---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/llm"
description: "Explore articles tagged with LLM by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn LLM best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - LLM Articles | LLM Tutorials"
tokens: 420
generator: "scripts/generate-page-markdown.mjs"
---

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# LLM

3 articles

 [![Cover for the Claude Opus 5 guide: benchmarks, the $5/$25 cost math, effort levels, and the two API breaking changes in the Opus 4.8 migration](https://umesh-malik.com/blog/claude-opus-5-guide-cover.png)

LLM Engineering • Jul 24, 2026

### Claude Opus 5 Migration: The Two API Changes That Break Your Code

Two API changes break a Claude Opus 5 migration, and the effort parameter needs re-sweeping, not reusing. The fixes, the real cost math, and the benchmarks.

12 min read

Read more →](https://umesh-malik.com/blog/claude-opus-5-guide)

 [![Cover for the Claude Fable 5 deep-dive guide: capabilities, the $10/$50 cost math, API behavior, and when to use Anthropic's most capable model](https://umesh-malik.com/blog/claude-fable-5-guide-cover.png)

LLM Engineering • Jul 2, 2026

### Claude Fable 5: Capabilities, Cost & When to Use It (2026)

Claude Fable 5 is Anthropic's most capable model yet. The honest deep-dive: capabilities, the $10/$50 cost math, API behavior, and when to use it.

12 min read

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

 [![Cover for the Claude Sonnet 5 guide: benchmarks, pros and cons, use cases, and cost math versus Sonnet 4.6 and Opus 4.8](https://umesh-malik.com/blog/claude-sonnet-5-guide-cover.png)

LLM Engineering • Jul 1, 2026

### Claude Sonnet 5 for Coding: The Tokenizer Change That Moves Your Bill

Claude Sonnet 5 for coding lands near Opus level at Sonnet prices — until the tokenizer change moves your bill. The real cost math, and when it beats Opus 4.8.

8 min read

Read more →](https://umesh-malik.com/blog/claude-sonnet-5-guide)