens
98,340
Total Input Tokens
42,845
Input Price
$0.484 / 1M
Output Price
$0.484 / 1M
Flaky tests
6
Flaky tests had mixed outcomes across runs (at least one pass and one fail).
Hamster playing table tennis
Prompt: Create a detailed SVG illustration of a hamster playing table tennis.
Run history
| Tested on | Score | Reliability | Tests Correct | Total Cost | Compare |
|---|---|---|---|---|---|
| 2026-05-08 13:52 Re-test | 4.7 | 10.0 | $0.069 ↑ | Current run | |
| 2026-05-08 13:52 Re-test | 4.7 | 10.0 | $0.069 ↑ | Compare | |
| 2026-05-08 13:52 Re-test | 6.5 | 10.0 | $0.069 ↑ | Compare | |
| 2026-05-08 13:52 Re-test | 6.5 | 10.0 | $0.058 | Compare | |
| 2026-05-08 13:52 Suite changed | 6.5 | 10.0 | $0.058 | Compare | |
| 2026-04-11 01:44 First recorded run | 6.7 | N/A | $0.056 | Compare |
Price History
Historical pricing data for this model from OpenRouter.
| Date | Input Price | Output Price |
|---|---|---|
| 2026-06-04 15:40 | $0.484 / 1M | $0.484 / 1M |
Charts
Choose the first model, then click a second model to open a side-by-side page.
Top Models by Score
Score vs Total Cost
Response Time (avg)
Score vs Response Time (avg)
Total Output Tokens
Score vs Total Output Tokens
Category Breakdown
| Category | Score | Consistency | Tests Correct |
|---|---|---|---|
| Anti-AI Tricks | 8.7 | 7.9 | |
| Coding | 7.8 | 4.0 | |
| Combined | 5.0 | 5.0 | |
| Data parsing and extraction | 10.0 | 10.0 | |
| Domain specific | 5.8 | 4.4 | |
| General Intelligence | 4.2 | 9.9 | |
| Instructions following | 6.5 | 10.0 | |
| Puzzle Solving | 5.3 | 7.2 | |
| Tool Calling | 2.8 | 1.6 | |
| Trivia | 3.0 | 10.0 |