
Claude Opus 5: Benchmarks, Pricing & Two Breaking Changes
Claude Opus 5 delivers near-Fable capability at Opus 4.8's price. Benchmarks, the real cost math, and the two API changes that break a migration.

Claude Opus 5 delivers near-Fable capability at Opus 4.8's price. Benchmarks, the real cost math, and the two API changes that break a migration.

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.

Claude Sonnet 5 gives near-Opus coding at Sonnet pricing, but a tokenizer change alters your real cost. Benchmarks, pros, cons, and when to pick it.

How to write a CLAUDE.md that actually helps Claude Code: what to include, what to leave out, a real structure, and how to stop it from rotting.

The March 31, 2026 Claude Code source-map leak, explained: what was exposed, what wasn't, Anthropic's DMCA sweep, clean-room rebuilds, and the fallout.

Anthropic's Claude Code Review runs multi-agent PR reviews for $15-$25 each. How it works, pricing, REVIEW.md setup, and where it beats linters.