Kimi K2.5 Turbo API
About
Build advanced reasoning agents with Kimi K2.5 Turbo, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support, open weights architecture. Access Kimi K2.5 Turbo via the Fireworks AI API with up to 256K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Structured Output
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
256K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Frequently Asked Questions
Kimi K2.5 Turbo by Fireworks AI costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens.
Model Details
ID
accounts/fireworks/routers/kimi-k2p5-turbo
Provider
Fireworks AIFamily
kimi-thinking
Release Date
Jan 27, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FIREWORKS_API_KEY
API Base URL
https://api.fireworks.ai/inference/v1/