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 9 of 16 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 6. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
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%.
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, both score 87.0% on GPQA Diamond, 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.
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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 (9 vs 6). 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 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.