OpenAI GPT-4o vs. Gemini 1.5 Flash — Interactive Cost & Performance Calculator
Compare OpenAI GPT-4o vs Gemini 1.5 Flash side-by-side. Use our interactive calculator to estimate exact monthly costs, savings, and performance trade-offs at your scale.
OpenAI GPT-4o
Best for: Multimodal enterprise reasoning & function calling
Gemini 1.5 Flash
Best for: Ultra-low-cost long-context summarization at scale
Side-by-Side Technical & Commercial Breakdown: OpenAI GPT-4o vs. Gemini 1.5 Flash
| Dimension | OpenAI GPT-4o | Gemini 1.5 Flash |
|---|---|---|
| Provider | OpenAI | Google Cloud Vertex |
| Input Price (per 1M tokens) | $2.500 | $0.075 |
| Output Price (per 1M tokens) | $10.00 | $0.30 |
| Context Window | 128K tokens | 1,000K (1M) tokens |
| Throughput Speed | 85 tok/s | 165 tok/s |
| License / Weights | Proprietary API | Proprietary API |
| Best Use Case | Multimodal enterprise reasoning & function calling | Ultra-low-cost long-context summarization at scale |
Frequently Asked Questions
Which is more cost-effective in 2026: OpenAI GPT-4o or Gemini 1.5 Flash?
It depends on your workload volume. Use the interactive sliders above to model your exact monthly scale. OpenAI GPT-4o (Multimodal enterprise reasoning & function calling) and Gemini 1.5 Flash (Ultra-low-cost long-context summarization at scale) have different unit economics that cross over as volume scales.
When should an engineering team choose OpenAI GPT-4o over Gemini 1.5 Flash?
Choose OpenAI GPT-4o when your primary priority is: Multimodal enterprise reasoning & function calling. Choose Gemini 1.5 Flash when you prioritize: Ultra-low-cost long-context summarization at scale.