Self-hosting and data control
Choose Muse Spark Open
Muse Spark Open has open weights, so you can run it on your own servers; GPT-6.1 Terra Pro is only available through its provider.
GPT-6.1 Terra Pro vs Muse Spark Open: price, context and capabilities
Choose GPT-6.1 Terra Pro for images as input and the latest release. Choose Muse Spark Open for self-hosting and data control.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Only GPT-6.1 Terra Pro offers vision, structured output, prompt caching.
- Only Muse Spark Open offers self-hostable.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Images as input
Choose GPT-6.1 Terra Pro
GPT-6.1 Terra Pro accepts images as input; Muse Spark Open does not.
Latest release
Choose GPT-6.1 Terra Pro
GPT-6.1 Terra Pro is the newer release (Oct 26, 2026, against Oct 15, 2026 for Muse Spark Open).
Specifications side by side
| GPT-6.1 Terra Pro | Muse Spark Open | |
|---|---|---|
| Provider | OpenAI | Meta |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $2.00 / 1M tokens | No data |
| Input | $1.00 / 1M tokens | No data |
| Output | $5.00 / 1M tokens | No data |
| Cached input | $0.05 / 1M tokens | No data |
| Context window | 1.05M | No data |
| Max output | 128k | No data |
| Released | Oct 26, 2026 | Oct 15, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Open weights |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching | Reasoning, Tool calling, Self-hostable |
| API model id | gpt-6.1-terra-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-6.1 Terra Pro | Muse Spark Open |
|---|---|---|
| Intelligence Index | No data | 38.9 |
| SciCode | No data | 58.4% |
| GPQA Diamond | No data | 89% |
| Humanity's Last Exam | No data | 43.9% |
| MMMU-Pro (visual reasoning) | No data | 80.9% |
| Long-context reasoning (AA-LCR) | No data | 78.3% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose GPT-6.1 Terra Pro or Muse Spark Open?
Choose GPT-6.1 Terra Pro for images as input and the latest release. Choose Muse Spark Open for self-hosting and data control.
Which is cheaper, GPT-6.1 Terra Pro or Muse Spark Open?
A price comparison is not possible: one of them has no comparable published price.
What is the difference between GPT-6.1 Terra Pro and Muse Spark Open?
GPT-6.1 Terra Pro is made by OpenAI and Muse Spark Open by Meta. A price comparison is not possible: one of them has no comparable published price. Only GPT-6.1 Terra Pro offers vision, structured output, prompt caching. Only Muse Spark Open offers self-hostable.
Which is newer, GPT-6.1 Terra Pro or Muse Spark Open?
GPT-6.1 Terra Pro was released on Oct 26, 2026 and Muse Spark Open on Oct 15, 2026.