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---
name: claude
description: Anthropic Claude AI models for analysis and coding. Use for AI assistants.
---
# Claude
Claude (by Anthropic) is OpenAI's main competitor. It is famous for its **large context window** (200k+), low hallucination rates, and "Artifacts" UI.
## When to Use
- **Coding**: Claude 3.5 Sonnet is widely considered the best coding model in 2025.
- **Long Context**: Analyzing massive PDFs or codebases.
- **Safety**: Enterprise-grade safety guardrails.
## Core Concepts
### Models
- **Opus**: The smartest, largest model.
- **Sonnet**: The sweet spot. Fast and incredibly capable.
- **Haiku**: Fast and cheap.
### Artifacts
A UI feature (now an API pattern) where the model generates standalone content (React components, SVGs) in a side window.
### Computer Use
Claude can interact with a computer GUI (moving mouse, clicking) via API.
## Best Practices (2025)
**Do**:
- **Use Sonnet for Dev**: It beats GPT-4o in many coding benchmarks.
- **Use XML Tags**: Claude loves `<instructions>` and `<context>` tags in prompts.
- **Prefill Responses**: Guide Claude by prefilling the `{"role": "assistant", "content": "{"}` to force JSON.
**Don't**:
- **Don't ignore System Prompts**: Claude relies heavily on strong system instructions.
## References
- [Anthropic Documentation](https://docs.anthropic.com/)
