What Is Anthropic AI Called? Claude, Explained

Anthropic's AI is called Claude. Anthropic is the name of the company; Claude is the name of the AI assistant and the family of language models it builds and ships. If you've used ChatGPT and are wondering what the "Anthropic version" is called, the answer is Claude — accessible through claude.ai, the Claude mobile apps, and the Anthropic API.

The confusion is understandable because Anthropic doesn't put its own name on the product the way some competitors do. OpenAI's assistant is ChatGPT, Google's is Gemini, and Anthropic's is Claude — named after Claude Shannon, the mathematician often called the father of information theory. Anthropic is the research lab and company; Claude is the product.

Claude: the name and the model family

"Claude" refers to a family of models, not a single AI. Anthropic releases different versions and sizes, each with its own name, so you'll see references like:

• Claude Opus — the most capable, highest-cost tier
• Claude Sonnet — balanced performance and speed, the default for most production use
• Claude Haiku — fastest and cheapest, built for high-volume or latency-sensitive tasks

Each of these gets numbered generations (for example Claude 3, Claude 3.5, Claude 3.7, Claude 4), so a full model name looks like "Claude Opus 4" or "Claude 3.5 Sonnet." When people say "I'm using Claude," they usually mean whichever specific model their app or API call is configured to use.

This naming pattern — poet/composer-style tier names attached to a version number — is unique to Anthropic. It's worth knowing because API requests require an exact model identifier string (e.g., claude-sonnet-4-20250514), not just "Claude."

Where the Claude name shows up

You'll encounter the Claude name in a few different contexts:

• claude.ai — the consumer chat web app and mobile apps
• Claude Code — Anthropic's CLI/agentic coding tool (what generated this article)
• Claude for Enterprise / Team — business plans with admin controls
• The Anthropic API — programmatic access to Claude models for developers building products

That last one is where things get more technical. If you're a developer, you're not asking "what is Anthropic AI called" out of curiosity — you're trying to figure out how to integrate it. That's a separate question from naming, but it comes up right after.

Using Claude programmatically

Once you know the AI is called Claude, the next question is usually: how do I call it from code? Anthropic exposes Claude through its own API, and there are also third-party gateways that wrap it.

A raw Claude API call (via Anthropic directly) looks like this conceptually:

curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Explain what Claude is in one sentence."}]
  }'

If you already have a Claude subscription (Pro, Team, or similar) and want to turn that access into a proper API without separately provisioning Anthropic API billing, that's the specific problem SubToAPI solves. It issues application API keys (sub_live_...) backed by your existing Claude access, so you get streaming responses, tool use, and usage metadata in one dashboard — useful if you're building an internal tool or SaaS feature on top of Claude and don't want to manage two separate billing relationships.

curl https://api.subtoapi.app/v1/messages \
  -H "Authorization: Bearer $SUBTOAPI_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Explain what Claude is in one sentence."}]
  }'

The request shape mirrors the standard Messages API, so if you've read Anthropic's docs, the SubToAPI docs and quickstart will feel familiar. There's a free trial at signup, and plans start at €9/month on the pricing page.

Claude vs. Anthropic: quick summary

| Term | What it refers to | |---|---| | Anthropic | The AI safety company that builds and researches the models | | Claude | The AI assistant/product name, and the model family | | Claude Opus/Sonnet/Haiku | Specific model tiers within the Claude family | | Anthropic API | The developer interface for calling Claude programmatically |

If someone asks "what AI does Anthropic make," the short answer is Claude. If they ask "what is Anthropic," the short answer is: the company behind Claude.

Questions

Is Claude the same thing as Anthropic? No. Anthropic is the company; Claude is the AI product and model family it builds. You use Claude, but you'd say you're a customer of Anthropic.

Why is it called Claude? Anthropic named it after Claude Shannon, considered the founder of information theory, whose work underpins modern computing and communication — a nod that fits an AI company's naming philosophy.

How do I access Claude as a developer? Through the Anthropic API directly, or through a service like SubToAPI that turns your existing Claude subscription into an HTTPS API key — see the docs for the request format and streaming guide for real-time output.