---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/benchmarks"
description: "Explore articles tagged with Benchmarks by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn Benchmarks best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - Benchmarks Articles | Benchmarks Tutorials"
tokens: 552
generator: "scripts/generate-page-markdown.mjs"
---

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# Benchmarks

4 articles

 [![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)

 [![Agent harness design diagram: a model's reasoning discarded each turn versus reasoning retained and context compacted across turns](https://umesh-malik.com/blog/agent-harness-design-arc-agi-3-cover.png)

AI Engineering • Aug 5, 2026

### Agent Harness Design: Why an ARC-AGI-3 Score Tripled

Agent harness design decided a benchmark: OpenAI's ARC-AGI-3 score went 13.3% → 38.3% with zero model changes. What that means for your agent loop.

11 min read

Read more →](https://umesh-malik.com/blog/agent-harness-design-arc-agi-3)

 [![DeepSeek V4 Flash 0731 agent benchmark results compared against the preview build and V4-Pro Preview](https://umesh-malik.com/blog/deepseek-v4-flash-0731-benchmarks-cover.png)

LLM Engineering • Aug 1, 2026

### DeepSeek V4 Flash 0731 Benchmarks: 13B Active Beats 1.6T

DeepSeek V4 Flash 0731 benchmarks: same 284B/13B architecture as the preview, re-post-trained only — and it beats the 1.6T V4-Pro Preview on nine agent tests.

9 min read

Read more →](https://umesh-malik.com/blog/deepseek-v4-flash-0731-benchmarks)

 [![Kimi K3 vs Claude Fable 5 head-to-head showing benchmarks, pricing, and where the open 2.8T model wins](https://umesh-malik.com/blog/kimi-k3-vs-fable-5-cover.png)

LLM Engineering • Jul 19, 2026

### Kimi K3 vs Claude Fable 5: When the Open Model Is Worth the Switch

Kimi K3 beats Claude Fable 5 on cost by a wide margin and loses on agentic tasks. The benchmarks that decide it, and how to run K3 where it actually wins.

6 min read

Read more →](https://umesh-malik.com/blog/kimi-k3-vs-claude-fable-5)