Legal Agent Benchmark all-pass rate — Anthropic harness (LAB all-pass (Anthropic harness))
We show this table for reference; we do not rank on it.
Strict task success requiring every expert-written legal-work rubric criterion to pass.
Benchmark score on LAB all-pass (Anthropic harness) — November 13, 2026
We compile the LAB all-pass (Anthropic harness) rows from provider self-reports. Claude Opus 5 leads the table at 23.58%. We do not use these results to rank models overall.
1 modelAgenticCurrentDisplay onlyUpdated November 13, 2026
Benchmark score table (1 model)
The one result on this page was reported by the lab that built the model.
| Rank | Model / configuration | Score | Who ran it | Parameters (B) | Open / closed |
|---|---|---|---|---|---|
| 1 | Claude Opus 5AnthropicReported by Anthropic | 23.58% | Reported by Anthropic | Not reported | Closed |
- Lab-reported
- Benchmark-run
- Independent
About LAB all-pass (Anthropic harness)
Year
2026
Tasks
1,235 legal-agent tasks
Format
All-criteria pass rate
Difficulty
Professional legal work
Section 8.13.3 reports five-run performance on 1,235 tasks using Anthropic's reduced-tool reimplementation, production safeguards, and fallback to Opus 4.8 on classifier refusal.
Freshness and provenance
Version
LAB all-pass (Anthropic harness) 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does LAB all-pass (Anthropic harness) measure?
Strict task success requiring every expert-written legal-work rubric criterion to pass.
Which model scores highest on LAB all-pass (Anthropic harness)?
Claude Opus 5 by Anthropic currently leads with a score of 23.58% on LAB all-pass (Anthropic harness).
How many models are evaluated on LAB all-pass (Anthropic harness)?
1 AI models have published results on LAB all-pass (Anthropic harness) in the BenchLM catalog.
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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