Comparison
Gemini 3.5 Flash vs GPT-4o
Per input token, Gemini 3.5 Flash runs 40% cheaper than GPT-4o. Output pricing favors Gemini 3.5 Flash, 10% less per token than GPT-4o. Gemini 3.5 Flash has the larger context window than GPT-4o.
| Field | Gemini 3.5 Flash | GPT-4o Legacy |
|---|---|---|
| Provider | OpenAI | |
| Context window | 1M | 128K |
| Max output | 65.5K | — |
| Input / 1M | $1.5040% cheaper | $2.50 |
| Output / 1M | $9.0010% cheaper | $10.00 |
| Cached input / 1M | $0.1588% cheaper | $1.25 |
| Batch discount | 50% | — |
| Release date | — | — |
Worked cost examples
Estimated monthly cost on three common usage shapes
| Workload | Gemini 3.5 Flash | GPT-4o |
|---|---|---|
Chatbot 800 input / 200 output tokens per request, 100,000 requests/month | $300.00cheaper | $400.00 |
RAG pipeline 6,000 input / 700 output tokens per request, 30,000 requests/month | $459.00cheaper | $660.00 |
Batch summarization 20,000 input / 1,500 output tokens per request, 5,000 requests/month | $217.50cheaper | $325.00 |
Gemini 3.5 Flash vs GPT-4o FAQ
- Is Gemini 3.5 Flash cheaper than GPT-4o?
- Gemini 3.5 Flash costs $1.50 per 1M input tokens versus $2.50 for GPT-4o — Gemini 3.5 Flash is 40% cheaper per input token.
- Which is cheaper for output tokens, Gemini 3.5 Flash or GPT-4o?
- Gemini 3.5 Flash charges $9.00 per 1M output tokens; GPT-4o charges $10.00 per 1M output tokens.
- Which has the larger context window, Gemini 3.5 Flash or GPT-4o?
- Gemini 3.5 Flash does, with a 1,048,576-token context window.
- Do Gemini 3.5 Flash and GPT-4o offer cache pricing?
- Gemini 3.5 Flash discounts cached input to $0.15 per 1M tokens. GPT-4o discounts cached input to $1.25 per 1M tokens.
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