OpenAI: GPT-5.6 Luna Pro vs SpaceXAI: Grok Build 0.1
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.6 Luna Pro | SpaceXAI: Grok Build 0.1 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Input Price | $0.20/M | $1.00/M |
| Output Price | $1.20/M | $2.00/M |
| Context Window | 1,050,000 | 256,000 |
| Max Output | 128,000 | 230,400 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Luna Pro costs $0.50 and Grok Build 0.1 costs $1.50, so GPT-5.6 Luna Pro is about 3.0 times cheaper for the same work.
GPT-5.6 Luna Pro reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 384 pages for Grok Build 0.1.
Across the 18 tasks where they differ, GPT-5.6 Luna Pro scores higher on 18 (SQL Generation, Code Review, Code Completion and others).
GPT-5.6 Luna Pro was released in July 2026 and Grok Build 0.1 in May 2026.
Pick GPT-5.6 Luna Pro if you need lower cost, long documents 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 Luna Pro | SpaceXAI: Grok Build 0.1 |
|---|---|---|
| SQL Generation | 133 | 130 |
| Code Review | 132 | 126 |
| Code Completion | 131 | 116 |
| Code Refactoring | 136 | 127 |
| Bug Fixing | 136 | 130 |
| Unit Test Generation | 124 | 121 |
| Code Documentation | 131 | 125 |
| Regex Writing | 119 | 119 |
| CI/CD Pipelines | 120 | 117 |
| CSV / Spreadsheet Cleanup | 133 | 127 |
| ETL Scripting | 128 | 122 |
| JSON Extraction | 131 | 123 |
| Bulk Data Labeling | 129 | 121 |
| OCR / Document Parsing | 131 | 128 |
| Table Extraction from PDFs | 131 | 128 |
| Long-Document Summarization | 137 | 129 |
| Short-Form Summarization | 123 | 115 |
| Blog Post Writing | 121 | 118 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →