OpenAI

To work with OpenAI’s models, you need to provide your OpenAI API key either in the OPENAI_API_KEY environment variable or via the --api-key openai=<key> command line switch.

First, install aider:

python -m pip install aider-install
aider-install

Then configure your API keys:

export OPENAI_API_KEY=<key> # Mac/Linux
setx   OPENAI_API_KEY <key> # Windows, restart shell after setx

Start working with aider and OpenAI on your codebase:

# Change directory into your codebase
cd /to/your/project

# o3-mini
aider --model o3-mini

# o1-mini
aider --model o1-mini

# GPT-4o
aider --model gpt-4o

# List models available from OpenAI
aider --list-models openai/

You can use aider --model <model-name> to use any other OpenAI model. For example, if you want to use a specific version of GPT-4 Turbo you could do aider --model gpt-4-0125-preview.

Reasoning models from other providers

Many of OpenAI’s “reasoning” models have restrictions on streaming and setting the temperature parameter. Some also support different levels of “reasoning effort”. Aider is configured to work properly with these models when served through major provider APIs and has a --reasoning-effort setting.

You may need to configure reasoning model settings if you are using them through another provider and see errors related to temperature or system prompt.