
Claude API key security: how to keep your Anthropic key safe
A Claude API key works like a credit card for your Anthropic account. Where to store it, why it never belongs in frontend code, and what to do if it leaks.
Notes tagged Claude.

A Claude API key works like a credit card for your Anthropic account. Where to store it, why it never belongs in frontend code, and what to do if it leaks.

Claude API pricing as of Oct 19, 2026: per-token rates for Opus, Sonnet and Haiku, worked cost examples, and how batch and caching lower your bill.

Claude vs ChatGPT for coding, compared on verified facts: API prices, context windows and coding agents (Claude Code vs Codex), plus how to test both.