OpenAI: GPT-5.6 Terra (batch) vs SpaceXAI: Grok 4.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| OpenAI: GPT-5.6 Terra (batch) | SpaceXAI: Grok 4.5 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 93.0 | 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 | 450,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 90.7 | 88.8 |
| ai_index_agentic | 78.2 | 75.4 |
| ai_index_coding | 100.0 | 100.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Terra (batch) costs $2.50 and Grok 4.5 costs $3.50, so GPT-5.6 Terra (batch) is about 1.4 times cheaper for the same work.
GPT-5.6 Terra (batch) reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 750 pages for Grok 4.5.
On our blended benchmark score GPT-5.6 Terra (batch) leads 93.0 to 91.2.
Across the 20 tasks where they differ, GPT-5.6 Terra (batch) scores higher on 20 (SQL Generation, Code Review, Code Completion and others).
Pick GPT-5.6 Terra (batch) if you need lower cost, long documents, benchmark performance 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 Terra (batch) | SpaceXAI: Grok 4.5 |
|---|---|---|
| SQL Generation | 172 | 171 |
| Code Review | 168 | 167 |
| Code Completion | 120 | 120 |
| Code Refactoring | 165 | 164 |
| Bug Fixing | 181 | 180 |
| Unit Test Generation | 155 | 154 |
| Code Documentation | 143 | 142 |
| Regex Writing | 136 | 135 |
| CI/CD Pipelines | 145 | 144 |
| Frontend Component Design | 147 | 146 |
| Data Analysis | 171 | 170 |
| CSV / Spreadsheet Cleanup | 154 | 154 |
| ETL Scripting | 155 | 154 |
| JSON Extraction | 139 | 139 |
| Bulk Data Labeling | 125 | 125 |
| OCR / Document Parsing | 147 | 146 |
| Table Extraction from PDFs | 147 | 146 |
| Long-Document Summarization | 160 | 159 |
| Short-Form Summarization | 123 | 123 |
| Blog Post Writing | 140 | 140 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →