#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Archived model: this model is no longer updated or tested on new tests.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 |
| 2026-04-11 01:44 · First recorded run | 54/54 attempts | 4.5 | 8.7 | N/A | 3/18 | 3 | 1,721 | 0 | $0.009 | 1.76s |
| Difference | — | -0.1 | +0.1 | 0 | 0 | +2 | +36608 | -$0.001 | -135ms |
Benchmark coverage differs: 57/57 attempts (Target: 3 repeats per test) versus 54/54 attempts (Target: 3 repeats per test). Totals and repeat-sensitive metrics are not directly comparable.
These two runs used different benchmark suites, so the deltas reflect both model changes and suite changes.
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 |