---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/ai-research"
description: "Explore articles tagged with AI Research by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn AI Research best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - AI Research Articles | AI Research Tutorials"
tokens: 160
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---

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# AI Research

1 article

 [![Timeline comparing the knowledge-cutoff date vendors claim for Claude Opus 5 against the earlier cutoff its answers actually reveal](https://umesh-malik.com/blog/testing-llm-knowledge-cutoffs-opus-5-cover.png)

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

Read more →](https://umesh-malik.com/blog/testing-llm-knowledge-cutoffs-opus-5)