Claude Opus 4vsMuse Glimmer
Claude Opus 4 | Muse Glimmer | |
|---|---|---|
| Specifications | ||
Parameters | — | 30B |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given 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. | 34% | — |
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. | — | 51.2% |
Coding SWE-Bench VerifiedReal 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. | 72.5% | 76%Best |
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. | — | 51.7% |
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. | — | 75.5% |
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. | — | 22% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | 83.5%Best |
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. | — | 65.9% |
Knowledge work GDPval-AA v2economically valuable knowledge work (v2, re-based Elo) | — | 953 |
Chart reasoning CharXiv ReasoningCan the AI read and reason about complex charts and figures, not just text? Higher is better. | — | 78.8% |
Multimodal reasoning MMMU-ProA tougher version of MMMU — college-level questions that mix images, diagrams, and text together. Higher is better. | — | 74% |
| Overview | ||
| Company | Anthropic | Meta |
| Release date | May 22 2025 | Aug 10 2026 |
| Access | Proprietary | Open Weight |
Which is better: Claude Opus 4 or Muse Glimmer?
Muse Glimmer leads Claude Opus 4 on 2 of the 2 benchmarks they both report (SWE-Bench Verified, GPQA Diamond). Claude Opus 4 shipped 445 days before Muse Glimmer, so benchmark comparisons should account for the intervening progress.
Claude Opus 4 is proprietary, while Muse Glimmer is open weight.
On SWE-Bench Verified, Muse Glimmer leads at 76% vs Claude Opus 4 at 72.5%. On GPQA Diamond, Muse Glimmer leads at 83.5% vs Claude Opus 4 at 79.6%.
Frequently asked questions
Claude Opus 4 was released by Anthropic on May 22 2025.
Muse Glimmer was released by Meta on Aug 10 2026.
Muse Glimmer leads on SWE-Bench Verified — Claude Opus 4 72.5% vs Muse Glimmer 76%.
Muse Glimmer leads on GPQA Diamond — Claude Opus 4 79.6% vs Muse Glimmer 83.5%.
Claude Opus 4 is a proprietary model released by Anthropic. Muse Glimmer is an open weight model released by Meta.