head-to-head
OpenAI: GPT-5.6 Terra vs SpaceXAI: Grok 4.20
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.
| OpenAI: GPT-5.6 Terra | SpaceXAI: Grok 4.20 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 71.1 | 50.6 |
| Input Price | $2.00/M | $1.25/M |
| Output Price | $12.00/M | $2.50/M |
| Context Window | 1,050,000 | 2,000,000 |
| Max Output | 128,000 | 1,800,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 69.4 | 42.3 |
| eqbench | - | 55.8 |
Who wins by task?
| Task | OpenAI: GPT-5.6 Terra | SpaceXAI: Grok 4.20 |
|---|---|---|
| SQL Generation | 140 | 142 |
| Code Review | 145 | 146 |
| Code Completion | 118 | 121 |
| Code Refactoring | 147 | 150 |
| Bug Fixing | 149 | 150 |
| Unit Test Generation | 132 | 133 |
| Code Documentation | 135 | 139 |
| Regex Writing | 124 | 125 |
| CI/CD Pipelines | 128 | 129 |
| Frontend Component Design | 130 | 129 |
| Data Analysis | 134 | 133 |
| CSV / Spreadsheet Cleanup | 135 | 138 |
| ETL Scripting | 137 | 139 |
| JSON Extraction | 121 | 123 |
| Bulk Data Labeling | 117 | 120 |
| OCR / Document Parsing | 134 | 134 |
| Table Extraction from PDFs | 134 | 134 |
| Long-Document Summarization | 147 | 151 |
| Short-Form Summarization | 116 | 118 |
| Blog Post Writing | 128 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →
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