Model Comparison

2 articles

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

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