SpaceXAI: Grok 4.20 vs OpenAI: GPT-5.4 Nano
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.20 | OpenAI: GPT-5.4 Nano | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 56.5 | 68.1 |
| Input Price | $1.25/M | $0.20/M |
| Output Price | $2.50/M | $1.25/M |
| Context Window | 2,000,000 | 400,000 |
| Max Output | 1,800,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 61.0 | 63.1 |
| ai_index_agentic | - | 45.4 |
| ai_index_coding | - | 92.5 |
| eqbench | 45.7 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.4 Nano costs $0.51 and Grok 4.20 costs $1.88, so GPT-5.4 Nano is about 3.7 times cheaper for the same work.
Grok 4.20 reads up to 2,000,000 tokens at once, roughly 3,000 pages of text, against about 600 pages for GPT-5.4 Nano.
On our blended benchmark score GPT-5.4 Nano leads 68.1 to 56.5.
Across the 20 tasks where they differ, GPT-5.4 Nano on 20 (SQL Generation, Code Review, Code Completion and others).
Pick Grok 4.20 if you need long documents; pick GPT-5.4 Nano if you need lower cost, 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 | SpaceXAI: Grok 4.20 | OpenAI: GPT-5.4 Nano |
|---|---|---|
| SQL Generation | 144 | 163 |
| Code Review | 149 | 158 |
| Code Completion | 121 | 133 |
| Code Refactoring | 151 | 157 |
| Bug Fixing | 153 | 168 |
| Unit Test Generation | 134 | 148 |
| Code Documentation | 140 | 140 |
| Regex Writing | 127 | 132 |
| CI/CD Pipelines | 130 | 139 |
| Frontend Component Design | 131 | 141 |
| Data Analysis | 135 | 159 |
| CSV / Spreadsheet Cleanup | 138 | 151 |
| ETL Scripting | 141 | 148 |
| JSON Extraction | 123 | 146 |
| Bulk Data Labeling | 120 | 134 |
| OCR / Document Parsing | 135 | 144 |
| Table Extraction from PDFs | 135 | 144 |
| Long-Document Summarization | 153 | 154 |
| Short-Form Summarization | 119 | 130 |
| Blog Post Writing | 132 | 135 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →