GPT-6.1 Sol vs Muse Spark Open: Specs & Benchmark Comparison
GPT-6.1 Sol is developed by OpenAI, while Muse Spark Open comes from Meta. GPT-6.1 Sol was released in September 2026, and Muse Spark Open followed a month later in October 2026. Muse Spark Open has a published size of about 816 billion parameters; OpenAI has not disclosed the parameter count of GPT-6.1 Sol.
We have 17 benchmark results for GPT-6.1 Sol and 17 benchmark results for Muse Spark Open, but they overlap on a single test: DeepSWE 1.1, where GPT-6.1 Sol scores 75.2% against 60.0%.
Muse Spark Open is the cheaper API at $1.25 per million input tokens and $4.25 per million output tokens, about 60% below GPT-6.1 Sol at $2 and $10. Both accept a context window of about 1M tokens. GPT-6.1 Sol accepts text and images as input, while Muse Spark Open accepts text, images, audio, and video.
| Characteristic | GPT-6.1 Sol | Muse Spark Open |
|---|---|---|
| Company | OpenAI | Meta |
| Release Date | September 29, 2026 | October 15, 2026 |
| Parameters | — | 816B |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 1.0M |
| Context (output) | 128K | 1.0M |
| Input Price / 1M | $2.00 | $1.25 |
| Output Price / 1M | $10.00 | $4.25 |
| Average Score | 62.8% | 62.3% |
| Benchmarks | ||
| DeepSWE 1.1 | 75.2% | 60.0% |
Visual Benchmark Comparison
Verdict
Muse Spark Open leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-6.1 Sol — 0.6, Muse Spark Open — 0.6.
Muse Spark Open is 2.2x cheaper: input $1.25/1M vs $2.00/1M tokens.
GPT-6.1 Sol supports a larger context: 1M vs 1M tokens.
Muse Spark Open is newer: released 10/15/2026 vs 9/29/2026.
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Frequently Asked Questions
Which is better for coding — GPT-6.1 Sol or Muse Spark Open?
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Which has a larger context window — GPT-6.1 Sol or Muse Spark Open?
The GPT-6.1 Sol and Muse Spark Open comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-6.1 Sol or Muse Spark Open page. See also the complete list of AI model comparisons.