Technology

Anthropic Messages API

The primary interface for building Claude-powered applications via structured, multi-turn message arrays.

Anthropic's Messages API serves as the gateway to Claude 3.5 Sonnet and the Opus model family. It replaces the legacy Text Completions endpoint with a robust, role-based structure (user vs. assistant) that supports multi-modal inputs like images and PDFs. Developers use this API to manage context windows up to 200k tokens, implement tool use (function calling), and stream real-time responses with sub-second time-to-first-token performance.

https://docs.anthropic.com/en/api/messages

What builders pair with Anthropic Messages API

Projects using both technologies. Select a pairing to see a project.

Built with Anthropic Messages API

ADP Workforce Now 1 shared project Claude Code 1 shared project claude-sonnet-4-20250514 1 shared project JavaScript 1 shared project JSON 1 shared project OpenAI Codex 1 shared project

2 more pairings

pi 1 shared project TypeScript 1 shared project

Pairing: ADP Workforce Now

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Domain-encoded system prompts: turning 15 years of accounting forensics into a live Claude diagnostic tool

Montreal · March 24, 2026

view project | view ADP Workforce Now

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pi-hydra: Mob Programming Agents

pi Anthropic Messages API

Domain-encoded system prompts: turning 15 years of accounting forensi…

Montreal Mar 24

Anthropic Messages API claude-sonnet-4-20250514