PrismML: Ternary Bonsai 2 9B vs StepFun: Step 5 Preview
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-02.
| PrismML: Ternary Bonsai 2 9B | StepFun: Step 5 Preview | |
|---|---|---|
| Vendor | prism-ml | stepfun |
| Quality Score | 100 | 100 |
| Input Price | $0.08/M | $1.00/M |
| Output Price | $0.13/M | $2.70/M |
| Context Window | 262,144 | 1,048,576 |
| Max Output | 65,536 | 64,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Ternary Bonsai 2 9B costs $0.11 and Step 5 Preview costs $1.68, so Ternary Bonsai 2 9B is about 14.9 times cheaper for the same work.
Step 5 Preview reads up to 1,048,576 tokens at once, roughly 1,573 pages of text, against about 393 pages for Ternary Bonsai 2 9B.
Only Step 5 Preview offers video input.
Across the 18 tasks where they differ, Ternary Bonsai 2 9B scores higher on 5 (Code Completion, Regex Writing, JSON Extraction and others), Step 5 Preview on 13 (SQL Generation, Code Review, Code Refactoring and others).
Pick Ternary Bonsai 2 9B if you need lower cost; pick Step 5 Preview if you need long documents, video input 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 | PrismML: Ternary Bonsai 2 9B | StepFun: Step 5 Preview |
|---|---|---|
| SQL Generation | 131 | 133 |
| Code Review | 126 | 132 |
| Code Completion | 129 | 119 |
| Code Refactoring | 127 | 136 |
| Bug Fixing | 130 | 136 |
| Unit Test Generation | 121 | 124 |
| Code Documentation | 126 | 131 |
| Regex Writing | 120 | 119 |
| CI/CD Pipelines | 117 | 120 |
| CSV / Spreadsheet Cleanup | 128 | 133 |
| ETL Scripting | 122 | 128 |
| JSON Extraction | 132 | 123 |
| Bulk Data Labeling | 129 | 120 |
| OCR / Document Parsing | 128 | 131 |
| Table Extraction from PDFs | 128 | 131 |
| Long-Document Summarization | 129 | 137 |
| Short-Form Summarization | 124 | 115 |
| Blog Post Writing | 119 | 121 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →