Benchmark Almanac

BigLaw Bench

GPT-5.4 91% leads since April 2026
Fading

Models review legal documents and receive rubric scores for substantive accuracy and editing quality.

Anthropic reports Claude Opus 4.7 at 90.9% high effort.

Made by
Harvey
Released
April 2026
Kind
Law
Level
Research frontier
Scored
Graded by a model
Answers
Open-ended
Tasks
Kept private
Strongest model tested
GPT-5.4 #27 on the capability index
Last in a launch post
April 2026, dropped after it saturated
Last model added
April 2026
3
Models scored in lab cards
3
Launch posts list it, from 2 labs

GPT-5.4 leads with 91% among models released by April 2026

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

The newest model with a score here came out in April 2026, and nobody has reported a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:

  1. 91.0 GPT-5.4
  2. 90.9 Claude Opus 4.7
  3. 90.2 Claude Opus 4.6
  1. 1 GPT-5.4 91%
  2. 2 Claude Opus 4.7 90.9%
  3. 3 Claude Opus 4.6 90.2%

Source: Labs’ model cards

#ModelScoreSettingDateSource
1 GPT-5.4 91% Mar 2026 Lab model card
2 Claude Opus 4.7 90.9% Apr 2026 Lab model card
3 Claude Opus 4.6 90.2% Feb 2026 Lab model card

Number one over time

Lab claims count from the day the card came out, independent runs from the model’s release.

OpenAI
Lab claims Passed 85% in Apr 2026, by GPT-5.4
GPT-5.4 91%

Source: Labs’ model cards

Anthropic’s own number for Claude Opus 4.6 passed 85% in February 2026

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) GPT-5.4 0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) GPT-5.4

Source: Labs’ model cards

Labs headline it less often now, last in April 2026

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

Anthropic
OpenAI
DateLaunch postScoreAs the post writes it
Apr 16, 2026 Claude Opus 4.7 90.9 BigLaw Bench, 90.9% at high effort
Mar 5, 2026 GPT-5.4 91 BigLaw Bench (GPT-5.4)
Feb 5, 2026 Claude Opus 4.6 90.2 BigLaw Bench 90.2%, quoted from Harvey in the launch post ("40% perfect scores and 84% above 0.8")

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