Google: Gemma 4 31B vs OpenAI: GPT-5.3-Codex
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Google: Gemma 4 31B | OpenAI: GPT-5.3-Codex | |
|---|---|---|
| Vendor | openai | |
| Quality Score | 100 | 100 |
| Benchmark Score | 53.7 | 73.4 |
| Input Price | $0.20/M | $1.75/M |
| Output Price | $0.40/M | $14.00/M |
| Context Window | 262,144 | 400,000 |
| Max Output | 16,384 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 48.4 | 73.0 |
| ai_index_agentic | 23.8 | - |
| ai_index_coding | 71.7 | - |
| eqbench | 57.5 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Gemma 4 31B costs $0.30 and GPT-5.3-Codex costs $5.25, so Gemma 4 31B is about 17.5 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 393 pages for Gemma 4 31B.
Only Gemma 4 31B offers video input.
On our blended benchmark score GPT-5.3-Codex leads 73.4 to 53.7.
Across the 20 tasks where they differ, Gemma 4 31B scores higher on 20 (SQL Generation, Code Review, Code Completion and others).
Gemma 4 31B was released in April 2026 and GPT-5.3-Codex in February 2026.
Pick Gemma 4 31B if you need lower cost, video input or the stronger all-round task scores; pick GPT-5.3-Codex if you need long documents or benchmark performance.
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 | Google: Gemma 4 31B | OpenAI: GPT-5.3-Codex |
|---|---|---|
| SQL Generation | 156 | 141 |
| Code Review | 152 | 145 |
| Code Completion | 131 | 118 |
| Code Refactoring | 151 | 147 |
| Bug Fixing | 160 | 149 |
| Unit Test Generation | 143 | 132 |
| Code Documentation | 137 | 135 |
| Regex Writing | 131 | 124 |
| CI/CD Pipelines | 135 | 128 |
| Frontend Component Design | 138 | 130 |
| Data Analysis | 152 | 134 |
| CSV / Spreadsheet Cleanup | 145 | 135 |
| ETL Scripting | 143 | 138 |
| JSON Extraction | 143 | 120 |
| Bulk Data Labeling | 133 | 117 |
| OCR / Document Parsing | 140 | 134 |
| Table Extraction from PDFs | 140 | 134 |
| Long-Document Summarization | 149 | 148 |
| Short-Form Summarization | 129 | 116 |
| Blog Post Writing | 133 | 129 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →