Tag

#model-selection

Posts tagged with model-selection

2 posts

The pass@k crossover at the heart of choosing between a base checkpoint and its RL-tuned sibling.

Engineering • Sep 22, 2026 •11 min read

Pass@k Crossover Tests Tell You When to Ship the Base Model

Pass@k crossovers show RLVR sharpens rather than adds capability. Learn the decision rule and statistical test that find your model's crossover point.

#passk #rlvr +4

Claude Opus 5 achieves a 0% prompt injection success rate across 129 browser-agent scenarios, offering a model-attributed security metric for foundation model selection.

Tools • Jul 25, 2026 •10 min read

Claude Opus 5 Prompt Injection Hits 0% Across 129 Tests

Claude Opus 5 prompt injection tests show 0% success with Auto Mode versus 3.7% without across 129 scenarios, making resistance a model selection metric.

#prompt-injection #model-selection +4