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The Artificial Index

Kimi K3.1 Pro

Model
Moonshot AIFamily Kimi K3.1active

Release date, context window and specs of Moonshot AI's AI model

Moonshot AI's flagship 3T-class model with a one-million-token context window, vision input, and strengthened coding, 3D, finance, and agentic capabilities.

Released
Oct 24, 2026
Context window
1M†
Modality
textimage
Open source
Yes
API available
—
Releases
2

Releases

2
Nov 4, 2026Kimi K3.1 Pro open weights scheduled for releaseScheduledKimi K3.1 Pro · K3.1 Pro

Moonshot AI says full weights of Kimi K3.1 Pro, a 3T-class model with a 1M-token context window, will be released under an open license by November 4, 2026. Cyber-related data was removed from training before release.

Moonshot AI Open weightsMoonshot AIKimi K3.1 Pro
Oct 24, 2026Moonshot AI launches Kimi K3.1 ProKimi K3.1 Pro · K3.1 Pro

Moonshot AI launched Kimi K3.1 Pro, its flagship 3T-class model with a one-million-token context window and improved coding, 3D, finance, and agentic capabilities, plus a Highspeed variant that runs two to three times faster. Full weights are due by November 4.

Moonshot AI Model releaseMoonshot AIKimi K3.1 Pro

Kimi K3.1 Pro FAQ

When was Kimi K3.1 Pro released?

Kimi K3.1 Pro was released by Moonshot AI on Oct 24, 2026.

What is the context window of Kimi K3.1 Pro?

Kimi K3.1 Pro has a context window of 1,000,000 tokens (1M).

Is Kimi K3.1 Pro open source?

Yes. Kimi K3.1 Pro is listed as open source (open weights).

Which model family does Kimi K3.1 Pro belong to?

Kimi K3.1 Pro is part of the Kimi K3.1 model family by Moonshot AI.