OpenAI: GPT-6.1 Sol Pro vs Nex AGI: Nex-N2.5-Pro
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-30.
| OpenAI: GPT-6.1 Sol Pro | Nex AGI: Nex-N2.5-Pro | |
|---|---|---|
| Vendor | openai | nex-agi |
| Quality Score | 100 | 100 |
| Input Price | $2.00/M | $0.07/M |
| Output Price | $10.00/M | $0.25/M |
| Context Window | 1,050,000 | 262,144 |
| Max Output | 128,000 | 235,929 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Nex-N2.5-Pro costs $0.14 and GPT-6.1 Sol Pro costs $4.50, so Nex-N2.5-Pro is about 32.7 times cheaper for the same work.
GPT-6.1 Sol Pro reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 393 pages for Nex-N2.5-Pro.
Across the 18 tasks where they differ, GPT-6.1 Sol Pro scores higher on 13 (SQL Generation, Code Review, Code Refactoring and others), Nex-N2.5-Pro on 5 (Code Completion, Regex Writing, JSON Extraction and others).
Pick GPT-6.1 Sol Pro if you need long documents or the stronger all-round task scores; pick Nex-N2.5-Pro if you need lower cost.
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-6.1 Sol Pro | Nex AGI: Nex-N2.5-Pro |
|---|---|---|
| SQL Generation | 132 | 131 |
| Code Review | 132 | 126 |
| Code Completion | 117 | 129 |
| Code Refactoring | 136 | 127 |
| Bug Fixing | 136 | 130 |
| Unit Test Generation | 124 | 121 |
| Code Documentation | 129 | 126 |
| Regex Writing | 117 | 119 |
| CI/CD Pipelines | 120 | 117 |
| CSV / Spreadsheet Cleanup | 132 | 128 |
| ETL Scripting | 128 | 122 |
| JSON Extraction | 121 | 131 |
| Bulk Data Labeling | 118 | 129 |
| OCR / Document Parsing | 131 | 128 |
| Table Extraction from PDFs | 131 | 128 |
| Long-Document Summarization | 136 | 129 |
| Short-Form Summarization | 113 | 123 |
| Blog Post Writing | 120 | 119 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →