# Muse Spark 1.3 Contributor

> Muse Spark 1.3 Contributor — Meta's reasoning model for agents and coding, with a 1M-token context. Requests may be used by Meta for training.

Canonical: https://routemux.com/meta/muse-spark-1.3-contributor
Provider: Meta

## Key facts

| Field | Value |
| --- | --- |
| Model ID | meta/muse-spark-1.3-contributor |
| Official model ID | muse-spark-1.3-contributor |
| Context window | 1M |
| Max output | 128K |
| Input modalities | text, image |
| Output modalities | text |
| Capabilities | Vision, Reasoning, Tool Calling, Coding, Cache |
| Upstream release | 2026-09-02 |
| Availability | available |

## Pricing

- RouteMux input: $0.05 per 1M tokens
- RouteMux output: $0.1 per 1M tokens
- Official input: $0.1 per 1M tokens
- Official output: $0.2 per 1M tokens
- Cache read: $0.001 per 1M tokens
- Saving vs official: 50%
- Official price source: official_x0.5, verified 2026-10-20

Billing is prepaid wallet, charged per successful request only.

## API access

Base URL: https://api.routemux.com

Supported protocols:

- openai_chat
- openai_responses