Muse Spark 1.2 vs GPT-5.6 Terra: side-by-side summary

Muse Spark 1.2 and GPT-5.6 Terra are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Muse Spark 1.2, from Meta, has a 1,048,576-token context window and is priced at $1.25/M tokens input, $4.25/M tokens output on OpenRouter.

GPT-5.6 Terra, from OpenAI, has a 1,050,000-token context window and is priced at $1/M tokens input, $6/M tokens output on OpenRouter.

Context window

• Muse Spark 1.2: 1,048,576 tokens
• GPT-5.6 Terra: 1,050,000 tokens

Price

• Muse Spark 1.2: $1.25/M tokens input, $4.25/M tokens output
• GPT-5.6 Terra: $1/M tokens input, $6/M tokens output

Provided by

• Muse Spark 1.2: Meta
• GPT-5.6 Terra: OpenAI

• Muse Spark 1.2 model details, providers and pricing
• GPT-5.6 Terra model details, providers and pricing