Anthropic

Name: Anthropic
Author: Anthropic PBC

Anthropic is an AI company, set up as a public benefit corporation, that builds the Claude family of large language models. Developers use Claude through the Claude API, Amazon Bedrock or Google Cloud Vertex AI, and people use it through the Claude apps and Claude Code. As of September 2026 the current models are Claude Fable 5.1, Opus 5.5, Sonnet 5 and Haiku 4.5.

By Anthropic PBCPay as you goSince 2021AI Platforms & APIs

Facts checked on 27 September 2026 against the sources listed at the end of this page.

Visit anthropic.com Compare

Pricing: Pay as you goPaid from $20 a month for Claude Pro; API from $1 per million input tokens (Haiku 4.5)
Open source: NoProprietary
GitHub stars: 2,156+32 in the last 30 days
npm downloads a week: 54Mup 13% on the week before
Latest release: google-cloud-s…4 days ago
Releases in 90 days: 10about 3 a month

A good fit for

Adding a capable language model to a product through an API
Coding agents and tools that need long context, such as whole-repository work
Teams that already use AWS or Google Cloud and want Claude inside that account
Long documents: contracts, research papers and codebases up to 1 million tokens

Not a good fit for

Running a model on your own hardware: Anthropic doesn't release open-weight models
Image or video generation: Claude reads images but doesn't create them
Fixed, predictable costs at high volume: API spend grows with tokens used

Anthropic pricing

The Claude apps have a free plan, Pro at $20 a month ($17 a month billed yearly) and Max from $100 a month. The API is billed per million tokens and depends on the model.

Plan	Price	What you get
Free	$0	Chat on web, desktop and mobile, with web search and file creation.
Pro	$20 a month, or $17 a month billed yearly	More usage, Claude Code and more models.
Max	From $100 a month	5x or 20x the usage of Pro and higher output limits.
Team	$25 per seat a month, or $20 billed yearly; premium seats $100	Central billing, admin controls and single sign-on.
API: Haiku 4.5	$1 input / $5 output per million tokens	Fastest and cheapest current model.
API: Sonnet 5	$2 input / $10 output per million tokens	Balanced speed and quality.
API: Opus 5.5	$4 input / $20 output per million tokens	Long-running coding and knowledge work.
API: Fable 5.1	$10 input / $50 output per million tokens	Most demanding reasoning and agent work.

Prices in USD, checked on 27 September 2026. Current prices on claude.com.

Main features

Claude API: Messages API with official SDKs, including @anthropic-ai/sdk for TypeScript and anthropic for Python.
Four model tiers: Fable 5.1, Opus 5.5, Sonnet 5 and Haiku 4.5, priced from $1 to $10 per million input tokens.
Long context: Up to 1 million tokens of context and up to 128,000 output tokens on Fable 5.1, Opus 5.5 and Sonnet 5.
Extended and adaptive thinking: Models can reason step by step before answering, with controls for how much effort they spend.
Claude Code: A coding agent that works in the terminal and IDEs. Included with Pro and Max plans.
Available on major clouds: The same models are offered through Amazon Bedrock and Google Cloud Vertex AI.

About Anthropic

Anthropic builds and runs the Claude models. It sells access in two ways: subscription plans for the Claude apps (web, desktop and mobile), and pay-per-token access to the models through the Claude API for developers who build Claude into their own products.

The current lineup has four models at different price and speed points. Claude Fable 5.1 is aimed at demanding reasoning and long-running agent work, Opus 5.5 at long-running coding and knowledge work, Sonnet 5 at a balance of speed and quality, and Haiku 4.5 at speed and low cost. Fable 5.1, Opus 5.5 and Sonnet 5 accept up to 1 million tokens of context; Haiku 4.5 accepts 200,000.

Anthropic is a public benefit corporation. Its stated purpose is the responsible development of advanced AI, and it publishes research on AI safety and interpretability alongside its products.

Made by: Anthropic PBC
Launched: 2021
Based in: San Francisco, California
Free plan: Yes, in the Claude apps. The API is billed per token.
Available on: Claude API, Amazon Bedrock, Google Cloud Vertex AI, Web, desktop and mobile apps, Claude Code

Usage and activity

Weekly npm downloads of @anthropic-ai/sdk, last 12 months.

Recent releases

google-cloud-sdk-v1.1.14 days ago
aws-sdk-v1.1.14 days ago
sdk-v1.3.04 days ago
google-cloud-sdk-v1.1.04 days ago
aws-sdk-v1.1.04 days ago
sdk-v1.1.06 days ago

Anthropic alternatives

Tool	Pricing	GitHub stars
OpenAIAI research company behind ChatGPT and the GPT model family, accessed through apps and an API.	Freemium	11.2k
OpenAI APIPay-per-token API access to OpenAI's GPT models for building AI into your own applications.	Pay as you go	11.2k
OllamaRun open source AI models locally, with an optional hosted cloud and Pro plan.	Freemium	185k
Hugging FaceHub for open source AI models, datasets and demo apps, plus paid hosting for inference and Spaces.	Freemium	168k
Mistral AIFrench AI company building open-weight and proprietary language models, accessed via API or Le Chat.	Pay as you go	None
GroqAI inference company behind GroqCloud, a fast API for running open models on its own LPU chips.	Pay as you go	None

All 12 alternatives to Anthropic, side by side

Anthropic compared

AnthropicvsOpenAI

OpenAI, founded in 2015, is structured as a nonprofit-controlled entity, the OpenAI Foundation, over OpenAI Group PBC, with Microsoft holding a large minority stake, and ships the ChatGPT apps and GPT-6 models.

Getting started

Create an account in the Claude Console and generate an API key.
Install the TypeScript SDK.
```
npm install @anthropic-ai/sdk
```

Send a first message. The SDK reads the ANTHROPIC_API_KEY environment variable.

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic();
const msg = await client.messages.create({
  model: "claude-sonnet-5",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello, Claude" }],
});
console.log(msg.content);

Questions about Anthropic

What are Anthropic's latest Claude models?

As of September 2026 the current models are Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5 and Claude Haiku 4.5. Several older models, including Claude Sonnet 4.6 and Opus 4.7, are still available through the API.

How much does the Claude API cost?

It's billed per million tokens. Input costs $1 on Haiku 4.5, $2 on Sonnet 5, $4 on Opus 5.5 and $10 on Fable 5.1; output costs five times the input price on each.

Is Claude free to use?

Yes. The Claude apps have a free plan with web search and file creation. Paid plans start at $20 a month for Pro. The API has no free plan and is billed per token.

Is Claude 3.5 Sonnet still available?

No. Anthropic deprecated both Claude 3.5 Sonnet snapshots on 13 August 2025 and retired them on 28 October 2025. It recommends Claude Sonnet 4.6 or a newer model instead.

Can I use Claude on AWS or Google Cloud?

Yes. Claude models are available through Amazon Bedrock and Google Cloud Vertex AI, billed through your cloud account.

Sources and links

Work on Anthropic? Claim this listing. Something wrong or out of date? Suggest a correction. Stats come from the public GitHub and npm APIs and update every day.