K2 Think vs. Inkling

K2 Think is an innovative open-source advanced reasoning model that has emerged from a collaborative effort between the Institute of Foundation Models at MBZUAI and G42. Despite having a relatively modest size of 32 billion parameters, K2 Think delivers performance that competes with top-tier models that possess much larger parameter counts. Its primary strength is in mathematical reasoning, where it has achieved excellent rankings on distinguished benchmarks, including AIME ’24/’25, HMMT ’25, and OMNI-Math-HARD. This model is part of a broader initiative aimed at developing open models in the UAE, which also encompasses Jais (for Arabic), NANDA (for Hindi), and SHERKALA (for Kazakh). It builds on the foundational work laid by the K2-65B, a fully reproducible open-source foundation model that was introduced in 2024. K2 Think is designed to be open, efficient, and versatile, featuring a web app interface that encourages user interaction and exploration. Its cutting-edge approach to parameter positioning signifies a notable leap forward in creating compact architectures for high-level AI reasoning. Furthermore, its development underscores a commitment to improving access to advanced AI technologies across multiple languages and sectors, ultimately fostering greater inclusivity in the field.

Inkling is an open-weights multimodal AI model from Thinking Machines built to support customization, agentic workflows, coding, reasoning, vision, audio, and enterprise AI use cases. The model is a Mixture-of-Experts transformer with 975 billion total parameters, 41 billion active parameters, 256 routed experts per MoE layer, and six routed experts active per token. It supports context windows up to 1 million tokens and was pretrained on 45 trillion tokens across text, images, audio, and video. Inkling is designed as a broad foundation model rather than a narrowly optimized benchmark model, giving it balanced capabilities across reasoning, coding, factuality, instruction following, vision, audio, tool use, and safety. Its controllable thinking effort lets developers adjust how much computation and generated reasoning the model uses, helping teams balance quality, latency, and cost for different production needs. The model can run agentic coding tasks, use tools, create web apps, generate polished multi-page artifacts, reason over long contexts, and work through iterative refinement loops. For multimodal tasks, Inkling can process images, answer questions about visual content, transcribe and reason over audio, follow spoken instructions, and combine visual reasoning with code-based tools such as Python. Thinking Machines trained Inkling for calibration, instruction following, factual reliability, refusal behavior, and safety across multiple modalities, including evaluations for dangerous capabilities and human-AI threat vectors. Inkling is available on Tinker for fine-tuning, with 64K and 256K context options, an Inkling Playground for testing, cookbook recipes, and support for multimodal post-training workflows. Its full weights are available on Hugging Face, and deployment support is available through APIs and infrastructure partners such as TogetherAI, Fireworks, Modal, Databricks, Baseten, SGLang, vLLM, llama.cpp, and transformers.