Google: Gemini 3.5 Flash vs OpenAI: GPT-5.4
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| Google: Gemini 3.5 Flash | OpenAI: GPT-5.4 | |
|---|---|---|
| Vendor | openai | |
| Quality Score | 100 | 100 |
| Benchmark Score | 84.2 | 89.6 |
| Input Price | $1.50/M | $2.50/M |
| Output Price | $9.00/M | $15.00/M |
| Context Window | 1,048,576 | 1,050,000 |
| Max Output | 65,536 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | ✓ | - |
| Benchmark Scores | ||
| ai_index | 82.8 | 84.8 |
| ai_index_agentic | 61.8 | 67.8 |
| ai_index_coding | 100.0 | 100.0 |
| eqbench | - | 75.6 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Gemini 3.5 Flash costs $3.75 and GPT-5.4 costs $6.25, so Gemini 3.5 Flash is about 1.7 times cheaper for the same work.
Both take in a similar amount of text: 1,048,576 and 1,050,000 tokens, about 1,573 and 1,575 pages.
Only Gemini 3.5 Flash offers audio input and video input.
On our blended benchmark score GPT-5.4 leads 89.6 to 84.2.
Across the 20 tasks where they differ, Gemini 3.5 Flash scores higher on 2 (JSON Extraction, Bulk Data Labeling), GPT-5.4 on 18 (SQL Generation, Code Review, Code Completion and others).
Gemini 3.5 Flash was released in May 2026 and GPT-5.4 in March 2026.
Pick Gemini 3.5 Flash if you need lower cost, audio input or video input; 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 | Google: Gemini 3.5 Flash | OpenAI: GPT-5.4 |
|---|---|---|
| SQL Generation | 168 | 174 |
| Code Review | 164 | 175 |
| Code Completion | 119 | 120 |
| Code Refactoring | 162 | 173 |
| Bug Fixing | 176 | 187 |
| Unit Test Generation | 152 | 158 |
| Code Documentation | 141 | 146 |
| Regex Writing | 133 | 136 |
| CI/CD Pipelines | 143 | 149 |
| Frontend Component Design | 145 | 148 |
| Data Analysis | 167 | 173 |
| CSV / Spreadsheet Cleanup | 153 | 157 |
| ETL Scripting | 152 | 161 |
| JSON Extraction | 138 | 137 |
| Bulk Data Labeling | 124 | 122 |
| OCR / Document Parsing | 146 | 148 |
| Table Extraction from PDFs | 146 | 148 |
| Long-Document Summarization | 157 | 167 |
| Short-Form Summarization | 121 | 122 |
| Blog Post Writing | 138 | 143 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →