SpaceXAI: Grok 4.6 vs OpenAI: GPT-5.6 Sol Pro (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-12.
| SpaceXAI: Grok 4.6 | OpenAI: GPT-5.6 Sol Pro (batch) | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Input Price | $2.00/M | $2.00/M |
| Output Price | $6.00/M | $10.00/M |
| Context Window | 500,000 | 1,050,000 |
| Max Output | 450,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok 4.6 costs $3.50 and GPT-5.6 Sol Pro (batch) costs $4.50, so Grok 4.6 is about 1.3 times cheaper for the same work.
GPT-5.6 Sol Pro (batch) reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 750 pages for Grok 4.6.
Across the 10 tasks where they differ, Grok 4.6 scores higher on 10 (SQL Generation, Code Completion, Code Documentation and others).
Grok 4.6 was released in August 2026 and GPT-5.6 Sol Pro (batch) in July 2026.
Pick Grok 4.6 if you need lower cost or the stronger all-round task scores; pick GPT-5.6 Sol Pro (batch) if you need 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 Sol Pro (batch) |
|---|---|---|
| SQL Generation | 133 | 132 |
| Code Completion | 118 | 117 |
| Code Documentation | 130 | 129 |
| Regex Writing | 118 | 117 |
| CSV / Spreadsheet Cleanup | 133 | 132 |
| JSON Extraction | 122 | 121 |
| Bulk Data Labeling | 119 | 118 |
| Long-Document Summarization | 137 | 136 |
| Short-Form Summarization | 114 | 113 |
| Blog Post Writing | 121 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →