Prove the lift · AI model performance evaluation

nemotron-ultra-253b vs gpt-5.1

+11-point lift for nemotron-ultra-253b on code-review-bench

Test summary

This benchmark evaluates nemotron-ultra-253b against gpt-5.1 on the code-review-bench v2 dataset (5 rows), scored by an LLM-as-judge (claude-haiku-4-5). nemotron-ultra-253b reached a 63% pass rate versus 52% for gpt-5.1 — a +11-point lift.

Base model
gpt-5.1
via openai · 52% pass rate
Refined model
nemotron-ultra-253b
via nvidia · 63% pass rate · 0.7s p95
Base pass rate
52%
Refined pass rate
63%
Refined p95
0.7s
Est. tokens saved
8.7K
+0pts
refined beats base on 5 rows
0%
Base model
0%
Invoked-refined
2 improved0 regressed3 unchanged

Per-row results

1Flag an off-by-one in a pagination loop100%100%0
2Detect a missing await on an async DB write0%100%+100
3Identify an N+1 query in an ORM call site100%100%0
4Spot a race in a read-modify-write on shared state0%100%+100
5Catch an unsanitized input reaching a SQL string100%100%0
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