SpaceXAI: Grok 4.6 vs OpenAI: GPT-5.6 Terra (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-27.
| SpaceXAI: Grok 4.6 | OpenAI: GPT-5.6 Terra (batch) | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 75.3 | 71.1 |
| Input Price | $2.00/M | $1.00/M |
| Output Price | $6.00/M | $6.00/M |
| Context Window | 500,000 | 1,050,000 |
| Max Output | 450,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 73.1 | 69.4 |
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 4.6 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 4.6.
On our blended benchmark score Grok 4.6 leads 75.3 to 71.1.
Across the 18 tasks where they differ, Grok 4.6 scores higher on 15 (SQL Generation, Code Review, Code Refactoring and others), GPT-5.6 Terra (batch) on 3 (Code Completion, JSON Extraction, Bulk Data Labeling).
Grok 4.6 was released in August 2026 and GPT-5.6 Terra (batch) in July 2026.
Pick Grok 4.6 if you need benchmark performance or the stronger all-round task scores; pick GPT-5.6 Terra (batch) if you need lower cost or long documents.
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 | SpaceXAI: Grok 4.6 | OpenAI: GPT-5.6 Terra (batch) |
|---|---|---|
| SQL Generation | 142 | 141 |
| Code Review | 145 | 145 |
| Code Completion | 119 | 120 |
| Code Refactoring | 147 | 147 |
| Bug Fixing | 149 | 149 |
| Unit Test Generation | 132 | 132 |
| Code Documentation | 137 | 136 |
| Regex Writing | 125 | 125 |
| CI/CD Pipelines | 128 | 128 |
| Frontend Component Design | 130 | 130 |
| Data Analysis | 135 | 134 |
| ETL Scripting | 138 | 137 |
| JSON Extraction | 122 | 122 |
| Bulk Data Labeling | 119 | 119 |
| OCR / Document Parsing | 134 | 134 |
| Table Extraction from PDFs | 134 | 134 |
| Long-Document Summarization | 148 | 148 |
| Blog Post Writing | 130 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →