Muse Spark 1.1vsKimi K3
Muse Spark 1.1 | Kimi K3 | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | — | 2.8T |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | — | 1M |
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $1.25 | $3.00 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $4.25 | $15.00 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | — | $0.30 |
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | — | $2.55Makora |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | — | $12.75Makora |
| Benchmarks | ||
DeepSWE 1.1Agentic coding — Artificial 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% | 69% |
Terminal-Bench 2.1Agentic terminal coding — Can 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% |
MCP AtlasMulti-step tool use — Can 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% | 84.2% |
JobBenchProfessional tool use — Tests 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% | 52.9% |
Toolathlon-VerifiedPersonal tool use — Tests 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% | 73.2% |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity'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% | 56% |
CharXiv ReasoningChart reasoning — Can the AI read and reason about complex charts and figures, not just text? Higher is better. | 88.4% | 84.8% |
| BenchmarksPublished by one model only | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 73% |
SWE-Bench ProAgentic coding — Can 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% | — |
DeepSWE 1.0Agentic coding — Artificial 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 EvalsNext.js coding — Vercel'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. | — | 81% |
Supabase Evals · with skillsSupabase coding — Supabase's own open benchmark: a coding agent is dropped into a real Supabase project and asked to do real work — set up a schema, fix a broken security policy, debug an Edge Function — and every run is checked against a live Supabase stack. This is the headline number, where the agent has Supabase's own skills loaded, as most people building on Supabase would. The score is the share of scenarios it got right. Higher is better. | — | 86.4% |
Supabase Evals · no skillsSupabase coding — The same Supabase scenarios, but with none of Supabase's skills loaded — so it measures what the model already knows about building on Supabase, rather than how well it follows Supabase's supplied instructions. Higher is better. | — | 90.9% |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | — | 91.2% |
Humanity's Last Exam · no toolsMultidisciplinary reasoning — Humanity'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% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 93.5% |
OSWorld-VerifiedAgentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 80.8% | — |
Finance Agent v2Agentic financial analysis — Tests the AI on real financial-analysis work, like digging through reports and making sound decisions. Higher is better. | 57.2% | — |
Harvey's Legal Agent BenchmarkAgentic legal work — Harvey'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% | — |
TaxEval v2Tax questions — A 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% | — |
MedScribeMedical admin work — Can the AI support doctors with their administrative work, like notes and paperwork? Created by Vals AI. Higher is better. | 88.89% | — |
GDPval-AA v2Knowledge work — economically valuable knowledge work (v2, re-based Elo) | — | 1668 |
BabyVisionVisual reasoning — Tests core visual reasoning — seeing and understanding images the way even young children can, which AIs often find surprisingly hard. Higher is better. | 76.3% | — |
MMMU-ProMultimodal reasoning — A tougher version of MMMU — college-level questions that mix images, diagrams, and text together. Higher is better. | — | 81.6% |
| Overview | ||
| Company | Meta | Moonshot AI |
| Release date | Jul 9 2026 | Jul 16 2026 |
| Access | Proprietary | Open Weight |
Other comparisons
Muse Spark 1.1vsClaude Opus 5Kimi K3vsClaude Opus 5Muse Spark 1.1vsGPT-5.6 SolKimi K3vsGPT-5.6 SolMuse Spark 1.1vsGemini 3.7 FlashKimi K3vsGemini 3.7 FlashMuse Spark 1.1vsGrok 4.6Kimi K3vsGrok 4.6Muse Spark 1.1vsDeepSeek-V4-Pro-0813Kimi K3vsDeepSeek-V4-Pro-0813Muse Spark 1.1vsMistral Medium 3.5Kimi K3vsMistral Medium 3.5
Frequently asked questions
Muse Spark 1.1 leads Kimi K3 on 5 of the 7 benchmarks they both report. Muse Spark 1.1 is cheaper on both input and output: $1.25 vs $3.00 per million input tokens, and $4.25 vs $15.00 per million output tokens. 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 DeepSWE 1.1, Kimi K3 leads at 69% vs Muse Spark 1.1 at 53.3%. 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%.
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 DeepSWE 1.1 — Muse Spark 1.1 53.3% vs Kimi K3 69%.
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 cheaper on both input and output: $1.25 vs $3.00 per million input tokens, and $4.25 vs $15.00 per million output tokens. Rates are pay-as-you-go API prices verified on August 18, 2026.
Muse Spark 1.1 is a proprietary model released by Meta. Kimi K3 is an open weight model released by Moonshot AI.