MiniMax M3.1 Flash, the model behind Space Bunny, is free on OpenRouter with 1M context and multimodal input
OpenRouter added a free MiniMax M3.1 Flash endpoint as minimax/minimax-m3.1-flash:free. Input and output cost $0, with rate limits on the free endpoint. It accepts text, image, and video, has a 1M-token context window, up to 524K output tokens, and reasoning stays on by default.
The briefing
OpenRouter launched a free MiniMax M3.1 Flash endpoint with model id minimax/minimax-m3.1-flash:free. Input and output are billed at $0, and free endpoints are rate limited.
What you can use
MiniMax M3.1 Flash is a multimodal model from MiniMax for complex agent workflows, coding, and security-related tasks. It accepts text, images, and video, and returns text. The context window is 1M tokens, with up to 524K output tokens. Reasoning is on by default, and you can adjust reasoning effort per task.
It supports tools for function calling and response_format for structured outputs. Good fits include long-context co-work, reading real codebases, fixing bugs, and tasks that need image or video understanding.
The same model is also free on Vercel AI Gateway; see MiniMax M3.1 Flash free on Vercel AI Gateway. If you prefer MiniMax's own subscription and Code client, there is also M Plan half off with unlimited M3.1 Flash.
How to use it
- Sign in to OpenRouter and create an API key.
- In any OpenAI-compatible client or SDK, set the base URL to
https://openrouter.ai/api/v1. - Set the model to
minimax/minimax-m3.1-flash:freeand send images or video with the multimodal message format.
Coding tools such as Cline and Kilo Code can also connect to OpenRouter and use this model. See the OpenRouter model page.