# Claude Sonnet 4.5 (latest) vs Muse Spark 1.3 Contributor - AI Model Comparison

- Page: https://opencode.ai/data/compare/anthropic/claude-sonnet-4-5/meta/muse-spark-1-3-contributor
- Updated: 2026-10-02T12:41:07.000Z

|  | Claude Sonnet 4.5 (latest) | Muse Spark 1.3 Contributor |
| --- | --- | --- |
| Lab | Anthropic | Meta |
| Context window | 200K | 1M |
| Max output | 64K | 131K |
| Input modalities | text, image, pdf | text, image, video, pdf, audio |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | No |
| Release date | 2025-09-29 | 2026-09-02 |
| Input price per 1M tokens | $3.00 | $0.10 |
| Output price per 1M tokens | $15.00 | $0.20 |
| Cached input price per 1M tokens | $0.30 | $0.0020 |
| OpenCode tokens: past 2 months | 0 | 149T |
| Share of all tokens | 0% | 16% |
| Rank by tokens last week | - | #3 |
| Unique users | 0 | 984K |
| Weekly retention | - | 67.5% |

Model pages: [Claude Sonnet 4.5 (latest)](https://opencode.ai/data/anthropic/claude-sonnet-4-5.md), [Muse Spark 1.3 Contributor](https://opencode.ai/data/meta/muse-spark-1-3-contributor.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.