Kimi K1.5
by Moonshot AI
Reasoning-focused upgrade (January 2025). Claimed parity with OpenAI o1 on math, coding, and multimodal reasoning. Limited public benchmarking. Intermediate step between K1 and K2.
Release
- Date: January 20, 2025
- Focus: Reasoning-first architecture
- Architecture: Undisclosed
Capabilities
- Advanced reasoning across math, coding, multimodal tasks
- Claimed o1-level performance on benchmark problems
- Multi-step problem-solving
Positioning
- Focused on reasoning depth rather than breadth
- Intermediate between K1 baseline and K2’s production scaling
- Limited consumer deployment
Performance
- Claimed parity with OpenAI o1 (unverified by independent benchmarks)
- Specific benchmark results not comprehensively disclosed
- Emphasis on qualitative reasoning improvements
Market Status
- Limited public availability
- Overshadowed by K2’s open-weight release (July 2025)
- Served as reasoning research foundation for K2/K2.5