SpaceXAI: Grok 4.3 vs OpenAI: GPT-5.4
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok 4.3 | OpenAI: GPT-5.4 | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | 58.6 | 89.6 |
| Input Price | $1.25/M | $2.50/M |
| Output Price | $2.50/M | $15.00/M |
| Context Window | 1,000,000 | 1,050,000 |
| Max Output | 900,000 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 62.0 | 84.8 |
| ai_index_agentic | 39.8 | 67.8 |
| ai_index_coding | 69.7 | 100.0 |
| eqbench | - | 75.6 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok 4.3 costs $1.88 and GPT-5.4 costs $6.25, so Grok 4.3 is about 3.3 times cheaper for the same work.
Both take in a similar amount of text: 1,000,000 and 1,050,000 tokens, about 1,500 and 1,575 pages.
On our blended benchmark score GPT-5.4 leads 89.6 to 58.6.
Across the 19 tasks where they differ, Grok 4.3 scores higher on 1 (Bulk Data Labeling), GPT-5.4 on 18 (SQL Generation, Code Review, Code Refactoring and others).
Grok 4.3 was released in April 2026 and GPT-5.4 in March 2026.
Pick Grok 4.3 if you need lower cost; pick GPT-5.4 if you need 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 |
|---|---|---|
| SQL Generation | 158 | 174 |
| Code Review | 155 | 175 |
| Code Refactoring | 155 | 173 |
| Bug Fixing | 164 | 187 |
| Unit Test Generation | 144 | 158 |
| Code Documentation | 139 | 146 |
| Regex Writing | 130 | 136 |
| CI/CD Pipelines | 136 | 149 |
| Frontend Component Design | 138 | 148 |
| Data Analysis | 153 | 173 |
| CSV / Spreadsheet Cleanup | 147 | 157 |
| ETL Scripting | 145 | 161 |
| JSON Extraction | 134 | 137 |
| Bulk Data Labeling | 124 | 122 |
| OCR / Document Parsing | 141 | 148 |
| Table Extraction from PDFs | 141 | 148 |
| Long-Document Summarization | 152 | 167 |
| Short-Form Summarization | 120 | 122 |
| Blog Post Writing | 134 | 143 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →