Claude Opus 4.5 vs Grok 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4 by xAI wins on 10 of 18 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 8. 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, Claude Opus 4.5 scores 1468 on Chatbot Arena ELO compared to Grok 4's 1430, while Claude Opus 4.5 scores 89.5% on MMLU-Pro compared to Grok 4's 87.0%.
Coding: In coding, Claude Opus 4.5 scores 92.0% on HumanEval+ compared to Grok 4's 90.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to Grok 4's 72.0%, while Claude Opus 4.5 scores 70.0% on LiveCodeBench compared to Grok 4's 65.0%, while Grok 4 scores 79.6% on Aider Polyglot compared to Claude Opus 4.5's 74.0%, while Claude Opus 4.5 scores 1242 on Design Arena ELO compared to Grok 4's 1073, while Claude Opus 4.5 scores 1259 on Website Arena ELO compared to Grok 4's 1056.
Math: In math, Grok 4 scores 91.0% on MATH compared to Claude Opus 4.5's 90.0%, while Grok 4 scores 97.0% on GSM8K compared to Claude Opus 4.5's 96.5%, while Grok 4 scores 93.0% on AIME 2025 compared to Claude Opus 4.5's 72.0%.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to Claude Opus 4.5's 86.5%, while Claude Opus 4.5 scores 57.0% on ARC-AGI compared to Grok 4's 50.0%.
Context: In context, Grok 4 scores 256K on Context Length compared to Claude Opus 4.5's 200K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while Grok 4 costs $3.0/1M input and $15.0/1M output. Grok 4 is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to Grok 4's 55 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 500 ms for Grok 4. Grok 4 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence, Claude Opus 4.5 has the edge. For those who value math and affordability and speed, Grok 4 is the stronger choice.
View Individual Model Pages
Claude Opus 4.5 vs Grok 4 — FAQ
Which is better, Claude Opus 4.5 or Grok 4?
Grok 4 wins on more benchmarks overall (10 vs 8). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to Grok 4 for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 72.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than Grok 4?
Yes, Grok 4 is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Grok 4 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, Claude Opus 4.5 or Grok 4?
Grok 4 is faster, generating output at 55 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4.5 vs Grok 4 comparison cover?
This comparison covers 18 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.