Prove the lift · AI model performance evaluation

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

+19-point lift for claude-opus-4-8 on legal-research-qa

Test summary

This benchmark evaluates claude-opus-4-8 against claude-opus-4-6 on the legal-research-qa v3 dataset (5 rows), scored by an LLM-as-judge (llama-3.1-8b). claude-opus-4-8 reached a 75% pass rate versus 56% for claude-opus-4-6 — a +19-point lift.

Base model
claude-opus-4-6
via anthropic · 56% pass rate
Refined model
claude-opus-4-8
via anthropic · 75% pass rate · 3.2s p95
Base pass rate
56%
Refined pass rate
75%
Refined p95
3.2s
Est. tokens saved
8.1K
+0pts
refined beats base on 5 rows
0%
Base model
0%
Invoked-refined
2 improved1 regressed1 unchanged

Per-row results

1Extract the standard of review applied0%100%+100
2Identify the controlling statute in a fact pattern100%100%0
3Determine whether a precedent was overruled0%100%+100
4Summarize the holding of a cited appellate case100%0%-100
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