By No Code MBA · Facts checked
- Provider
- Moonshot AI
- Announcement date
- Status at last check
- Generally available
- Model family
- Kimi K3.1
- Preceding model
- Kimi K3
- Capabilities
- Text, Image, Video, Coding
What changed
Kimi K3.1 Pro is a post-trained version of Kimi K3 and the first model in the K3.1 series. Moonshot describes it as a 3T-class open-weight model with a 1,048,576-token context window and up to 1M output tokens, and says it improves coding, 3D creation, financial research and agentic tasks. It accepts text, images and uploaded video. A Highspeed variant runs 2 to 3 times faster than K3.1 Pro, according to Moonshot. Thinking is always on, with low, high and max reasoning effort settings.
Access and availability
Use the Kimi platform API with model IDs kimi-k3.1-pro or kimi-k3.1-pro-highspeed through the Chat Completions API. Access requires a top-up of at least $1, and rate limits scale with cumulative top-up. Moonshot says full open weights will be released by November 4.
Official access documentationWhat you can build
Evaluate both variants on the same long-context coding or research task, comparing output quality, response time, and review effort on your own inputs.
Limitations
Open weights were not yet published at launch, and no license or exact parameter count was stated. Sampling parameters are fixed, thinking cannot be disabled, image input must be base64 or uploaded files (no public URLs), and built-in web search is not recommended for production. Moonshot says cyber training data was removed and offensive cyber capability is below frontier proprietary models.