# Muse Spark 1.3 Contributor vs GPT-5.1 Codex mini - AI Model Comparison

- Page: https://opencode.ai/data/compare/meta/muse-spark-1-3-contributor/openai/gpt-5-1-codex-mini
- Updated: 2026-10-02T09:36:21.000Z

|  | Muse Spark 1.3 Contributor | GPT-5.1 Codex mini |
| --- | --- | --- |
| Lab | Meta | OpenAI |
| Context window | 1M | 400K |
| Max output | 131K | 128K |
| Input modalities | text, image, video, pdf, audio | text, image |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | No |
| Release date | 2026-09-02 | 2025-11-13 |
| Input price per 1M tokens | $0.10 | $0.20 |
| Output price per 1M tokens | $0.20 | $1.60 |
| Cached input price per 1M tokens | $0.0020 | $0.02 |
| OpenCode tokens: past 2 months | 148T | 0 |
| Share of all tokens | 16% | 0% |
| Rank by tokens last week | #3 | - |
| Unique users | 981K | 0 |
| Weekly retention | 67.5% | - |

Model pages: [Muse Spark 1.3 Contributor](https://opencode.ai/data/meta/muse-spark-1-3-contributor.md), [GPT-5.1 Codex mini](https://opencode.ai/data/openai/gpt-5-1-codex-mini.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.