#155 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
X AI
Release: 2025-11-19
Tested on: 2026-05-08 13:50
x-ai/grok-4.1-fast::none
~500B total (~50B active)MoEClosedEstimated
(medium)
(none)
Summary
Grok 4.1 Fast scores 4.4 on AI BENCHY and ranks #155. It has 10.0 reliability, a 22.8% pass rate, $0.008 total cost, and 1.62s average response time.
What makes Grok 4.1 Fast unique: It stands out most in Domain specific, where it ranks #3, while Instructions following is its weakest area at #15. It is notably fast compared with similar models.
Archived model: this model is no longer updated or tested on new tests.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.
4.4
Consistency
8.8
10.0
Total Output Tokens
1,723
Total Input Tokens
36,608
Input Price
$0.202 / 1M
Output Price
$0.202 / 1M
Flaky tests
3
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 13:50 Re-test | 3.8 | 10.0 | $0.008 ↓ | Compare | |
| 2026-05-08 13:50 Re-test | 3.8 | 10.0 | $0.008 ↓ | 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 |
Run comparison
| Run | Benchmark coverage | Score | Consistency | Reliability | Tests Correct | Flaky tests | Total Output Tokens | Total Input Tokens | Total Cost | Response Time (avg) |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-05-08 13:50 · Re-test | 57/57 attempts | 4.4 | 8.8 | 10.0 | 3/19 | 3 | 1,723 | 36,608 | $0.008 | 1.62s |
| 2026-05-08 13:50 · Suite changed | 57/57 attempts | 4.4 | 8.8 | 10.0 | 3/19 | 3 | 1,733 | 0 | $0.009 | 1.67s |
| Difference | — | 0.0 | 0.0 | 0.0 | 0 | 0 | -10 | +36608 | -$0.001 | -50ms |
Price History
Historical pricing data for this model from OpenRouter.
| Date | Input Price | Output Price |
|---|---|---|
| 2026-06-04 14:42 | $0.202 / 1M | $0.202 / 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 | 3.2 | 10.0 | |
| Coding | 5.3 | 3.4 | |
| 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 |