Gemini 4 Argon Flex
Use it free in free-pi
slower, half price · ~0.05x usage
npx free-pi-cli
/model gemini-4-argon-flexAbout Gemini 4 Argon Flex
Gemini 4 Argon Flex is the same model as Gemini 4 Argon, Google's flagship reasoning model, run on a slower, cheaper service tier. The model itself is unchanged: the same one-million-token context window, the same support for text, image, file, audio, and video input, and the same reasoning, tool calling, and structured output support. The agent can still read and edit files, run commands, and use free-pi's web search and documentation tools.
The difference is speed and allowance. Responses on the flex tier are slower, and in exchange the model uses less of your daily allowance. In free-pi it counts as about 0.05x usage, compared with about 0.02x for the regular version, so your allowance lasts a bit more than twice as long. It is still free with no API key and no card.
When to pick it
For Gemini 4 Argon's quality on a task that is not urgent, such as a long refactor or a background investigation, pick Gemini 4 Argon Flex. It suits work where you would rather make your allowance last than get fast replies.
For faster responses, pick the regular Gemini 4 Argon. For everyday work that uses far less allowance, pick the default DeepSeek V4 Flash.