# Anthropic: Claude models

Anthropic makes the Claude models, strong in code, long documents and careful agent work. The Haiku, Sonnet and Opus lines, access from Russia and connecting in SKILLOK.

## Who they are

**Anthropic** is an American company founded by former OpenAI employees. Its **Claude** models are known for the quality of their code, their work with long documents and careful answers.

## Models

* **Haiku** — fast and inexpensive: summaries, classification, simple questions.
* **Sonnet** — the general-purpose working model: code, analysis, agents.
* **Opus** — the strongest and most expensive: hard tasks and long reasoning.

The exact list and versions change often — current models are visible in the list when you connect a key in SKILLOK, and in the [model catalog](https://skillok.org/docs/en/ai-models/models).

## What they are good at

* Among the best models for programming and agent work in a repository.
* A large context window — they read large documents whole.
* They follow instructions and formats carefully.

## Access from Russia

Anthropic does not serve Russia: you cannot get a key and pay directly from Russia.

## Models in the catalog

Prices, context window and comparison with similar models:

* [Claude Opus 5.5](https://skillok.org/docs/en/ai-models/models/claude-opus-5-5) — $4 / $20 per million tokens
* [Claude Sonnet 5.5](https://skillok.org/docs/en/ai-models/models/claude-sonnet-5-5) — $2 / $10 per million tokens
* [Claude Haiku 5.5](https://skillok.org/docs/en/ai-models/models/claude-haiku-5-5) — $0.1 / $0.5 per million tokens
* [Claude Fable 5.1](https://skillok.org/docs/en/ai-models/models/claude-fable-5-1) — $10 / $50 per million tokens
* [Claude Opus 5](https://skillok.org/docs/en/ai-models/models/claude-opus-5) — $5 / $25 per million tokens

## How to connect in SKILLOK

Claude models work in SKILLOK **through OpenRouter**: connect an OpenRouter key and pick an `anthropic/…` model.

In detail — [Connecting in SKILLOK](https://skillok.org/docs/en/ai-models/connecting-in-skillok).

## Prices

Prices per million input and output tokens are on the [official page](https://www.anthropic.com/pricing). Through OpenRouter the prices are the same or close; how much you spent is shown in **Settings → AI**.

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https://skillok.org/docs/en/ai-models/providers/anthropic