API Cost Calculator: Tokens, Cache, and Request Count
A formula and copyable Python calculator for input, output, cache write, cache read, request count, hit rate, and three cost scenarios.
Cost & Limits
Prompt Cache: Cost of the First and Repeated Requests
A reproducible Prompt Cache experiment covering the first request, cache hits, a control miss, break-even math, and usage verification.
Claude Code Subscription vs API in 2026: Which Should You Choose?
Compare Claude Pro, Max, Anthropic API, and BetterToken for Claude Code: pricing, limits, pay-as-you-go billing, setup steps, and cost controls.
Claude Code Rate Limits: Subscription, API 429, or 5xx?
Separate Claude Code subscription limits from API 429 and transient 5xx errors, then diagnose the active endpoint without exposing credentials.
Claude Code for Free: Installation, Subscription, and API
Claude Code is free to install, but working requests need a paid Claude plan, API billing, or a compatible provider. Learn where each billing path begins.
How to Install Codex CLI and Run Your First Task
Four ways to install Codex CLI on Windows 11, macOS, and Linux, verify the install, and keep official sign-in separate from a custom provider.