Name: Claude Opus 5 vs Claude Opus 5.5
Creator: Benchmark Registry

Shared benchmarks

Shared benchmarks for Claude Opus 5 and Claude Opus 5.5
Benchmark	Claude Opus 5	Claude Opus 5.5
CursorBench 4.0	46.6%	52.5%4.0 · CursorBench Accuracy Cursor 57.8%4.0 · CursorBench Accuracy Cursor
Evaluation details for CursorBench 4.0 The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 46.6% Evaluator Cursor Version CursorBench 4.0 Metric CursorBench Accuracy (percent) Reasoning max Reported September 10, 2026 Source Evaluation source for Claude Opus 5 on CursorBench 4.0 (opens in a new tab) Claude Opus 5.5 Score 52.5% Evaluator Cursor Version CursorBench 4.0 Metric CursorBench Accuracy (percent) Reasoning medium Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on CursorBench 4.0 (opens in a new tab) Score 57.8% Evaluator Cursor Version CursorBench 4.0 Metric CursorBench Accuracy (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on CursorBench 4.0 (opens in a new tab)
DeepSWE 1.1Potentially non-equivalent: Evaluator sets differ.	57.7%1.1 · DeepSWE Pass@1 Anthropic 66.9%1.1 · DeepSWE Pass@1 Anthropic 69.7%1.1 · DeepSWE Pass@1 Anthropic 68.0%1.1 · DeepSWE Pass@1 Anthropic 68.8%1.1 · DeepSWE Pass@1 Anthropic 74.0%1.1 · DeepSWE Pass@1 DataCurve	74.2%1.1 · DeepSWE Pass@1 Anthropic
Potentially non-equivalent · Evaluation details for DeepSWE 1.1 Evaluator sets differ. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 57.7% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning low Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Score 66.9% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning medium Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Score 69.7% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning xhigh Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Score 68.0% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning high Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Score 68.8% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Score 74.0% Evaluator DataCurve Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5 on DeepSWE 1.1 (opens in a new tab) Claude Opus 5.5 Score 74.2% Evaluator Anthropic Version DeepSWE 1.1 Metric DeepSWE Pass@1 (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on DeepSWE 1.1 (opens in a new tab)
Global MMLU Original	92.5%	94.3%
Evaluation details for Global MMLU Original The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 92.5% Evaluator Anthropic Version Global MMLU Original Metric Average accuracy (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Global MMLU Original (opens in a new tab) Claude Opus 5.5 Score 94.3% Evaluator Anthropic Version Global MMLU Original Metric Average accuracy (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Global MMLU Original (opens in a new tab)
Humanity's Last Exam Full set — No tools	47.8%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 56.0%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 56.4%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 54.2%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 56.3%Full set — No tools · Humanity's Last Exam Accuracy Anthropic	59.0%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 64.4%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 59.6%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 52.9%Full set — No tools · Humanity's Last Exam Accuracy Anthropic 62.8%Full set — No tools · Humanity's Last Exam Accuracy Anthropic
Evaluation details for Humanity's Last Exam Full set — No tools The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 47.8% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning low Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 56.0% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning high Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 56.4% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning xhigh Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 54.2% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning medium Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 56.3% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Claude Opus 5.5 Score 59.0% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning medium Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 64.4% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 59.6% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning high Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 52.9% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning low Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — No tools (opens in a new tab) Score 62.8% Evaluator Anthropic Version Humanity's Last Exam Full set — No tools Metric Humanity's Last Exam Accuracy (percent) Reasoning xhigh Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — No tools (opens in a new tab)
Humanity's Last Exam Full set — With tools	64.8%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 64.7%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 56.1%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 63.2%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 61.3%Full set — With tools · Humanity's Last Exam Accuracy Anthropic	63.0%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 63.9%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 66.4%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 67.7%Full set — With tools · Humanity's Last Exam Accuracy Anthropic 57.4%Full set — With tools · Humanity's Last Exam Accuracy Anthropic
Evaluation details for Humanity's Last Exam Full set — With tools The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 64.8% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning xhigh Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 64.7% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 56.1% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning low Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 63.2% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning high Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 61.3% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning medium Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Claude Opus 5.5 Score 63.0% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning medium Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 63.9% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning high Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 66.4% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning xhigh Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 67.7% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning adaptive thinking, max; with tools Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — With tools (opens in a new tab) Score 57.4% Evaluator Anthropic Version Humanity's Last Exam Full set — With tools Metric Humanity's Last Exam Accuracy (percent) Reasoning low Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on Humanity's Last Exam Full set — With tools (opens in a new tab)
MILU Original	92.1%	93.1%
Evaluation details for MILU Original The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 92.1% Evaluator Anthropic Version MILU Original Metric Average accuracy (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on MILU Original (opens in a new tab) Claude Opus 5.5 Score 93.1% Evaluator Anthropic Version MILU Original Metric Average accuracy (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on MILU Original (opens in a new tab)
SWE-bench Multilingual	89.5%	93.9%
Evaluation details for SWE-bench Multilingual The recorded benchmark version, metric, and evaluator sets match. Evaluation methodology is not recorded by the registry. Claude Opus 5 Score 89.5% Evaluator Anthropic Version SWE-bench Multilingual Metric Resolved Tasks (percent) Reasoning max Reported July 24, 2026 Source Evaluation source for Claude Opus 5 on SWE-bench Multilingual (opens in a new tab) Claude Opus 5.5 Score 93.9% Evaluator Anthropic Version SWE-bench Multilingual Metric Resolved Tasks (percent) Reasoning max Reported September 22, 2026 Source Evaluation source for Claude Opus 5.5 on SWE-bench Multilingual (opens in a new tab)