OpenAI: GPT-5.6 Sol vs SpaceXAI: Grok 4.5
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-02.
| OpenAI: GPT-5.6 Sol | SpaceXAI: Grok 4.5 | |
|---|---|---|
| Vendor | openai | x-ai |
| Quality Score | 100 | 100 |
| Benchmark Score | 80.2 | 65.0 |
| Input Price | $2.00/M | $2.00/M |
| Output Price | $10.00/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 | 77.5 | 64.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok 4.5 costs $3.50 and GPT-5.6 Sol costs $4.50, so Grok 4.5 is about 1.3 times cheaper for the same work.
GPT-5.6 Sol 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 Sol leads 80.2 to 65.0.
Across the 20 tasks where they differ, GPT-5.6 Sol scores higher on 16 (SQL Generation, Code Review, Code Refactoring and others), Grok 4.5 on 4 (Code Completion, JSON Extraction, Bulk Data Labeling and others).
Pick GPT-5.6 Sol if you need long documents, benchmark performance or the stronger all-round task scores; pick Grok 4.5 if you need lower cost.
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 Sol | SpaceXAI: Grok 4.5 |
|---|---|---|
| SQL Generation | 142 | 140 |
| Code Review | 146 | 144 |
| Code Completion | 119 | 119 |
| Code Refactoring | 148 | 146 |
| Bug Fixing | 150 | 148 |
| Unit Test Generation | 133 | 131 |
| Code Documentation | 136 | 136 |
| Regex Writing | 125 | 124 |
| CI/CD Pipelines | 129 | 127 |
| Frontend Component Design | 131 | 129 |
| Data Analysis | 135 | 133 |
| CSV / Spreadsheet Cleanup | 135 | 135 |
| ETL Scripting | 138 | 137 |
| JSON Extraction | 121 | 122 |
| Bulk Data Labeling | 118 | 119 |
| OCR / Document Parsing | 134 | 134 |
| Table Extraction from PDFs | 134 | 134 |
| Long-Document Summarization | 149 | 147 |
| Short-Form Summarization | 117 | 117 |
| Blog Post Writing | 130 | 128 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →