Muse GlimmervsComposer 1.5
Muse Glimmer | Composer 1.5 | |
|---|---|---|
| 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% | — |
Next.js coding Next.js EvalsVercel'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. | — | 67% |
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. | 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% | — |
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. | 1359 | — |
| Overview | ||
| Company | Meta | SpaceXAI |
| Release date | Aug 10 2026 | Feb 9 2026 |
| Access | Open Weight | Proprietary |
Which is better: Muse Glimmer or Composer 1.5?
Muse Glimmer and Composer 1.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Composer 1.5 shipped 182 days before Muse Glimmer, so benchmark comparisons should account for the intervening progress.
Muse Glimmer is open weight, while Composer 1.5 is proprietary.
Direct benchmark comparisons are unavailable — Muse Glimmer and Composer 1.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
Muse Glimmer was released by Meta on Aug 10 2026.
Composer 1.5 was released by SpaceXAI on Feb 9 2026.
Muse Glimmer is an open weight model released by Meta. Composer 1.5 is a proprietary model released by SpaceXAI.
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