Prove the lift · AI model performance evaluation

claude-opus-4-6 vs claude-opus-4-8

+18-point lift for claude-opus-4-6 on legal-research-qa

Test summary

This benchmark evaluates claude-opus-4-6 against claude-opus-4-8 on the legal-research-qa v1 dataset (5 rows), scored by an LLM-as-judge (gpt-4o-mini). claude-opus-4-6 reached a 53% pass rate versus 35% for claude-opus-4-8 — a +18-point lift.

Base model
claude-opus-4-8
via anthropic · 35% pass rate
Refined model
claude-opus-4-6
via anthropic · 53% pass rate · 0.5s p95
Base pass rate
35%
Refined pass rate
53%
Refined p95
0.5s
Est. tokens saved
5.2K
+0pts
refined beats base on 5 rows
0%
Base model
0%
Invoked-refined
3 improved0 regressed1 unchanged

Per-row results

1Summarize the holding of a cited appellate case0%100%+100
2Identify the controlling statute in a fact pattern0%100%+100
3Determine whether a precedent was overruled0%100%+100
4Extract the standard of review applied0%0%0
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