Prove the lift · AI model performance evaluation

gpt-5.1 vs claude-opus-5

+8-point lift for gpt-5.1 on code-review-bench

Test summary

This benchmark evaluates gpt-5.1 against claude-opus-5 on the code-review-bench v2 dataset (5 rows), scored by an LLM-as-judge (llama-3.1-8b). gpt-5.1 reached a 41% pass rate versus 33% for claude-opus-5 — a +8-point lift.

Base model
claude-opus-5
via anthropic · 33% pass rate
Refined model
gpt-5.1
via openai · 41% pass rate · 3.0s p95
Base pass rate
33%
Refined pass rate
41%
Refined p95
3.0s
Est. tokens saved
10.2K
+0pts
refined beats base on 5 rows
0%
Base model
0%
Invoked-refined
2 improved1 regressed2 unchanged

Per-row results

1Find a resource leak on an early-return path0%100%+100
2Catch an unsanitized input reaching a SQL string100%100%0
3Spot a race in a read-modify-write on shared state100%0%-100
4Identify an N+1 query in an ORM call site0%0%0
5Detect a missing await on an async DB write0%100%+100
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