Developer Guides
Connect Codex or Claude Code, understand the bill, debug a failed request, and measure a gateway with reproducible evidence.
Start with documentationSetup, compatibility and measurement
Written by the Superfastcode team. Reviewed October 16, 2026.
Codex Custom Provider: API Key and config.toml Setup
Configure Codex CLI with a Superfastcode custom provider, preserve your existing login, run a smoke test and troubleshoot common configuration errors.
Read the guide docsClaude Code Gateway Setup on macOS, Linux and Windows
Set ANTHROPIC_BASE_URL and a Superfastcode token for Claude Code, verify the connection, persist settings and restore your previous configuration.
Read the guide integrationCodex Gateway Integration and Compatibility
Understand Superfastcode support for Codex App and Codex CLI, Responses routing, API keys, model availability and client limitations.
Read the guide integrationClaude Code Gateway Integration and Compatibility
Use Superfastcode with Claude Code. Learn how gateway credentials, model selection, usage billing and Claude Code-only channels work.
Read the guide guideClaude Code Pricing: Subscription vs API Token Costs
Understand Claude subscriptions versus gateway API billing, calculate input, output and cached token costs, and distinguish API Credits from cash paid.
Read the guide guideFix Codex and Claude Code API Errors: 401, 429 and More
Diagnose authentication, model, quota, timeout and streaming failures in Codex and Claude Code with a practical, privacy-aware support checklist.
Read the guide guideHow to Benchmark an AI Coding Gateway Reproducibly
Read ten dated Codex and Claude Code marker observations with latency, billing limits and sanitized evidence. Download a CLI harness to run your own tests.
Read the guide