Kimi K2 Thinking API
About
Build advanced reasoning agents with Kimi K2 Thinking, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.60/1M input and $2.50/1M output tokens, native tool calling support, open weights architecture. Access Kimi K2 Thinking via the Vertex API with up to 262K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
262K
Tokens
Input Limit
262K
Tokens
Max Output
262K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.60
Output
$2.50
Caching (per 1M tokens)
Read
$0.06
Frequently Asked Questions
Kimi K2 Thinking by Vertex costs $0.60 per 1M input tokens and $2.50 per 1M output tokens. Cached reads cost $0.06 per 1M tokens.
Model Details
ID
moonshotai/kimi-k2-thinking-maas
Provider
VertexFamily
kimi-thinking
Release Date
Nov 13, 2025
Knowledge Cutoff
Aug 1, 2024
API Integration
NPM Package
@ai-sdk/google-vertex
Environment Variables
GOOGLE_VERTEX_PROJECT
GOOGLE_VERTEX_LOCATION
GOOGLE_APPLICATION_CREDENTIALS