Prove the lift · AI model performance evaluation

gpt-5.1 vs claude-opus-5

+13-point lift for gpt-5.1 on contract-clause-qa

Test summary

This benchmark evaluates gpt-5.1 against claude-opus-5 on the contract-clause-qa v2 dataset (5 rows), scored by an LLM-as-judge (gpt-4o-mini). gpt-5.1 reached a 71% pass rate versus 58% for claude-opus-5 — a +13-point lift.

Base model
claude-opus-5
via anthropic · 58% pass rate
Refined model
gpt-5.1
via openai · 71% pass rate · 3.4s p95
Base pass rate
58%
Refined pass rate
71%
Refined p95
3.4s
Est. tokens saved
1.8K
+0pts
refined beats base on 5 rows
0%
Base model
0%
Invoked-refined
3 improved0 regressed2 unchanged

Per-row results

1Locate the termination-for-convenience terms100%100%0
2Identify the governing-law clause and jurisdiction0%100%+100
3Find the liability cap and its exceptions0%100%+100
4Extract the auto-renewal notice window in days0%100%+100
5Determine indemnification scope and carve-outs100%100%0
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