Gemini 3.5 Flash vs GPT-5.5
google/gemini-3.5-flash · openai/gpt-5.5
As of October 26, 2026, Gemini 3.5 Flash is the cheaper API on UberLLM: $0.3000 per million input tokens and $1.80 per million output, versus $1.10 / $6.60 for GPT-5.5 — about 73% less on a blended 3:1 token mix. Both are reached through one OpenAI-compatible key and routed to the cheapest healthy seller, with no UberLLM fee added, so the price you see is the price you pay. Choose Gemini 3.5 Flash to cut cost; choose GPT-5.5 when its capabilities fit your task better.
Gemini 3.5 Flash vs GPT-5.5, side by side
| Spec | Gemini 3.5 Flash | GPT-5.5 |
|---|---|---|
| Price · input / 1M | $0.3000 | $1.10 |
| Price · output / 1M | $1.80 | $6.60 |
| Context length | 1,048,576 | 1,000,000 |
| Max output tokens | 65,536 | 128,000 |
| Input modalities | text | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Cheapest seller | UberLLM | UberLLM |
| % off list | 80% off | 78% off |
Live prices via UberLLM, routed to the cheapest healthy seller. The price shown has no UberLLM fee added. Updated October 26, 2026.
Gemini 3.5 Flash vs GPT-5.5 — FAQ
Is Gemini 3.5 Flash or GPT-5.5 cheaper?
Gemini 3.5 Flash is cheaper on a blended token mix, by about 73%. UberLLM routes every request to the cheapest healthy seller and bills the price shown, with no fee added.
What's the price difference between Gemini 3.5 Flash and GPT-5.5?
Gemini 3.5 Flash: $0.3000 in / $1.80 out per 1M tokens. GPT-5.5: $1.10 in / $6.60 out per 1M tokens. That's roughly a 73% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Gemini 3.5 Flash and GPT-5.5 with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.