Kimi K2 Thinking
Cheapest of 7 routes · AWS Bedrock
About
Extended thinking variant of Kimi K2 with native reasoning capabilities. 256K context.
Overview
Kimi K2 Thinking is a reasoning-specialized model developed by Moonshot AI, produced by post-training the Kimi K2 foundation model for extended chain-of-thought reasoning. Kimi K2 is a trillion-parameter mixture-of-experts model that activates 32 billion parameters per forward pass, organized with 384 total experts from which 8 are routed per token plus 1 shared expert per token. The model supports a 256,000-token context window. Kimi K2 was trained on 15.5 trillion tokens using Moonshot's proprietary MuonClip optimizer, which enabled training without instabilities at that scale.
The K2 Thinking post-training adapts the base model to interleave extended reasoning steps with tool calls, enabling it to sustain coherent multi-step task execution across hundreds of sequential actions without drift. This makes it appropriate for autonomous coding, research workflows, and planning tasks that require long chains of intermediate reasoning. K2 Thinking ships in INT4 precision via quantization-native post-training, reducing serving cost compared to FP16 inference.
The model is available via Fireworks AI, OpenRouter, NVIDIA NIM, AWS Bedrock, Google Vertex AI, Novita AI, and the Vercel AI Gateway. It is the reasoning-optimized variant of the Kimi K2 family; the base Kimi K2 Instruct variant is the non-thinking counterpart for standard instruction-following tasks.
Providers(7)
Compare all 7Compare API pricing across 7 tracked provider routes for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| AWS Bedrock | $0.600 | $2.50 | - | Serverless Scheduled retirement: March 30, 2027 |
| Fireworks AI | $0.600 | $2.50 | - | Serverless |
| GCP Vertex AI | $0.600 | $2.50 | - | Serverless |
| Novita AI | $0.600 | $2.50 | - | Serverless |
| OpenRouter | $0.600 | $2.50 | - | Serverless |
| Vercel AI Gateway | $0.600 | $2.50 | read $0.150 | Serverless |
| NVIDIA NIM | - | - | - | ServerlessPartial |
Available via routers & gateways(15)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Amazon Bedrock Intelligent Prompt Routing
RouterAWS Bedrock's native intelligent prompt router that routes prompts between Anthropic Claude model tiers (Haiku/Sonnet) based on predicted task complexity, with no extra per-routing charge.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Compare Kimi K2 Thinking with other models
Comparison and alternatives
Browse all comparisons →Cheapest of 7 routes · AWS Bedrock