Muse Spark 1.1 vs Kimi K3
Meta Muse Spark 1.1 | Moonshot AI Kimi K3 | |
|---|---|---|
| Overview | ||
| Company | Meta | Moonshot AI |
| Release date | Jul 9 2026 | Jul 16 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 2.8T |
Context window | — | 1M |
| Benchmarks | ||
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | 61.5% | — |
Agentic coding DeepSWE 1.1Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | 53.3% | — |
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% |
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. | 80% | 88.3%Best |
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. | 88.1%Best | 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. | 54.7%Best | 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. | 75.6%Best | 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. | 62.1%Best | 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% |
Agentic computer use OSWorld-VerifiedCan the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 80.8% | — |
Agentic financial analysis Finance Agent v2Tests the AI on real financial-analysis work, like digging through reports and making sound decisions. Higher is better. | 57.2% | — |
Agentic legal work Harvey's Legal Agent BenchmarkHarvey's test of whether an AI agent can complete real legal work — drafting and reviewing documents, working with spreadsheets and presentations, and navigating files the way a lawyer's assistant would. Higher is better. | 20% | — |
Tax questions TaxEval v2A set of real tax questions created by Vals AI — can the AI give accurate answers about tax rules and filings? Higher is better. | 79.72% | — |
Medical admin work MedScribeCan the AI support doctors with their administrative work, like notes and paperwork? Created by Vals AI. Higher is better. | 88.89% | — |
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. | 88.4%Best | 84.8% |
Visual reasoning BabyVisionTests core visual reasoning — seeing and understanding images the way even young children can, which AIs often find surprisingly hard. Higher is better. | 76.3% | — |
Multimodal reasoning MMMU-ProA tougher version of MMMU — college-level questions that mix images, diagrams, and text together. Higher is better. | — | 81.6% |
Community preference Arena Elo (Text)Real people chat with two anonymous AIs side by side and vote for the answer they prefer. Votes become a chess-style Elo rating on arena.ai — it measures which AI people actually like, not test scores. Higher is better. | 1490 | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1540 | — |
| Timeline | ||
| Release gap | Muse Spark 1.1 shipped 7 days before Kimi K3 | |
Which is better: Muse Spark 1.1 or Kimi K3?
Muse Spark 1.1 leads Kimi K3 on 5 of the 6 benchmarks they both report. Muse Spark 1.1 shipped 7 days before Kimi K3, so benchmark comparisons should account for the intervening progress.
Muse Spark 1.1 is proprietary, while Kimi K3 is open weight.
On Terminal-Bench 2.1, Kimi K3 leads at 88.3% vs Muse Spark 1.1 at 80%. On MCP Atlas, Muse Spark 1.1 leads at 88.1% vs Kimi K3 at 84.2%. On JobBench, Muse Spark 1.1 leads at 54.7% vs Kimi K3 at 52.9%. On Toolathlon-Verified, Muse Spark 1.1 leads at 75.6% vs Kimi K3 at 73.2%. On Humanity's Last Exam · with tools, Muse Spark 1.1 leads at 62.1% vs Kimi K3 at 56%. On CharXiv Reasoning, Muse Spark 1.1 leads at 88.4% vs Kimi K3 at 84.8%.
Frequently asked questions
Muse Spark 1.1 was released by Meta on Jul 9 2026.
Kimi K3 was released by Moonshot AI on Jul 16 2026.
Kimi K3 leads on Terminal-Bench 2.1 — Muse Spark 1.1 80% vs Kimi K3 88.3%.
Muse Spark 1.1 leads on Humanity's Last Exam · with tools — Muse Spark 1.1 62.1% vs Kimi K3 56%.
Muse Spark 1.1 is a proprietary model released by Meta. Kimi K3 is an open weight model released by Moonshot AI.
Other comparisons
Muse Spark 1.1 vs Claude Sonnet 5Kimi K3 vs Claude Sonnet 5Muse Spark 1.1 vs GPT-5.6 SolKimi K3 vs GPT-5.6 SolMuse Spark 1.1 vs Gemini 3.5 FlashKimi K3 vs Gemini 3.5 FlashMuse Spark 1.1 vs Grok 4.5Kimi K3 vs Grok 4.5Muse Spark 1.1 vs DeepSeek-V4-ProKimi K3 vs DeepSeek-V4-ProMuse Spark 1.1 vs Mistral Medium 3.5Kimi K3 vs Mistral Medium 3.5