StepFun: Step 5 Preview vs Meta: Muse Spark 1.3
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-09.
| StepFun: Step 5 Preview | Meta: Muse Spark 1.3 | |
|---|---|---|
| Vendor | stepfun | meta |
| Quality Score | 100 | 100 |
| Benchmark Score | 74.2 | 82.3 |
| Input Price | $1.00/M | $1.25/M |
| Output Price | $2.70/M | $4.25/M |
| Context Window | 1,000,000 | 1,048,576 |
| Max Output | 64,000 | 943,718 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 72.2 | 79.4 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Step 5 Preview costs $1.68 and Muse Spark 1.3 costs $2.31, so Step 5 Preview is about 1.4 times cheaper for the same work.
Both take in a similar amount of text: 1,000,000 and 1,048,576 tokens, about 1,500 and 1,573 pages.
On our blended benchmark score Muse Spark 1.3 leads 82.3 to 74.2.
Across the 19 tasks where they differ, Step 5 Preview scores higher on 3 (Code Completion, JSON Extraction, Bulk Data Labeling), Muse Spark 1.3 on 16 (SQL Generation, Code Review, Code Refactoring and others).
Step 5 Preview was released in October 2026 and Muse Spark 1.3 in September 2026.
Pick Step 5 Preview if you need lower cost; pick Muse Spark 1.3 if you need benchmark performance or the stronger all-round task scores.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | StepFun: Step 5 Preview | Meta: Muse Spark 1.3 |
|---|---|---|
| SQL Generation | 142 | 143 |
| Code Review | 145 | 147 |
| Code Completion | 120 | 120 |
| Code Refactoring | 147 | 148 |
| Bug Fixing | 149 | 151 |
| Unit Test Generation | 132 | 133 |
| Code Documentation | 137 | 138 |
| Regex Writing | 126 | 126 |
| CI/CD Pipelines | 128 | 129 |
| Frontend Component Design | 130 | 131 |
| Data Analysis | 134 | 135 |
| CSV / Spreadsheet Cleanup | 136 | 136 |
| ETL Scripting | 138 | 139 |
| JSON Extraction | 123 | 122 |
| Bulk Data Labeling | 120 | 120 |
| OCR / Document Parsing | 134 | 135 |
| Table Extraction from PDFs | 134 | 135 |
| Long-Document Summarization | 149 | 150 |
| Blog Post Writing | 130 | 131 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →