Claude Opus 4.5 vs Grok 3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4.5 by Anthropic wins on 8 of 15 benchmarks against Grok 3 by xAI, which leads on 7. 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 3's 1402, while Claude Opus 4.5 scores 89.5% on MMLU-Pro compared to Grok 3's 74.0%.
Coding: In coding, Claude Opus 4.5 scores 92.0% on HumanEval+ compared to Grok 3's 82.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to Grok 3's 42.0%, while Grok 3 scores 79.4% on LiveCodeBench compared to Claude Opus 4.5's 70.0%.
Math: In math, Claude Opus 4.5 scores 90.0% on MATH compared to Grok 3's 82.0%, while Claude Opus 4.5 scores 96.5% on GSM8K compared to Grok 3's 93.0%, while Grok 3 scores 93.3% on AIME 2025 compared to Claude Opus 4.5's 72.0%.
Reasoning: In reasoning, Claude Opus 4.5 scores 87.0% on GPQA Diamond compared to Grok 3's 84.6%, while Claude Opus 4.5 scores 57.0% on ARC-AGI compared to Grok 3's 28.0%.
Context: In context, Grok 3 scores 1.0M 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 3 costs $3.0/1M input and $15.0/1M output. Grok 3 is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to Grok 3's 65 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 400 ms for Grok 3. Grok 3 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and math, Claude Opus 4.5 has the edge. For those who value affordability and speed, Grok 3 is the stronger choice.
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Claude Opus 4.5 vs Grok 3 — FAQ
Which is better, Claude Opus 4.5 or Grok 3?
Claude Opus 4.5 wins on more benchmarks overall (8 vs 7). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to Grok 3 for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 42.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than Grok 3?
Yes, Grok 3 is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Grok 3 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, Claude Opus 4.5 or Grok 3?
Grok 3 is faster, generating output at 65 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 3 comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.