Composer 2 vs Kimi K3
Cursor Composer 2 | Moonshot AI Kimi K3 | |
|---|---|---|
| Overview | ||
| Company | Cursor | Moonshot AI |
| Release date | Mar 19 2026 | Jul 16 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 2.8T |
Context window | — | 1M |
| Benchmarks | ||
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | 73.7% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 52.2% | — |
Agentic coding DeepSWE 1.0Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. Higher is better. | — | 67.5% |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 75% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 88.3% |
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | 61.7% | — |
Multi-step tool use MCP AtlasCan the AI chain together many tools and steps to complete one bigger task, rather than doing just a single thing? Higher is better. | — | 84.2% |
Professional tool use JobBenchTests the AI on professional workplace tasks that require using real work tools — the kind of multi-step jobs an office worker handles. Higher is better. | — | 52.9% |
Personal tool use Toolathlon-VerifiedTests how well the AI uses everyday personal tools and apps to get things done — a human-checked version of Toolathlon. Higher is better. | — | 73.2% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 91.2% |
Multidisciplinary reasoning Humanity's Last Exam · no toolsHumanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. | — | 43.5% |
Multidisciplinary reasoning Humanity's Last Exam · with toolsHumanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 56% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 93.5% |
Knowledge work GDPval-AA v2economically valuable knowledge work (v2, re-based Elo) | — | 1668 |
Chart reasoning CharXiv ReasoningCan the AI read and reason about complex charts and figures, not just text? Higher is better. | — | 84.8% |
Multimodal reasoning MMMU-ProA tougher version of MMMU — college-level questions that mix images, diagrams, and text together. Higher is better. | — | 81.6% |
| Timeline | ||
| Release gap | Composer 2 shipped 119 days before Kimi K3 | |
Which is better: Composer 2 or Kimi K3?
Composer 2 and Kimi K3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Composer 2 shipped 119 days before Kimi K3, so benchmark comparisons should account for the intervening progress.
Composer 2 is proprietary, while Kimi K3 is open weight.
Direct benchmark comparisons are unavailable — Composer 2 and Kimi K3 don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 2 was released by Cursor on Mar 19 2026.
Kimi K3 was released by Moonshot AI on Jul 16 2026.
Composer 2 is a proprietary model released by Cursor. Kimi K3 is an open weight model released by Moonshot AI.
Other comparisons
Composer 2 vs Claude Sonnet 5Kimi K3 vs Claude Sonnet 5Composer 2 vs GPT-5.6 SolKimi K3 vs GPT-5.6 SolComposer 2 vs Gemini 3.5 FlashKimi K3 vs Gemini 3.5 FlashComposer 2 vs Muse Spark 1.1Kimi K3 vs Muse Spark 1.1Composer 2 vs Grok 4.5Kimi K3 vs Grok 4.5Composer 2 vs DeepSeek-V4-ProKimi K3 vs DeepSeek-V4-Pro