head-to-head
OpenAI: GPT-5.6 Luna (batch) vs SpaceXAI: Grok 4.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.
| OpenAI: GPT-5.6 Luna (batch) | SpaceXAI: Grok 4.5 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 62.3 | 65.0 |
| Input Price | $0.10/M | $2.00/M |
| Output Price | $0.60/M | $6.00/M |
| Context Window | 1,050,000 | 500,000 |
| Max Output | 128,000 | 450,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 61.6 | 64.0 |
Who wins by task?
| Task | OpenAI: GPT-5.6 Luna (batch) | SpaceXAI: Grok 4.5 |
|---|---|---|
| SQL Generation | 141 | 140 |
| Code Review | 143 | 144 |
| Code Completion | 133 | 119 |
| Code Refactoring | 145 | 146 |
| Bug Fixing | 147 | 148 |
| Unit Test Generation | 131 | 131 |
| Code Documentation | 137 | 136 |
| Regex Writing | 126 | 124 |
| CI/CD Pipelines | 127 | 127 |
| Frontend Component Design | 129 | 129 |
| Data Analysis | 133 | 133 |
| CSV / Spreadsheet Cleanup | 136 | 135 |
| ETL Scripting | 136 | 137 |
| JSON Extraction | 131 | 122 |
| Bulk Data Labeling | 129 | 119 |
| OCR / Document Parsing | 134 | 134 |
| Table Extraction from PDFs | 134 | 134 |
| Long-Document Summarization | 147 | 147 |
| Short-Form Summarization | 126 | 117 |
| Blog Post Writing | 129 | 128 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →
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