Claude

AI Assistants

Agentic AI

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.

Why Use Claude

Opus 4.5 tops SWE-bench Verified and excels at coding, agents, and complex workflows. Endless chat never interrupts - context compresses automatically. Claude for Chrome brings AI to your browser. Claude for Excel enables spreadsheet automation. Computer Use controls desktop environments. Most robustly aligned frontier model.

Use Cases for Builders

Practical ways to use Claude in your workflow

Write and debug code with Opus 4.5 - tops SWE-bench Verified benchmarks
Have unlimited conversations with endless chat (auto context compression)
Automate spreadsheet tasks with Claude for Excel integration
Browse the web with AI assistance using Claude for Chrome extension
Generate interactive prototypes using Artifacts for quick mockups

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LLM APIs & Platforms

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.

Code Development

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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The world's most popular AI assistant powered by GPT-5.1 (Nov 12, 2025), featuring Instant and Thinking variants. GPT-5.1 Instant offers adaptive reasoning with warmer, more conversational responses. Includes 272K context, web search with 45% fewer factual errors, advanced voice mode, Canvas for iterative work, and custom GPTs.

Try Claude

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