GPT-6.1 Terra vs Muse Spark Open
Detailed technical comparison between GPT-6.1 Terra (OpenAI) and Muse Spark Open (Meta). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
GPT-6.1 Terra
1,050,000 tokensTie
Equal CapabilityTie
Equal SpeedGPT-6.1 Terra
$1.00 / MTokGPT-6.1 Terra
GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol. It is suited for everyday agentic, coding, and writing work, is particularly strong at understanding screenshots...
Muse Spark Open
Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers...
Technical Specifications
🏆 = Superior Spec| Specification | GPT-6.1 Terra | Muse Spark Open |
|---|---|---|
| Provider | OpenAI | Meta |
| Context Window | 1,050,000 tokens🏆 | 1,048,576 tokens |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | managed api | managed api |
| Production Stability | Not verified | Not verified |
| API Available | Yes | Yes |
| Released Date | 2026-10-26 | 2026-10-15 |
API Pricing Comparison
Input Price per Million Tokens
GPT-6.1 Terra
$1.00
Muse Spark Open
$1.25
Output Price per Million Tokens
GPT-6.1 Terra
$5.00
Muse Spark Open
$4.25
💡 Cost Ratio: GPT-6.1 Terra is 1.3x cheaper per input token than Muse Spark Open.
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Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
GPT-6.1 Terra Quirks & Gotchas
No developer gotchas reported.
Muse Spark Open Quirks & Gotchas
No developer gotchas reported.
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