Anthropic: the company behind Claude and its API

Country	United States
Headquarters	San Francisco
Founded	2021
Type	Start-up
Weights policy	Closed models
Model families	Claude
Consumer assistant	Claude
Official site	anthropic.com · Developer API
Models tracked here	12
Best ranking position	#1

Country

United States

Headquarters

San Francisco

Founded

2021

Type

Start-up

Weights policy

Closed models

Model families

Claude

Consumer assistant

Claude

Official site

anthropic.com · Developer API

Models tracked here

Best ranking position

A company built around safety

Anthropic was founded in early 2021 in San Francisco by a team of AI researchers led by siblings Dario Amodei and Daniela Amodei. Its tagline sums up its positioning: AI research and products that put safety at the frontier.

Legally, Anthropic is a public benefit corporation whose stated purpose is the responsible development and maintenance of advanced AI for the long-term benefit of humanity. An unusual body, the Long-Term Benefit Trust, takes part in its governance alongside stockholders. The company is also known for its work on Constitutional AI, alignment and interpretability, the effort to understand what happens inside a model.

One family: Claude

Every Anthropic model carries the Claude name. The family comes in lines of different strength: Haiku for fast, high-volume tasks; Sonnet for the balance of speed and intelligence; Opus for long-running agentic work; and top-of-range lines such as Fable and Mythos. Current models read text and images and can call external tools, which makes them a common building block for an AI agent.

The policy here is simple: no open-weight models. You cannot download Claude or install it on your own server.

How to access Claude

Claude, the assistant: on the web and as apps for iOS, Android, macOS and Windows. Plans and features are on the Claude page.
Claude Code: a dedicated product for software development.
The Claude API and the Amazon Bedrock, Google Cloud and Microsoft Foundry platforms, to build the models into your own applications.

What sets Anthropic apart

In practice, Anthropic stands out less for the breadth of its catalog than for its focus: text, code and agentic work, with no image or video generation. It also regularly publishes research on the safety and transparency of its models, which matters to organizations with strict compliance needs. To see how Claude compares with models from OpenAI or Google, open the model comparison tool.

Anthropic models tracked on this site

Models	Released	Capability index	Price (input / output)
Claude Haiku 5.5	October 7, 2026	84	$0.10 / $0.50
Claude Sonnet 5.5	September 28, 2026	95.9	$2 / $10
Claude Opus 5.5	September 22, 2026	95.9	$4 / $20
Claude Fable 5.1	September 1, 2026	92.6	$10 / $50
Claude Opus 5	July 24, 2026	92.7	$5 / $25
Claude Sonnet 5	June 30, 2026	79.3	$2 / $10
Claude Fable 5	June 9, 2026	90.8	$10 / $50
Claude Opus 4.8	May 28, 2026	83.4	$5 / $25
Claude Opus 4.7	April 16, 2026	83.3	$5 / $25
Claude Sonnet 4.6	February 17, 2026	67.6	$3 / $15
Claude Opus 4.6	February 5, 2026	76.7	$5 / $25
Claude Opus 4.5	November 24, 2025	74.3	$5 / $25

Frequently asked questions

Who runs Anthropic?

The company is led by Dario Amodei, its CEO, and Daniela Amodei, its President. Both sit on the board of directors.

Are the Claude models open source?

No. Anthropic does not publish its model weights. You can only use Claude through its apps, the Claude API or partner cloud platforms.

What do Haiku, Sonnet and Opus mean?

They are lines within the Claude family, from the fastest and most affordable (Haiku) to the most capable (Opus), with Sonnet in between. Anthropic also offers higher-end lines such as Fable for the most demanding reasoning work.

Where can I use Claude besides claude.ai?

Claude models are available through Anthropic's API and on Amazon Bedrock, Google Cloud and Microsoft Foundry. The assistant also comes as mobile and desktop apps, plus extensions for some workplace tools.

Anthropic, the maker of the Claude models

Key figures