Gemini 3.5 Flash vs GPT-5.4
List-price comparison · Gemini 3.5 Flash details · GPT-5.4 details
For a typical workload (100,000 requests / mo), Gemini 3.5 Flash costs 40% less — $540.00/mo vs $900.00/mo.
| Gemini 3.5 Flash | GPT-5.4 | |
|---|---|---|
| Input / 1M tokens | $1.50 | $2.50 |
| Output / 1M tokens | $9.00 | $15.00 |
| Typical request (1,200 in + 400 out) | $0.0054 | $0.009 |
| Context window | 1,048,576 tokens | 1050k tokens |
| Max output | 65,536 tokens | 128k tokens |
| Tier | Flash | Flagship |
| Provider | OpenAI |
Projected monthly cost
Rows open both models in the calculator — adjust volume and token counts there.
Gemini 3.5 Flash
Fast, cheap multi-modal model with the same 1M-token context as the Pro tier — good for high-volume document Q&A and image/audio triage.
Reasoning quality trails the Pro tier on complex, multi-step tasks; best used where speed and context size matter more than depth.
GPT-5.4
Excellent general-purpose reasoning and broad world knowledge, with strong performance on coding, math, and multi-modal (image + file) inputs.
Output tokens are priced well above input tokens, so verbose responses dominate cost — tight max-token limits and prompt caching matter.
More comparisons
Vendor list rates · per-request examples assume 1,200 input + 400 output tokens.