#57 xAI: 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: 2026-04-11 01:44
x-ai/grok-4.1-fast::medium
~500B total (~50B active)MoEClosedEstimated
(medium)
(none)
Summary
Grok 4.1 Fast scores 6.7 on AI BENCHY and ranks #57. It has N/A reliability, a 64.8% pass rate, $0.056 total cost, and 23.88s average response time.
What makes Grok 4.1 Fast unique: It stands out most in Combined, where it ranks #1, while Coding is its weakest area at #18. Its total benchmark cost is unusually low for its score range.
Archived model: this model is no longer updated or tested on new tests.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.
6.7
Consistency
7.2
N/A
$0.056
Total Output Tokens
93,308
Total Input Tokens
0
Input Price
$0.200 / 1M
Output Price
$0.500 / 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 ↑ | Compare | |
| 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 | Current run |
Run comparison
| Run | Benchmark coverage | Score | Consistency | Reliability | Tests Correct | Flaky tests | Total Output Tokens | Total Input Tokens | Total Cost | Response Time (avg) |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-04-11 01:44 · First recorded run | 54/54 attempts | 6.7 | 7.2 | N/A | 9/18 | 6 | 93,308 | 0 | $0.056 | 23.88s |
| 2026-05-08 13:52 · Suite changed | 57/57 attempts | 6.5 | 7.3 | 10.0 | 9/19 | 6 | 98,704 | 0 | $0.058 | 24.01s |
| Difference | — | +0.2 | -0.1 | 0 | 0 | -5396 | 0 | -$0.003 | -137ms |
Benchmark coverage differs: 54/54 attempts (Target: 3 repeats per test) versus 57/57 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.
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 | 2.3 | 1.1 | |
| Combined | 10.0 | 10.0 | |
| Data parsing and extraction | 10.0 | 10.0 | |
| Domain specific | 5.8 | 4.4 | |
| General Intelligence | 4.2 | 9.9 | |
| Instructions following | 6.6 | 10.0 | |
| Puzzle Solving | 5.3 | 7.2 | |
| Tool Calling | 2.8 | 1.6 |