# Muse Spark 1.3 Contributor: AI model fact sheet

- **Provider:** meta
- **Released:** 2026-09-02
- **Context window:** 1,048,576 tokens
- **API pricing:** $0.10 / 1M input, $0.20 / 1M output
- **OpenRouter ID:** meta/muse-spark-1.3-contributor
- **Capabilities:** conversation, reasoning, code-generation, analysis, planning, agentic-tool-use, function-calling, tool-use

Meta's lower-cost Muse Spark 1.3 tier for experiments, learning, coding and early agent workflows. It follows information across long tasks and asks for confirmation when inputs conflict. Access is restricted to adults; prompts and outputs may be used to improve Meta's products.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/muse-spark-1.3-contributor