Anthropic Claude
Claude is Anthropic's family of large language models. It is known for long-form reasoning, a careful tone, and the Constitutional AI training approach.
Anthropic Claude is a family of large language models developed by Anthropic, the AI safety company founded in 2021 by former OpenAI researchers. Claude is recognised for long-context reasoning, careful tone, strong code generation, and a training methodology Anthropic calls Constitutional AI.
The Claude model family
| Model tier | Best for |
|---|---|
| Claude Opus | Frontier reasoning, research-grade analysis, complex coding |
| Claude Sonnet | Balanced reasoning, day-to-day product workloads, default for most apps |
| Claude Haiku | Fast, low-cost classification and high-volume tasks |
Claude is available through the claude.ai consumer assistant, the Anthropic API, and managed offerings on Amazon Bedrock and Google Cloud Vertex AI.
What makes Claude distinctive
- Constitutional AI. A training approach where the model is asked to critique and revise its own outputs against a written set of principles, reducing the need for purely human-labelled examples.
- Long context windows. Claude has historically led on usable context window length, supporting hundreds of thousands of tokens of input.
- Tool use and computer use. Claude can call functions, browse, and — in newer releases — drive a computer interface directly, making it a strong substrate for agentic workflows.
- Tone. Output tends to be more measured and explanatory than competing models, which makes it popular for analyst, legal and writing workflows.
Claude vs. GPT vs. Gemini
| Dimension | Claude | GPT (OpenAI) | Gemini (Google) |
|---|---|---|---|
| Owner | Anthropic | OpenAI | Google DeepMind |
| Strengths | Long context, careful reasoning, coding | Ecosystem breadth, image gen, tool use | Multimodal, Google integration, AIO |
| Search product | Web search inside Claude | ChatGPT Search | Google AI Overviews |
| Crawlers | ClaudeBot, Claude-Web, anthropic-ai | GPTBot, OAI-SearchBot | Google-Extended, Googlebot |
Why Claude matters for AEO
Claude is the model of choice for many B2B and enterprise workflows — legal review, market research, technical writing, software engineering. The audience using Claude to research vendors and compare options skews high-intent. Being well-represented in Claude's web search results is disproportionately valuable for considered B2B purchases.
How to be visible in Claude
- Allow ClaudeBot, Claude-Web and anthropic-ai in robots.txt unless you have a specific reason to block them.
- Publish dense, well-structured reference content. Claude's web search rewards clean, scannable pages.
- Earn external mentions. Independent coverage in trusted sources strengthens the signals Claude's ranking layer relies on.
- Track citations. Run a representative prompt set against Claude on a recurring basis and capture which domains appear.
Frequently asked questions
Does Claude train on my content?
Anthropic publishes its training data policy and respects robots.txt directives for its training crawlers. Review the current policy before assuming behaviour.
Is Claude available in my country?
Claude is available in most major markets, with availability expanding regularly. The Anthropic API is broadly accessible; the consumer assistant has a more limited rollout.
Which Claude crawler is which?
ClaudeBot is the primary training crawler. Claude-Web handles user-initiated fetches when someone asks Claude to read a URL. anthropic-ai is a legacy identifier used by some Anthropic services.
Related Terms
ChatGPT Search
ChatGPT Search is OpenAI's web-connected mode inside ChatGPT. It returns conversational answers grounded in live web results, with inline citations.
What Are AI Crawlers?
AI crawlers are bots run by AI vendors. Some fetch pages to train models, others fetch pages live to power answers inside AI search products.
Google Gemini
Google Gemini is the multimodal model family from Google DeepMind. It powers AI Overviews, the Gemini assistant, and most generative features across Google's products.
Microsoft Copilot
Microsoft Copilot is the umbrella for Microsoft's AI assistants: the consumer chat experience on GPT and Bing, and the 365 Copilot embedded across Office.
Model Context Protocol (MCP)
Model Context Protocol is an open standard from Anthropic that gives AI models a consistent way to call tools, fetch data, and act on external systems.
Large Language Model (LLM)
A large language model is an AI trained on huge amounts of text to predict the next token, which is enough to make it read, write, and reason in plain language.
