Benchmark Almanac

Ivo-micro1 ContractBench

Gemini 4 Argon 64% leads since October 2026
Not in model cards

Models review contracts and return redlines across 350 attorney-written tasks in 35 scenarios and five agreement types. Tasks cover first review and replies to a counterparty.

Scores whether models intervene where several attorneys did, plus a surgicality index of targeted inline edits. Attorneys scored 63.5% on surgicality.

Made by
micro1 with Ivo
Released
October 2026
Kind
Law
Level
Expert
Scored
Graded by a model
Answers
Open-ended
Tasks
All public
Strongest model tested
GPT-6 Astra #3 on the capability index
Last model added
September 2026
Scores refreshed
November 12th, 2026
8
Models scored on its own leaderboard

Gemini 4 Argon leads with 64%

Best score per model from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best.

  1. 64.0 Gemini 4 Argon
  2. 58.3 Grok 4.7
  3. 58.1 Claude Opus 5.5
  4. 57.1 Kimi K3
  5. 55.0 GLM-5.3
  6. 55.0 Gemini 3.8 Flash
  7. 48.4 DeepSeek-V4-Pro
  8. 45.6 GPT-6 Astra
  1. 1 Gemini 4 Argon 64%
  2. 2 Grok 4.7 58.3%
  3. 3 Claude Opus 5.5 58.1%
  4. 4 Kimi K3 57.1%
  5. 5 GLM-5.3 55%
  6. 6 Gemini 3.8 Flash 55%
  7. 7 DeepSeek-V4-Pro 48.4%
  8. 8 GPT-6 Astra 45.6%

Source: Official Ivo-micro1 ContractBench leaderboard

#ModelScoreSettingDateSource
1 Gemini 4 Argon 64% Sep 2026 Official leaderboard
2 Grok 4.7 58.3% Sep 2026 Official leaderboard
3 Claude Opus 5.5 58.1% Sep 2026 Official leaderboard
4 Kimi K3 57.1% Jul 2026 Official leaderboard
5 GLM-5.3 55% Aug 2026 Official leaderboard
6 Gemini 3.8 Flash 55% Sep 2026 Official leaderboard
7 DeepSeek-V4-Pro 48.4% Apr 2026 Official leaderboard
8 GPT-6 Astra 45.6% Sep 2026 Official leaderboard

Number one over time

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

Google DeepMind
Own leaderboard 1 leader
Gemini 4 Argon 64%

Source: Official Ivo-micro1 ContractBench 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 Best so far
0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Gemini 4 Argon Grok 4.7 Kimi K3 DeepSeek-V4-Pro 0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Gemini 4 Argon Kimi K3

Source: Official Ivo-micro1 ContractBench 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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