AnthropicClaude Opus 5VSxAIGrok 4.20
Our Take
We recommend Claude Opus 5 if you need peak intelligence for reasoning and coding tasks, or the 3.3x cheaper Grok 4.20 to optimize your budget for high-volume pipelines. While Claude Opus 5 holds a clear performance lead, it carries a heavy price premium. Choose Claude Opus 5 for complex logic, or Grok 4.20 for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Claude Opus 5 scored 79.2%, while Grok 4.20 scored 51.8%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Claude Opus 5 scored 93.7%, while Grok 4.20 scored 90%.
Cost Efficiency: Grok 4.20 pricing ($2/M input, $6/M output) is 3.3x cheaper than Claude Opus 5 ($5/M input, $25/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)Winner (+27.4%)
79.2%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+3.7%)
93.7%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$10.00Input: $5.00 | Output: $25.00Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
51.8%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
90%graduate-level science QA
Cost & Context
Cost (per 1M tokens)3.3x cheaper
$3.00Input: $2.00 | Output: $6.00Context Window
1.05M tokensFrequently Asked Questions about Claude Opus 5 vs Grok 4.20
Grok 4.20 is cheaper than Claude Opus 5. Grok 4.20 has a blended cost of $3.00/1M tokens, which is about 3.3x cheaper than Claude Opus 5 at $10.00/1M tokens.
Claude Opus 5 is better for coding tasks on this benchmark. It scores 79.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to Grok 4.20 which scores 51.8%.
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