Claude Sonnet 5 vs Muse Spark 1.2

Claude Sonnet 5 and Muse Spark 1.2 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Sonnet 5, from Anthropic, has a 1,000,000-token context window, costs from $2.00/1M input and $10.00/1M output tokens across 2 providers and scores 38.2 on the Artificial Analysis Intelligence Index.

Muse Spark 1.2, from Meta, has a 1,048,576-token context window, costs $1.25/1M input and $4.25/1M output tokens and scores 39.6 on the Artificial Analysis Intelligence Index.

Muse Spark 1.2 is the cheapest on input, 1.6× cheaper than the next model, Muse Spark 1.2 has the largest context window, Muse Spark 1.2 scores highest for intelligence and Muse Spark 1.2 leads on coding.