aider/aider/website/docs/llms/anthropic.md
2025-04-20 10:28:01 -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.
First, install aider:
{% include install.md %}
Then configure your API keys:
```
export ANTHROPIC_API_KEY=<key> # Mac/Linux
setx ANTHROPIC_API_KEY <key> # Windows, restart shell after setx
```
Start working with aider and Anthropic on your codebase:
```bash
# Change directory into your codebase
cd /to/your/project
# Aider uses Claude 3.7 Sonnet by default
aider
# 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`.
## Thinking tokens
Aider can work with Sonnet 3.7's new thinking tokens, but does not ask Sonnet to use
thinking tokens by default.
Enabling thinking currently requires manual configuration.
You need to add the following to your `.aider.model.settings.yml`
[model settings file](/docs/config/adv-model-settings.html#model-settings).
Adjust the `budget_tokens` value to change the target number of thinking tokens.
```yaml
- name: anthropic/claude-3-7-sonnet-20250219
edit_format: diff
weak_model_name: anthropic/claude-3-5-haiku-20241022
use_repo_map: true
examples_as_sys_msg: true
use_temperature: false
extra_params:
extra_headers:
anthropic-beta: prompt-caching-2024-07-31,pdfs-2024-09-25,output-128k-2025-02-19
max_tokens: 64000
thinking:
type: enabled
budget_tokens: 32000 # Adjust this number
cache_control: true
editor_model_name: anthropic/claude-3-7-sonnet-20250219
editor_edit_format: editor-diff
```
More streamlined support will be coming soon.