RedlineBench
Agent acts as counsel at one turn of a SaaS contract negotiation and returns tracked-change redlines. Three LLM judges grade attorney-written rubrics.
Attorneys wrote a branching tree of golden responses. The counterparty playbook is hidden from the agent. Built without client data.
- Made by
- Crosby Intelligence + micro1
- Released
- June 2026
- Kind
- Law
- Level
- Expert
- Scored
- Graded by a model
- Answers
- Open-ended
- Tasks
- All public
- Strongest model tested
- Claude Fable 5 #11 on the capability index
- Last model added
- June 2026
- Scores refreshed
- November 12th, 2026
GPT-5.5 leads with 50.5% among models released by June 2026
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.
The newest model with a score here came out in June 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- Claude Fable 5.2
-
Gemini 4 Carbon - GPT-6 Astra
- Claude Opus 5.5
- and 14 more
- 1 GPT-5.5 50.5%
- 2 Claude Fable 5 47.3%
- 3 Gemini 3.5 Flash 45.1%
- 4 Claude Opus 4.8 44.4%
Source: Official RedlineBench leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | GPT-5.5 | 50.5% | Apr 2026 | Official leaderboard | |
| 2 | Claude Fable 5 | 47.3% | Jun 2026 | Official leaderboard | |
| 3 | Gemini 3.5 Flash | 45.1% | May 2026 | Official leaderboard | |
| 4 | Claude Opus 4.8 | 44.4% | May 2026 | Official leaderboard |
Number one over time
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official RedlineBench leaderboard
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Official RedlineBench 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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