Grok 4.1 Fast Reasoning vs Grok 4.3
| Spec | Grok 4.1 Fast Reasoning | Grok 4.3 |
|---|---|---|
| Respan Index | 22.7 (#105) | 22.3 (#107) |
| Blended price per 1M | - | $1.25 |
| Context window | 2M | 1M |
| Input / output per 1M | - | $1 / $2 |
| Max output | - | - |
| Input | text | text, vision |
| Released | 2025-11-19 | - |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Grok 4.1 Fast Reasoning | Grok 4.3 |
|---|---|---|
| Coding | 6.2* Grok 4.1 Fast Reasoning | 5.5 Grok 4.3 |
| Agents | 28.8 Grok 4.1 Fast Reasoning | 5.0 Grok 4.3 |
| Reasoning | 21.0 Grok 4.1 Fast Reasoning | 35.8 Grok 4.3 |
| Knowledge & language | 17.1* Grok 4.1 Fast Reasoning | 33.0 Grok 4.3 |
| Human preference | 46.4 Grok 4.1 Fast Reasoning | 49.6 Grok 4.3 |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Grok 4.3 leads on 3 of the 5 benchmarks both report. Higher is better. Each score links to where it was published.
FAQ
Is Grok 4.1 Fast Reasoning better than Grok 4.3?
Grok 4.1 Fast Reasoning scores 22.7 on the Respan Index (#105), ahead of Grok 4.3 at 22.3 (#107). Grok 4.3 leads on 3 of the 5 benchmarks both report.
Which has the larger context window?
Grok 4.1 Fast Reasoning accepts 2M tokens and Grok 4.3 1M tokens.