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.

Aider has some built in shortcuts for the most popular OpenAI models and has been tested and benchmarked to work well with them:

python -m pip install -U aider-chat

# o3-mini
aider --model o3-mini --api-key openai=<key>

# o1-mini
aider --model o1-mini --api-key openai=<key>

# GPT-4o
aider --4o --api-key openai=<key>

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

# You can also store you API key in environment variables (or .env)
export OPENAI_API_KEY=<key> # Mac/Linux
setx   OPENAI_API_KEY <key> # Windows, restart shell after setx

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.

o1 models from other providers

Many of OpenAI’s o1 “reasoning” models have restrictions on streaming and setting the temperature parameter. Aider is configured to work properly with these models when served through major provider APIs.

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.