Legal Agent Benchmark mean criterion-pass rate — Harvey held-out set (LAB criterion-pass (Harvey held-out))

We show this table for reference; we do not rank on it.

Data verified September 27, 202634 confirmed releases in the last 30 daysFollow model changes

Harvey AI's mean criterion-level score on its held-out legal-agent evaluation.

Benchmark score on LAB criterion-pass (Harvey held-out) — September 27, 2026

We compile the LAB criterion-pass (Harvey held-out) rows from provider self-reports. Claude Opus 5 leads the table at 94.1%, followed by Claude Opus 5.5 (91.2%). We do not use these results to rank models overall.

1Proprietary

Claude Opus 5

Anthropic

94.1%

Overall 79.81

2Proprietary

Claude Opus 5.5

Anthropic

91.2%

Overall 86.98Context 1M

2 modelsAgenticCurrentDisplay onlyUpdated September 27, 2026

Benchmark score table (2 models)

Score

Claude Opus 5Anthropic · Closed

94.1%

Claude Opus 5.5Anthropic · Closed

91.2%

About LAB criterion-pass (Harvey held-out)

Year

2026

Tasks

Harvey-held-out legal-agent tasks

Format

Mean criterion-pass rate

Difficulty

Professional legal work

Section 8.13.3 separately reports Harvey's held-out criterion-pass result. It is not merged with Anthropic's internal-harness result.

Claude Opus 5 System Card

Freshness and provenance

Version

LAB criterion-pass (Harvey held-out) 2026

Refresh cadence

Quarterly

Staleness state

Current

Question availability

Public benchmark set

CurrentDisplay only

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 criterion-pass (Harvey held-out) measure?

Harvey AI's mean criterion-level score on its held-out legal-agent evaluation.

Which model scores highest on LAB criterion-pass (Harvey held-out)?

Claude Opus 5 by Anthropic currently leads with a score of 94.1% on LAB criterion-pass (Harvey held-out).

How many models are evaluated on LAB criterion-pass (Harvey held-out)?

2 AI models have been evaluated on LAB criterion-pass (Harvey held-out) on BenchLM.

Compare top models on LAB criterion-pass (Harvey held-out)

Claude Opus 5 vs Claude Opus 5.5

Last updated: September 27, 2026 · BenchLM version LAB criterion-pass (Harvey held-out) 2026

Know when it’s worth switching models

The model to choose, the cheaper alternative, and the release we would wait on.

Read a sample issue

Join 2,000+ readers.

One email each week. Unsubscribe anytime.