SpaceXAI: Grok Build 0.1 vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| SpaceXAI: Grok Build 0.1 | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | x-ai | openai |
| Quality Score | 100 | 100 |
| Benchmark Score | - | 73.4 |
| Input Price | $1.00/M | $1.75/M |
| Output Price | $2.00/M | $14.00/M |
| Context Window | 256,000 | 400,000 |
| Max Output | 230,400 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | - | 73.0 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Grok Build 0.1 costs $1.50 and GPT-5.3-Codex costs $5.25, so Grok Build 0.1 is about 3.5 times cheaper for the same work.
GPT-5.3-Codex reads up to 400,000 tokens at once, roughly 600 pages of text, against about 384 pages for Grok Build 0.1.
Across the 20 tasks where they differ, Grok Build 0.1 scores higher on 2 (JSON Extraction, Bulk Data Labeling), GPT-5.3-Codex on 18 (SQL Generation, Code Review, Code Completion and others).
Grok Build 0.1 was released in May 2026 and GPT-5.3-Codex in February 2026.
Pick Grok Build 0.1 if you need lower cost; pick GPT-5.3-Codex if you need long documents 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 Build 0.1 | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 130 | 141 |
| Code Review | 126 | 145 |
| Code Completion | 116 | 118 |
| Code Refactoring | 127 | 147 |
| Bug Fixing | 130 | 149 |
| Unit Test Generation | 121 | 132 |
| Code Documentation | 125 | 135 |
| Regex Writing | 119 | 124 |
| CI/CD Pipelines | 117 | 128 |
| Frontend Component Design | 122 | 130 |
| Data Analysis | 124 | 134 |
| CSV / Spreadsheet Cleanup | 127 | 135 |
| ETL Scripting | 122 | 138 |
| JSON Extraction | 123 | 120 |
| Bulk Data Labeling | 121 | 117 |
| OCR / Document Parsing | 128 | 134 |
| Table Extraction from PDFs | 128 | 134 |
| Long-Document Summarization | 129 | 148 |
| Short-Form Summarization | 115 | 116 |
| Blog Post Writing | 118 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →