Muse Spark 1.2 vs GPT-6 Astra

Muse Spark 1.2 and GPT-6 Astra are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

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.

GPT-6 Astra, from OpenAI, has a 1,050,000-token context window, costs $10.00/1M input and $50.00/1M output tokens and scores 50.9 on the Artificial Analysis Intelligence Index.

Muse Spark 1.2 is the cheapest on input, 8× cheaper than the next model, GPT-6 Astra has the largest context window, GPT-6 Astra scores highest for intelligence and GPT-6 Astra leads on coding.