# Muse Spark 1.3: AI model fact sheet

- **Provider:** meta
- **Released:** 2026-09-02
- **Context window:** 1,048,576 tokens
- **API pricing:** $1.25 / 1M input, $4.25 / 1M output
- **OpenRouter ID:** meta/muse-spark-1.3
- **Capabilities:** conversation, reasoning, code-generation, analysis, planning, agentic-tool-use, function-calling, tool-use

Meta's multimodal reasoning model for long-running agent and coding workflows. It tracks state across extended tasks, works through conflicting inputs and asks for confirmation when needed, with a 1M-token context window and concise execution. Access is restricted to adults.

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