head-to-head
Google: Gemini 3.5 Flash vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.
| Google: Gemini 3.5 Flash | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | openai | |
| Quality Score | 100 | 100 |
| Benchmark Score | 53.5 | 53.3 |
| Input Price | $1.50/M | $1.75/M |
| Output Price | $9.00/M | $14.00/M |
| Context Window | 1,048,576 | 400,000 |
| Max Output | 65,536 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | ✓ | - |
| Benchmark Scores | ||
| ai_index | 53.8 | 53.6 |
Who wins by task?
| Task | Google: Gemini 3.5 Flash | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 139 | 138 |
| Code Completion | 119 | 117 |
| Unit Test Generation | 130 | 130 |
| Code Documentation | 134 | 133 |
| Regex Writing | 123 | 122 |
| CI/CD Pipelines | 126 | 126 |
| Frontend Component Design | 128 | 128 |
| Data Analysis | 132 | 132 |
| CSV / Spreadsheet Cleanup | 135 | 134 |
| JSON Extraction | 121 | 120 |
| Bulk Data Labeling | 118 | 117 |
| Long-Document Summarization | 145 | 145 |
| Short-Form Summarization | 116 | 115 |
| Blog Post Writing | 127 | 126 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →
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