Gemini 3.6 Flash vs GPT-4o
The fast tier from each provider, which is where most everyday API traffic actually goes.
Side by side
| Attribute | Gemini 3.6 Flash | GPT-4o |
|---|---|---|
| Input, per 1M tokens | $1.50 | $2.50 |
| Output, per 1M tokens | $7.50 | $10.00 |
| Context window | 1,000,000 | 128,000 |
| Provider | OpenAI | |
| Tokenizer | Google tokenizer | o200k_base |
| Long-context tier | none | none |
| Retires | no date announced | no date announced |
Which to choose
- Reading more than you write
- Gemini 3.6 Flash $1.50 against GPT-4o $2.50 per million input tokens — a modest gap of 1.7x.
- Writing more than you read
- Gemini 3.6 Flash prices output at 5x its input rate, GPT-4o at four times — so Gemini 3.6 Flash's lead widens as answers lengthen.
- Whole documents in one request
- GPT-4o stops at 128,000; Gemini 3.6 Flash takes 1,000,000. Past the lower ceiling only Gemini 3.6 Flash accepts the request, at any price.
- 10,000 in, 1,000 out
- $0.0225 on Gemini 3.6 Flash, $0.0350 on GPT-4o. Over 10,000 such calls that is $125.00 in Gemini 3.6 Flash's favour.
- How these counts were arrived at
- GPT-4o is counted exactly in your browser; Gemini 3.6 Flash is estimated from a characters-per-token ratio. Close, not exact.
What this page does not tell you. Which model produces better answers. That depends on your task, and this site has no benchmark data — everything above is drawn from published pricing and specifications. Compare quality by running your own prompts through both.