# Muse Spark 1.2 Contributor vs fledge-alpha - AI Model Comparison

- Page: https://opencode.ai/data/compare/meta/muse-spark-1-2-contributor/unknown/fledge-alpha
- Updated: 2026-10-04T01:20:24.000Z

|  | Muse Spark 1.2 Contributor | fledge-alpha |
| --- | --- | --- |
| Lab | Meta | Unknown |
| Context window | 1M | - |
| Max output | 131K | - |
| Input modalities | text, image, video, pdf, audio | - |
| Reasoning | Yes | - |
| Tool calling | Yes | - |
| Open weights | No | - |
| Release date | 2026-08-05 | - |
| Input price per 1M tokens | $0.10 | - |
| Output price per 1M tokens | $0.20 | - |
| Cached input price per 1M tokens | $0.0020 | - |
| OpenCode tokens: past 2 months | 39T | 532B |
| Share of all tokens | 4.2% | 0.1% |
| Rank by tokens last week | #11 | #13 |
| Unique users | 457K | 8.8K |
| Weekly retention | 79.4% | - |

Model pages: [Muse Spark 1.2 Contributor](https://opencode.ai/data/meta/muse-spark-1-2-contributor.md), [fledge-alpha](https://opencode.ai/data/unknown/fledge-alpha.md)

## Methodology

- Updates: Aggregated every hour. Days and weeks use UTC.
- Tokens: Input, output, reasoning, and cached tokens for each request.
- Users and sessions: Approximate counts of distinct users and OpenCode sessions.
- Cost: Session cost is the average cost per OpenCode session. Token prices are list prices from the OpenCode model catalog.
- Retention: The share of a model's users in one week who use it again the next week.
- Citation: Cite OpenCode Data (opencode.ai/data) with the update time shown at the top of the page.