AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — Meta
Muse Spark Open is an open-weight mixture-of-experts model from Meta, released on October 15, 2026, with 816B total and 42B active parameters. It takes text, image, video and audio input and returns text. Meta's own Model API does not serve it: it is self-hosted or run through hosted providers.
Model B — Tencent
Hy4 is Tencent's latest-generation large language model, launched on November 4, 2026 after the Hy4 Preview. It is the first in the line with visual understanding and computer use; Tencent says it will publish the weights and a system card later.
| Property | Muse Spark Open | Hy4 |
|---|---|---|
| Released | Oct 15, 2026 | Nov 4, 2026 |
| Developer | Meta | Tencent |
| Type | multimodal | multimodal |
| License | open-weight | proprietary |
| Context window | 1,048,576 | — |
| Parameters | 816B total, 42B active (mixture of experts) | — |
| Developer status | — | — |
| Input $/M tokens | — | — |
| Output $/M tokens | — | — |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
Programmatic access available at /api/ai/compare?a=muse-spark-open&b=tencent-hy4. CORS is open. Citation guidance: /about/editorial-process.