Claude 3.5 Sonnet (upgraded) vs Grok 4.1 Fast
Anthropic Claude 3.5 Sonnet (upgraded) | SpaceXAI Grok 4.1 Fast | |
|---|---|---|
| Overview | ||
| Company | Anthropic | SpaceXAI |
| Release date | Oct 22 2024 | Nov 19 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 19% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 49% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 393 days before Grok 4.1 Fast | |
Which is better: Claude 3.5 Sonnet (upgraded) or Grok 4.1 Fast?
Claude 3.5 Sonnet (upgraded) and Grok 4.1 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3.5 Sonnet (upgraded) shipped 393 days before Grok 4.1 Fast, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet (upgraded) and Grok 4.1 Fast don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
Grok 4.1 Fast was released by SpaceXAI on Nov 19 2025.
Other comparisons
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