Claude Mythos 5vsMuse Glimmer
Claude Mythos 5 | Muse Glimmer | |
|---|---|---|
| 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. | — | 30B |
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 | ||
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. | — | $0.30DeepInfra |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | — | $1.10Parasail |
| Benchmarks | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 95.5% | 76% |
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. | 88% | 51.7% |
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. | 85% | 65.9% |
| BenchmarksPublished by one model only | ||
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. | — | 51.2% |
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. | — | 75.5% |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | 88% | — |
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. | — | 22% |
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. | 64.5% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 83.5% |
GDPval-AA v2Knowledge work — economically valuable knowledge work (v2, re-based Elo) | — | 953 |
CharXiv ReasoningChart reasoning — Can the AI read and reason about complex charts and figures, not just text? Higher is better. | — | 78.8% |
MMMU-ProMultimodal reasoning — A tougher version of MMMU — college-level questions that mix images, diagrams, and text together. Higher is better. | — | 74% |
Arena Elo (Code)Community preference (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. | — | 1359 |
| Overview | ||
| Company | Anthropic | Meta |
| Release date | Jun 9 2026 | Aug 10 2026 |
| Access | Proprietary | Open Weight |
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Frequently asked questions
Claude Mythos 5 leads Muse Glimmer on 3 of the 3 benchmarks they both report (SWE-Bench Verified, Terminal-Bench 2.1, OSWorld-Verified). Claude Mythos 5 shipped 62 days before Muse Glimmer, so benchmark comparisons should account for the intervening progress.
Claude Mythos 5 is proprietary, while Muse Glimmer is open weight.
On SWE-Bench Verified, Claude Mythos 5 leads at 95.5% vs Muse Glimmer at 76%. On Terminal-Bench 2.1, Claude Mythos 5 leads at 88% vs Muse Glimmer at 51.7%. On OSWorld-Verified, Claude Mythos 5 leads at 85% vs Muse Glimmer at 65.9%.
Claude Mythos 5 was released by Anthropic on Jun 9 2026.
Muse Glimmer was released by Meta on Aug 10 2026.
Claude Mythos 5 leads on SWE-Bench Verified — Claude Mythos 5 95.5% vs Muse Glimmer 76%.
Claude Mythos 5 is a proprietary model released by Anthropic. Muse Glimmer is an open weight model released by Meta.