# Moonshot AI Launches Kimi K3.1 Pro Open Weight Model

> Moonshot AI's Kimi K3.1 Pro model beats Claude Opus 5.5 on coding benchmarks with free open weights by November 4.
- Title: Moonshot AI Launches Kimi K3.1 Pro Open Weight Model
- Summary: Moonshot AI's Kimi K3.1 Pro model beats Claude Opus 5.5 on coding benchmarks with free open weights by November 4. Moonshot AI released Kimi K3.1 Pro, an…
- Keywords: moonshot ai, kimi k3.1 pro, open weight model, claude opus, terminal bench, coding benchmark, ai pricing, startups, business, Moonshot, Launches, Kimi
- Source: Startup Fortune — https://startupfortune.com/moonshot-ai-releases-kimi-k31-pro-open-weight-model-to-rival-claude
- Published: 2026-10-23T18:23:36+00:00
- Read time: 1 min
- Topics: moonshot ai, kimi k3.1 pro, open weight model, claude opus, terminal bench, coding benchmark, ai pricing, startups, business
## Kimi K3.1 Pro Launch
Moonshot AI launched Kimi K3.1 Pro on October 24, its first major upgrade since the K3 release.
## Coding Benchmark Results
K3.1 Pro scored 65.7% on Terminal-Bench 4.0, beating GPT-6 Astra's 58.2% and being 0.7 points behind Claude Opus 5.5.
## Model Size and Features
K3.1 Pro carries 2.8 trillion parameters with 104 billion active through a mixture-of-experts architecture and handles 1 million token context.
## Hallucination Rate Improvement
Kimi Hallu Bench Hard shows hallucination rate dropped from 23.4% to 8.3% between K3 and K3.1 Pro.
## Integration with Tools
K3.1 Pro works directly in Blender, Unreal Engine, Godot, and CAD software for 3D modeling and game projects.
## Pricing and Cost
Kimi K3.1 Pro costs $3/$15 per million input/output tokens, three to four times its predecessor's price.
## Open Weights Release Date
Moonshot will publish full open weights by November 4, giving a two-week lead for monetization.
## Key takeaway

Moonshot AI released Kimi K3.1 Pro, an open-weight AI model that scores close to Claude Opus 5.5 on coding tests and will be fully open by November 4.