Claude Sonnet 4 vs Grok Code Fast 1
Anthropic Claude Sonnet 4 | SpaceXAI Grok Code Fast 1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | SpaceXAI |
| Release date | May 22 2025 | Aug 28 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. | 30% | — |
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. | 72.7% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.4% | — |
| Timeline | ||
| Release gap | Claude Sonnet 4 shipped 98 days before Grok Code Fast 1 | |
Which is better: Claude Sonnet 4 or Grok Code Fast 1?
Claude Sonnet 4 and Grok Code Fast 1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Sonnet 4 shipped 98 days before Grok Code Fast 1, 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 Sonnet 4 and Grok Code Fast 1 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Sonnet 4 was released by Anthropic on May 22 2025.
Grok Code Fast 1 was released by SpaceXAI on Aug 28 2025.
Other comparisons
Claude Sonnet 4 vs GPT-5.6 SolGrok Code Fast 1 vs GPT-5.6 SolClaude Sonnet 4 vs Gemini 3.5 FlashGrok Code Fast 1 vs Gemini 3.5 FlashClaude Sonnet 4 vs Muse Spark 1.1Grok Code Fast 1 vs Muse Spark 1.1Claude Sonnet 4 vs DeepSeek-V4-ProGrok Code Fast 1 vs DeepSeek-V4-ProClaude Sonnet 4 vs Mistral Medium 3.5Grok Code Fast 1 vs Mistral Medium 3.5Claude Sonnet 4 vs Kimi K2.7 CodeGrok Code Fast 1 vs Kimi K2.7 Code