aider/aider/website/docs/llms/anthropic.md
2024-09-26 11:40:48 -07:00

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---
parent: Connecting to LLMs
nav_order: 200
---
# Anthropic
To work with Anthropic's models, you need to provide your
[Anthropic API key](https://docs.anthropic.com/claude/reference/getting-started-with-the-api)
either in the `ANTHROPIC_API_KEY` environment variable or
via the `--anthropic-api-key` command line switch.
Aider has some built in shortcuts for the most popular Anthropic models and
has been tested and benchmarked to work well with them:
```
python -m pip install -U aider-chat
export ANTHROPIC_API_KEY=<key> # Mac/Linux
setx ANTHROPIC_API_KEY <key> # Windows, restart shell after setx
# Aider uses Claude 3.5 Sonnet by default (or use --sonnet)
aider
# Claude 3 Opus
aider --opus
# List models available from Anthropic
aider --list-models anthropic/
```
{: .tip }
Anthropic has very low rate limits.
You can access all the Anthropic models via
[OpenRouter](openrouter.md)
or [Google Vertex AI](vertex.md)
with more generous rate limits.
You can use `aider --model <model-name>` to use any other Anthropic model.
For example, if you want to use a specific version of Opus
you could do `aider --model claude-3-opus-20240229`.