Anthropic API

LLM APIs & Platforms

Agentic AI

Claude API now with Opus 4.5 (Nov 24, 2025) - best-in-class for coding and agents. Features advanced tool use (tool search, programmatic calling), extended thinking, prompt caching (90% savings), computer use, and 200K-1M context. Access Opus 4.5, Sonnet 4.5, and Haiku 4.5 via REST API or SDKs with Message Batches API and effort parameter.

Why Use Anthropic API

Opus 4.5 tops SWE-bench Verified with 10.6% better performance than Sonnet. Advanced tool use: 85% token reduction with tool search, 37% savings with programmatic calling, 90% accuracy with examples. Effort parameter balances speed vs capability. Prompt caching saves 90%. Most robustly aligned API for production agents.

Use Cases for Builders

Practical ways to use Anthropic API in your workflow

Build coding agents with Opus 4.5 - state-of-the-art SWE-bench performance
Save 85% on tokens using tool search for large tool libraries (10K+ tokens)
Orchestrate multi-step workflows with programmatic tool calling (37% token reduction)
Process spreadsheet operations at scale like Claude for Excel
Implement deep reasoning with extended thinking mode

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Advanced AI assistant now featuring Claude Opus 4.5 (Nov 24, 2025) - best-in-class for coding and autonomous tasks. Includes endless chat with automatic context compression, Claude for Chrome extension, Claude for Excel integration, extended thinking mode, Artifacts, and computer use. 200K-1M context window with built-in web search.

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Agentic coding assistant powered by Claude Opus 4.5 (Nov 24, 2025). Runs in browser, desktop (VS Code/JetBrains), and iOS. Enhanced Plan Mode asks clarifying questions upfront. Handles complete software engineering workflows with GitHub integration, parallel task execution, and automatic PR creation. 90% of Claude Code itself is written by AI.

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