SpaceXAI: Grok 4.3 vs OpenAI: GPT-5.4 Nano
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.3 | OpenAI: GPT-5.4 Nano | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 58.6 | 68.1 |
| Input Price | $1.25/M | $0.20/M |
| Output Price | $2.50/M | $1.25/M |
| Context Window | 1,000,000 | 400,000 |
| Max Output | 900,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 62.0 | 63.1 |
| ai_index_agentic | 39.8 | 45.4 |
| ai_index_coding | 69.7 | 92.5 |
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 4.3 costs $1.88, so GPT-5.4 Nano is about 3.7 times cheaper for the same work.
Grok 4.3 reads up to 1,000,000 tokens at once, roughly 1,500 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 58.6.
Across the 20 tasks where they differ, GPT-5.4 Nano on 20 (SQL Generation, Code Review, Code Completion and others).
Grok 4.3 was released in April 2026 and GPT-5.4 Nano in March 2026.
Pick Grok 4.3 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 4.3 | OpenAI: GPT-5.4 Nano |
|---|---|---|
| SQL Generation | 158 | 163 |
| Code Review | 155 | 158 |
| Code Completion | 120 | 133 |
| Code Refactoring | 155 | 157 |
| Bug Fixing | 164 | 168 |
| Unit Test Generation | 144 | 148 |
| Code Documentation | 139 | 140 |
| Regex Writing | 130 | 132 |
| CI/CD Pipelines | 136 | 139 |
| Frontend Component Design | 138 | 141 |
| Data Analysis | 153 | 159 |
| CSV / Spreadsheet Cleanup | 147 | 151 |
| ETL Scripting | 145 | 148 |
| JSON Extraction | 134 | 146 |
| Bulk Data Labeling | 124 | 134 |
| OCR / Document Parsing | 141 | 144 |
| Table Extraction from PDFs | 141 | 144 |
| Long-Document Summarization | 152 | 154 |
| Short-Form Summarization | 120 | 130 |
| Blog Post Writing | 134 | 135 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →