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.
- Level
- Expert Specialists with years of training, often over hours of work
- Scored
- Graded by a model A language model scores each response, usually against a rubric.
- Answers
- Open-ended Free-form text, documents, designs or media judged as a whole.
GPT-5.5 leads with 50.5% among models released by Jun 2026
Best score per model from the benchmark's own leaderboard, read on 2 Nov 2026. Where a model ran with several settings or harnesses, we keep its best.
The newest model with a score here came out in Jun 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- GPT-6 Astra
- Claude Opus 5.5
- GPT-6.1 Terra
- GPT-6.1 Sol
- and 13 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%
| # | 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.
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
No lab model card reports it yet
We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark.
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