Google: Gemini 3.7 Flash vs OpenAI: GPT-5.6 Luna (batch)
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-28.
| Google: Gemini 3.7 Flash | OpenAI: GPT-5.6 Luna (batch) | |
|---|---|---|
| Vendor | openai | |
| Quality Score | 100 | 100 |
| Benchmark Score | 65.5 | 62.3 |
| Input Price | $0.75/M | $0.10/M |
| Output Price | $3.75/M | $0.60/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 | 64.4 | 61.6 |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GPT-5.6 Luna (batch) costs $0.25 and Gemini 3.7 Flash costs $1.69, so GPT-5.6 Luna (batch) is about 6.8 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 3.7 Flash offers audio input and video input.
On our blended benchmark score Gemini 3.7 Flash leads 65.5 to 62.3.
Across the 18 tasks where they differ, Gemini 3.7 Flash scores higher on 11 (Code Review, Code Refactoring, Bug Fixing and others), GPT-5.6 Luna (batch) on 7 (Code Completion, Code Documentation, Regex Writing and others).
Gemini 3.7 Flash was released in August 2026 and GPT-5.6 Luna (batch) in July 2026.
Pick Gemini 3.7 Flash if you need audio input, video input or benchmark performance; pick GPT-5.6 Luna (batch) if you need lower cost.
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 3.7 Flash | OpenAI: GPT-5.6 Luna (batch) |
|---|---|---|
| Code Review | 144 | 143 |
| Code Completion | 132 | 133 |
| Code Refactoring | 146 | 145 |
| Bug Fixing | 148 | 147 |
| Unit Test Generation | 131 | 131 |
| Code Documentation | 136 | 137 |
| Regex Writing | 125 | 126 |
| CI/CD Pipelines | 127 | 127 |
| Frontend Component Design | 129 | 129 |
| Data Analysis | 133 | 133 |
| CSV / Spreadsheet Cleanup | 136 | 136 |
| ETL Scripting | 137 | 136 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 128 | 129 |
| OCR / Document Parsing | 134 | 134 |
| Table Extraction from PDFs | 134 | 134 |
| Long-Document Summarization | 147 | 147 |
| Short-Form Summarization | 126 | 126 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →