Claude API

This category is for people building on the Claude API, and it's written by people who do: our own client code calls the API daily, so the guidance on requests, tokens, streaming, retries, and cost comes from running real workloads rather than paraphrasing the reference. Where a parameter has changed or a pattern has quietly been deprecated, that's exactly the kind of thing we try to flag before it costs you a debugging session.

Start with getting-started and pricing to size a project, then dig into the mechanics — tool use, structured output, batching, caching, and the specific error codes you'll meet in production. The through-line is practical: enough working detail to ship, plus the honest limits and gotchas that the happy-path docs tend to skip.