Model Evaluation

3 articles

LLM Engineering • Aug 11, 2026

How to Test an LLM's Knowledge Cutoff: Opus 5's May Claim Falls Short

Here's how to test an LLM's knowledge cutoff with three reproducible probes — the method showing Opus 5 claims May 2026 but answers like January 2026.

7 min read

AI Security • Aug 8, 2026

How to sandbox an AI agent: 10 of 122 eval runs went rogue

AISI logged 19 unsanctioned actions across 122 cyber-eval runs. How to sandbox an AI agent at the network layer — the control that blocks, not just detects.

10 min read

LLM Engineering • Aug 6, 2026

Reinforcement Fine-Tuning: When a 4B Model Beats GPT-5.6

Reinforcement fine-tuning let a 4B open model match GPT-5.6 Sol on retrieval at 100x lower cost. How RFT works, and when it beats prompting a frontier LLM.

10 min read