Muse GlimmervsGPT-5.5-Cyber
Muse Glimmer | GPT-5.5-Cyber | |
|---|---|---|
| Specifications | ||
Parameters | 30B | — |
| 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. | 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. | 76% | — |
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% | — |
Cybersecurity CyberGymTests the AI on cybersecurity challenges — finding and exploiting software weaknesses inside a safe sandbox. Higher is better. | — | 85.6% |
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. | 83.5% | — |
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. | 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 | Meta | OpenAI |
| Release date | Aug 10 2026 | Jun 22 2026 |
| Access | Open Weight | Proprietary |
Which is better: Muse Glimmer or GPT-5.5-Cyber?
Muse Glimmer and GPT-5.5-Cyber don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.5-Cyber shipped 49 days before Muse Glimmer, so benchmark comparisons should account for the intervening progress.
Muse Glimmer is open weight, while GPT-5.5-Cyber is proprietary.
Direct benchmark comparisons are unavailable — Muse Glimmer and GPT-5.5-Cyber don't publish scores on any of the same benchmarks.
Frequently asked questions
Muse Glimmer was released by Meta on Aug 10 2026.
GPT-5.5-Cyber was released by OpenAI on Jun 22 2026.
Muse Glimmer is an open weight model released by Meta. GPT-5.5-Cyber is a proprietary model released by OpenAI.
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