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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Muse Spark Open (Meta) and Step 5 Preview (StepFun).
| Metric / Capability | Muse Spark Open | Step 5 Preview |
|---|---|---|
| Developer / Organization | Meta | StepFun |
| Release Date | 2026-10-15 | 2026-10-08 |
| Deployment / Weights | Open Weights | Open Weights |
| Context Window | 1.0M tokens (1,048,576 tokens) | 1.0M tokens (1,048,576 tokens) |
| Input Pricing (/1M Tokens) | Free (Open Weights) | Free (Open Weights) |
| Output Pricing (/1M Tokens) | Free (Open Weights) | Free (Open Weights) |
| Benchmark / Domain | Muse Spark Open | Step 5 Preview | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | — | 43.7% | — |
Artificial Analysis Coding Agent Index v2.0 Composite index of coding-agent systems (model + harness) across FrontierCode v1.1, SWE-Atlas-QnA, and Terminal-Bench v4. | 26.3% | 43.1% | Step 5 Preview (+64%) |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | — | 33.3% | — |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 57.5% | — | — |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | — | 93.5% | — |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | — | 46.5% | — |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1338 | — | — |
Step 5 Preview outperforms Muse Spark Open across 1 evaluated benchmarks compared to 0 for Muse Spark Open, excelling in Artificial Analysis Coding Agent Index v2.0.
Both models feature equivalent context windows of 1.0M tokens (1,048,576 tokens).
Both models have comparable pricing structures or open weight deployment options.
Muse Spark Open is an open-weights model. Step 5 Preview is an open-weights model.
Analyze 130+ models side-by-side using interactive radar charts, cost-efficiency quadrant plots, and live dataset filters on the full NeuBench index.
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