Claude Opus 4 vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4.1 Fast by xAI wins on 11 of 16 benchmarks against Claude Opus 4 by Anthropic, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Grok 4.1 Fast scores 1482 on Chatbot Arena ELO compared to Claude Opus 4's 1375, while Grok 4.1 Fast scores 87.0% on MMLU-Pro compared to Claude Opus 4's 83.0%.
Coding: In coding, Claude Opus 4 scores 90.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while Claude Opus 4 scores 72.5% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while Grok 4.1 Fast scores 62.0% on LiveCodeBench compared to Claude Opus 4's 60.0%, while Claude Opus 4 scores 1171 on Design Arena ELO compared to Grok 4.1 Fast's 1114, while Claude Opus 4 scores 1177 on Website Arena ELO compared to Grok 4.1 Fast's 1147.
Math: In math, Grok 4.1 Fast scores 89.0% on MATH compared to Claude Opus 4's 86.0%, while Grok 4.1 Fast scores 96.0% on GSM8K compared to Claude Opus 4's 95.0%.
Reasoning: In reasoning, Claude Opus 4 scores 79.6% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while Grok 4.1 Fast scores 48.0% on ARC-AGI compared to Claude Opus 4's 45.0%.
Context: In context, Grok 4.1 Fast scores 256K on Context Length compared to Claude Opus 4's 200K.
Pricing Comparison
Claude Opus 4 costs $15.0/1M input tokens and $75.0/1M output tokens, while Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output. Grok 4.1 Fast is the more affordable option for API usage.
Speed Comparison
Claude Opus 4 generates output at 50 tok/s compared to Grok 4.1 Fast's 120 tok/s, and the time to first token is 550 ms for Claude Opus 4 versus 200 ms for Grok 4.1 Fast. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing coding, Claude Opus 4 has the edge. For those who value general intelligence and math and affordability and speed, Grok 4.1 Fast is the stronger choice.
View Individual Model Pages
Claude Opus 4 vs Grok 4.1 Fast — FAQ
Which is better, Claude Opus 4 or Grok 4.1 Fast?
Grok 4.1 Fast wins on more benchmarks overall (11 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4 compare to Grok 4.1 Fast for coding?
Claude Opus 4 is better for coding, scoring 72.5% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4 cheaper than Grok 4.1 Fast?
Yes, Grok 4.1 Fast is cheaper. Claude Opus 4 costs $15.0/1M input and $75.0/1M output tokens. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens.
Which is faster, Claude Opus 4 or Grok 4.1 Fast?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4 vs Grok 4.1 Fast comparison cover?
This comparison covers 16 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.