SpaceXAI: Grok Build 0.1 vs Google: Gemini 3.1 Pro Preview Custom Tools
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok Build 0.1 | Google: Gemini 3.1 Pro Preview Custom Tools | |
|---|---|---|
| Vendor | x-ai | |
| Quality Score | 100 | 100 |
| Input Price | $1.00/M | $2.00/M |
| Output Price | $2.00/M | $12.00/M |
| Context Window | 256,000 | 1,048,576 |
| Max Output | 230,400 | 65,536 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | ✓ |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok Build 0.1 costs $1.50 and Gemini 3.1 Pro Preview Custom Tools costs $5.00, so Grok Build 0.1 is about 3.3 times cheaper for the same work.
Gemini 3.1 Pro Preview Custom Tools reads up to 1,048,576 tokens at once, roughly 1,573 pages of text, against about 384 pages for Grok Build 0.1.
Only Gemini 3.1 Pro Preview Custom Tools offers audio input and video input.
Across the 18 tasks where they differ, Grok Build 0.1 scores higher on 4 (Regex Writing, JSON Extraction, Bulk Data Labeling and others), Gemini 3.1 Pro Preview Custom Tools on 14 (SQL Generation, Code Review, Code Completion and others).
Grok Build 0.1 was released in May 2026 and Gemini 3.1 Pro Preview Custom Tools in February 2026.
Pick Grok Build 0.1 if you need lower cost; pick Gemini 3.1 Pro Preview Custom Tools if you need long documents, audio input, 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 | SpaceXAI: Grok Build 0.1 | Google: Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| SQL Generation | 130 | 132 |
| Code Review | 126 | 132 |
| Code Completion | 116 | 117 |
| Code Refactoring | 127 | 136 |
| Bug Fixing | 130 | 136 |
| Unit Test Generation | 121 | 124 |
| Code Documentation | 125 | 129 |
| Regex Writing | 119 | 117 |
| CI/CD Pipelines | 117 | 120 |
| CSV / Spreadsheet Cleanup | 127 | 132 |
| ETL Scripting | 122 | 128 |
| JSON Extraction | 123 | 121 |
| Bulk Data Labeling | 121 | 117 |
| OCR / Document Parsing | 128 | 131 |
| Table Extraction from PDFs | 128 | 131 |
| Long-Document Summarization | 129 | 136 |
| Short-Form Summarization | 115 | 113 |
| Blog Post Writing | 118 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →