head-to-head
OpenAI: GPT-5.6 Luna vs xAI: Grok 4.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-11.
| OpenAI: GPT-5.6 Luna | xAI: Grok 4.5 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 89.4 | 91.2 |
| Input Price | $1.00/M | $2.00/M |
| Output Price | $6.00/M | $6.00/M |
| Context Window | 1,050,000 | 500,000 |
| Max Output | 128,000 | - |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 84.5 | 88.8 |
| ai_index_agentic | 75.2 | 75.4 |
| ai_index_coding | 100.0 | 100.0 |
Who wins by task?
| Task | OpenAI: GPT-5.6 Luna | xAI: Grok 4.5 |
|---|---|---|
| SQL Generation | 171 | 171 |
| Code Review | 166 | 167 |
| Code Completion | 120 | 120 |
| Code Refactoring | 163 | 164 |
| Bug Fixing | 179 | 180 |
| Unit Test Generation | 154 | 154 |
| Code Documentation | 142 | 142 |
| Regex Writing | 135 | 135 |
| CI/CD Pipelines | 144 | 144 |
| Frontend Component Design | 146 | 146 |
| Data Analysis | 170 | 170 |
| CSV / Spreadsheet Cleanup | 153 | 154 |
| ETL Scripting | 154 | 154 |
| JSON Extraction | 139 | 139 |
| Bulk Data Labeling | 125 | 125 |
| OCR / Document Parsing | 146 | 146 |
| Table Extraction from PDFs | 146 | 146 |
| Long-Document Summarization | 159 | 159 |
| Blog Post Writing | 140 | 140 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →
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