OpenAI: GPT-5.6 Terra Pro vs StepFun: Step 3.7 Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.6 Terra Pro | StepFun: Step 3.7 Flash | |
|---|---|---|
| Vendor | openai | stepfun |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 50.8 |
| Input Price | $2.00/M | $0.20/M |
| Output Price | $12.00/M | $1.15/M |
| Context Window | 1,050,000 | 262,144 |
| Max Output | 128,000 | 230,400 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | - | 49.9 |
| ai_index_agentic | - | 35.5 |
| ai_index_coding | - | 65.3 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Step 3.7 Flash costs $0.49 and GPT-5.6 Terra Pro costs $5.00, so Step 3.7 Flash is about 10.3 times cheaper for the same work.
GPT-5.6 Terra Pro reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 393 pages for Step 3.7 Flash.
Only Step 3.7 Flash offers video input.
Across the 20 tasks where they differ, Step 3.7 Flash on 20 (SQL Generation, Code Review, Code Completion and others).
GPT-5.6 Terra Pro was released in July 2026 and Step 3.7 Flash in May 2026.
Pick GPT-5.6 Terra Pro if you need long documents; pick Step 3.7 Flash if you need lower cost, 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 | OpenAI: GPT-5.6 Terra Pro | StepFun: Step 3.7 Flash |
|---|---|---|
| SQL Generation | 132 | 153 |
| Code Review | 132 | 146 |
| Code Completion | 117 | 130 |
| Code Refactoring | 136 | 144 |
| Bug Fixing | 136 | 155 |
| Unit Test Generation | 124 | 139 |
| Code Documentation | 129 | 133 |
| Regex Writing | 117 | 129 |
| CI/CD Pipelines | 120 | 131 |
| Frontend Component Design | 122 | 136 |
| Data Analysis | 124 | 150 |
| CSV / Spreadsheet Cleanup | 132 | 141 |
| ETL Scripting | 128 | 137 |
| JSON Extraction | 121 | 142 |
| Bulk Data Labeling | 117 | 133 |
| OCR / Document Parsing | 131 | 138 |
| Table Extraction from PDFs | 131 | 138 |
| Long-Document Summarization | 136 | 142 |
| Short-Form Summarization | 113 | 128 |
| Blog Post Writing | 120 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →