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GPT-5.5 vs Muse Spark

GPT-5.5 leads in 3 of 8 categories

Arena ELO

Tie

Cheaper

GPT-5.5

Faster

Tie

Detailed Comparison

CategoryGPT-5.5Muse Spark
ProviderOpenAI Meta
Context Window128K WINN/A
Input Price ($/1M)$5 WINN/A
Output Price ($/1M)$30 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo No

Frequently Asked Questions

Which has a larger context window?

GPT-5.5 supports 128K context, while Muse Spark supports N/A.

Is GPT-5.5 or Muse Spark open source?

GPT-5.5 is proprietary. Muse Spark is proprietary.

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