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Benchmark Registry. Humanity's Last Exam Full set — With tools benchmark results. Benchmark identifier: humanitys-last-exam/full-set-with-tools. https://benchmarkregistry.org/benchmarks/humanitys-last-exam/full-set-with-tools. Accessed [YYYY-MM-DD]. Data license: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attribution: Benchmark Registry, a project of Densa Labs — https://benchmarkregistry.org/ (CC BY 4.0). Include the cited record URL and identify any changes.

BibTeX

@misc{br_humanitys_last_exam_full_set_with_tools,
  title = {Humanity's Last Exam Full set — With tools benchmark results},
  publisher = {Benchmark Registry},
  url = {https://benchmarkregistry.org/benchmarks/humanitys-last-exam/full-set-with-tools},
  urldate = {YYYY-MM-DD},
  note = {Benchmark identifier: humanitys-last-exam/full-set-with-tools; data license: CC BY 4.0; access date to be filled by the reader}
}

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Benchmark: Humanity's Last Exam
Evaluated by: Center for AI Safety, Scale AI
Release date: January 24, 2025
Version: Humanity's Last Exam Full set — With tools
Metric: Humanity's Last Exam Accuracy

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Score

Claude Opus 5.5 (medium)

63.0%

www-cdn.anthropic.comHumanity's Last Exam AccuracyReported September 22, 2026AnthropicReport an issue

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Benchmark Registry. Claude Opus 5.5: Humanity's Last Exam Full set — With tools, 63.0% (medium). Registry No. 20015; Record No. 28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05. https://benchmarkregistry.org/benchmarks/humanitys-last-exam/full-set-with-tools?view=history&result=28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05#BR-28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05. Accessed [YYYY-MM-DD]. Data license: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attribution: Benchmark Registry, a project of Densa Labs — https://benchmarkregistry.org/ (CC BY 4.0). Include the cited record URL and identify any changes.

BibTeX

@misc{br_28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05,
  title = {Claude Opus 5.5: Humanity's Last Exam Full set — With tools, 63.0\% (medium)},
  publisher = {Benchmark Registry},
  url = {https://benchmarkregistry.org/benchmarks/humanitys-last-exam/full-set-with-tools?view=history\&result=28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05\#BR-28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05},
  urldate = {YYYY-MM-DD},
  note = {Registry No. 20015; Record No. 28dfff20762763068c297390f28c1d40967ed11f968abc35c584bb9d0ac6bf05; data license: CC BY 4.0; access date to be filled by the reader}
}

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