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Claude API Reference

Current Claude API and SDK facts: models, pricing, tools, caching and agents.

Official Anthropicby AnthropicChecked October 18, 2026

Anthropic's reference skill for building applications on the Claude API. It keeps Claude from answering about models, prices or parameters from stale memory and helps pick the right approach for an agent.

Who it is for

  • Developers building with Claude
  • Technical founders
  • AI engineers

Prompts to try

Once the skill is installed, ask for the result in plain words. Claude picks the skill up on its own.

Prompt 1
Add prompt caching to my Claude API calls
Prompt 2
Which Claude model should I use for a high-volume classifier, and what will it cost?
Prompt 3
Build a tool-using agent with the Anthropic Python SDK

How to install it

In Claude Code

  1. /plugin marketplace add anthropics/skills
  2. /plugin install claude-api@anthropic-agent-skills

In Claude.ai

Zip the skill folder and upload it under Customize > Skills > + > Create skill > Upload a skill.

Good to know

Updated frequently as the API changes.

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How we checked it

Confirmed SKILL.md at skills/claude-api/SKILL.md in anthropics/skills via the GitHub API; skill folder last changed 2026-10-09, repo has 181,779 stars and was pushed 2026-10-09; the most recently updated skill in anthropics/skills.

Source: github.com/anthropics/skills/tree/main/skills/claude-api

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