Kimi K2 Thinking

Kimi K2 Thinking

Moonshot AI
Span-01

Span-01

Respan
+
+

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About

Kimi K2 Thinking is an advanced open source reasoning model developed by Moonshot AI, designed specifically for long-horizon, multi-step workflows where the system interleaves chain-of-thought processes with tool invocation across hundreds of sequential tasks. The model uses a mixture-of-experts architecture with a total of 1 trillion parameters, yet only about 32 billion parameters are activated per inference pass, optimizing efficiency while maintaining vast capacity. It supports a context window of up to 256,000 tokens, enabling the handling of extremely long inputs and reasoning chains without losing coherence. Native INT4 quantization is built in, which reduces inference latency and memory usage without performance degradation. Kimi K2 Thinking is explicitly built for agentic workflows; it can autonomously call external tools, manage sequential logic steps (up to and typically between 200-300 tool calls in a single chain), and maintain consistent reasoning.

About

Span-01 is a hyper-parallel reasoning classifier built to detect complex behaviors across long production traces in a single forward pass. Rather than generating tokens sequentially, it reasons over natural-language behavior definitions and returns direct probabilities for present, absent, and not_observable. The model is trained for general classification reasoning with RLAIF before being specialized for behavior detection, allowing it to apply previously unseen definitions to new behaviors and domains instead of relying on a fixed taxonomy. At inference time, hyper-parallel definition branches evaluate multiple behaviors against the same trace context simultaneously, while hybrid attention helps preserve reasoning over long, complex inputs. Span-01 is designed for production monitoring across safety, reliability, grounding, agent behavior, and response quality, including jailbreak and prompt injection detection, privacy, and secrets.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers and AI research teams seeking a solution for building autonomous agents, multi-step reasoning systems and tool-enabled workflows

Audience

AI, safety, evaluation, and observability teams seeking to detect and score complex behaviors across long production traces with fast, probability-based classification

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Pricing

$199 per month
Free Version Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Company Information

Moonshot AI
Founded: 2023
United States
moonshotai.github.io/Kimi-K2/thinking.html

Company Information

Respan
Founded: 2023
United States
www.respan.ai/blog/introducing-span-1

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Categories

AI Coding Models Supported
AI Models Supported
Foundation Models Supported

Categories

AI Decision Models Supported

Integrations

AssemblyAI Not Supported
GPT-5.1 Supported
GPT-5.2 Supported
GPT-5.2 Instant Supported
GPT-5.2 Pro Supported
GPT-5.3 Instant Supported
GPT-5.4 nano Supported
GPT-5.5 Supported
GPT-5.5 Pro Supported
GPT-5.6 Luna Supported
GPT-5.6 Sol Supported
GPT-6 Astra Supported
GPT-6 Luna Supported
GPT-6.1 Sol Supported
Google GenAI SDK Not Supported
Holo4 Supported
JavaScript Not Supported
LlamaIndex Not Supported
Nebius Token Factory Supported
Oxlo.ai Supported

Integrations

AssemblyAI Supported
GPT-5.1 Not Supported
GPT-5.2 Not Supported
GPT-5.2 Instant Not Supported
GPT-5.2 Pro Not Supported
GPT-5.3 Instant Not Supported
GPT-5.4 nano Not Supported
GPT-5.5 Not Supported
GPT-5.5 Pro Not Supported
GPT-5.6 Luna Not Supported
GPT-5.6 Sol Not Supported
GPT-6 Astra Not Supported
GPT-6 Luna Not Supported
GPT-6.1 Sol Not Supported
Google GenAI SDK Supported
Holo4 Not Supported
JavaScript Supported
LlamaIndex Supported
Nebius Token Factory Not Supported
Oxlo.ai Not Supported
Claim Kimi K2 Thinking and update features and information
Claim Kimi K2 Thinking and update features and information
Claim Span-01 and update features and information
Claim Span-01 and update features and information