Benchmark Almanac

prinzbench

GPT-5.6 Sol Pro 91.0 leads since July 2026
Not in model cards

Models research fact patterns under U.S. statutes and regulations and hunt for obscure public information online. 33 private questions run three times give a score out of 99.

25 legal research and 8 search questions. Zvi covers it often. The author last updated the board on July 18th, 2026. On November 3rd, 2026 the repository's README was replaced with an unrelated AI timeline, so we read the board from the July 18 version.

Made by
prinz-ai
Released
January 2026
Kind
Law
Level
Expert
Scored
Graded by people
Answers
Open-ended
Tasks
Kept private
Strongest model tested
Claude Fable 5 #11 on the capability index
Last model added
July 2026
Scores refreshed
November 12th, 2026
27
Entries on its own leaderboard, 26 models we track

GPT-5.6 Sol Pro leads with 91.0 among models released by July 2026

Best score per entry from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best. Names in gray aren't in our model list: fine-tunes, agent systems, products and older models. They don't count toward leaders.

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

27 entries. Scroll sideways for the rest.

  1. 91.0 GPT-5.6 Sol Pro
  2. 82.0 GPT-5.5 Pro
  3. 79.0 GPT-5.4 Pro
  4. 74.0 GPT-5.5
  5. 69.0 GPT-5.4
  6. 56.0 Claude Fable 5
  7. 52.0 GPT-5.2
  8. 52.0 GPT-5.3 Codex
  9. 50.0 Gemini 3.1 Pro
  10. 47.0 Kimi K3
  11. 43.0 Grok 4.20
  12. 42.0 Claude Opus 4.8
  13. 36.0 Gemini 3 Flash
  14. 35.0 Gemini 3 Pro
  15. 35.0 Kimi K2.5
  16. 31.0 Muse Spark
  17. 30.0 GLM-5.2
  18. 25.0 qwen-q3-max
  19. 25.0 Grok 4.1
  20. 25.0 Claude Opus 4.7
  21. 23.0 Grok 4
  22. 23.0 DeepSeek-V4-Pro
  23. 22.0 Kimi K2 Thinking
  24. 20.0 Claude Sonnet 4.5
  25. 19.0 Claude Opus 4.6
  26. 14.0 Claude Opus 4.5
  27. 8.00 Claude Sonnet 4.6
  1. 1 GPT-5.6 Sol Pro 91.0
  2. 2 GPT-5.5 Pro extended 82.0
  3. 3 GPT-5.4 Pro extended 79.0
  4. 4 GPT-5.5 thinking heavy 74.0
  5. 5 GPT-5.4 xhigh 69.0
  6. 6 Claude Fable 5 max 56.0
  7. 7 GPT-5.2 thinking extended 52.0
  8. 8 GPT-5.3 Codex high 52.0
  9. 9 Gemini 3.1 Pro 50.0
  10. 10 Kimi K3 47.0
  11. 11 Grok 4.20 43.0
  12. 12 Claude Opus 4.8 max 42.0
  13. 13 Gemini 3 Flash 36.0
  14. 14 Gemini 3 Pro 35.0
  15. 15 Kimi K2.5 thinking 35.0
  16. 16 Muse Spark 31.0
  17. 17 GLM-5.2 30.0
  18. 18 qwen-q3-max 25.0
  19. 19 Grok 4.1 thinking 25.0
  20. 20 Claude Opus 4.7 25.0
  21. 21 Grok 4 23.0
  22. 22 DeepSeek-V4-Pro 23.0
  23. 23 Kimi K2 Thinking 22.0
  24. 24 Claude Sonnet 4.5 20.0
  25. 25 Claude Opus 4.6 19.0
  26. 26 Claude Opus 4.5 14.0
  27. 27 Claude Sonnet 4.6 8.00

Source: Official prinzbench leaderboard

#EntryScoreSettingDateSource
1 GPT-5.6 Sol Pro 91.0 Jul 2026 Official leaderboard
2 GPT-5.5 Pro 82.0 extended Apr 2026 Official leaderboard
3 GPT-5.4 Pro 79.0 extended Mar 2026 Official leaderboard
4 GPT-5.5 74.0 thinking heavy Apr 2026 Official leaderboard
5 GPT-5.4 69.0 xhigh Mar 2026 Official leaderboard
6 Claude Fable 5 56.0 max Jun 2026 Official leaderboard
7 GPT-5.2 52.0 thinking extended Dec 2025 Official leaderboard
8 GPT-5.3 Codex 52.0 high Feb 2026 Official leaderboard
9 Gemini 3.1 Pro 50.0 Feb 2026 Official leaderboard
10 Kimi K3 47.0 Jul 2026 Official leaderboard
11 Grok 4.20 43.0 Feb 2026 Official leaderboard
12 Claude Opus 4.8 42.0 max May 2026 Official leaderboard
13 Gemini 3 Flash 36.0 Dec 2025 Official leaderboard
14 Gemini 3 Pro 35.0 Nov 2025 Official leaderboard
15 Kimi K2.5 35.0 thinking Jan 2026 Official leaderboard
16 Muse Spark 31.0 Apr 2026 Official leaderboard
17 GLM-5.2 30.0 Jun 2026 Official leaderboard
18 qwen-q3-max 25.0 Official leaderboard
19 Grok 4.1 25.0 thinking Nov 2025 Official leaderboard
20 Claude Opus 4.7 25.0 Apr 2026 Official leaderboard
21 Grok 4 23.0 Jul 2025 Official leaderboard
22 DeepSeek-V4-Pro 23.0 Apr 2026 Official leaderboard
23 Kimi K2 Thinking 22.0 Nov 2025 Official leaderboard
24 Claude Sonnet 4.5 20.0 Sep 2025 Official leaderboard
25 Claude Opus 4.6 19.0 Feb 2026 Official leaderboard
26 Claude Opus 4.5 14.0 Nov 2025 Official leaderboard
27 Claude Sonnet 4.6 8.00 Feb 2026 Official leaderboard

4 models have held number one on the official leaderboard since its release in January 2026

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

OpenAI
Own leaderboard Not tested since Jul 2026
GPT-5.6 Sol Pro 91.0

Source: Official prinzbench leaderboard

Scores over time

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

On the benchmark’s own leaderboard
0.00 20.0 40.0 60.0 80.0 100.0 2026 0.00 20.0 40.0 60.0 80.0 100.0 2026

Source: Official prinzbench leaderboard

No lab model card reports it yet

We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark.

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