Gemini 3.1 Pro Preview vs Gemini 3.8 Flash
Gemini 3.8 Flash costs less on both: $0.45 in and $2.25 out per million tokens, against $1.20 in and $7.20 out for Gemini 3.1 Pro Preview. Both on one key at UplinkSwitch, each next to its developer's list price.
Prices · per million tokens, USD
| Tokens | Gemini 3.1 Pro Previewgemini-3.1-pro-preview | Gemini 3.8 Flashgemini-3.8-flash |
|---|---|---|
| Input | $1.20Google lists $2.00 · 40% under | $0.45Google lists $0.75 · 40% under |
| Cached input | $0.12Google lists $0.20 · 40% under | $0.045Google lists $0.075 · 40% under |
| Output | $7.20Google lists $12.00 · 40% under | $2.25Google lists $3.75 · 40% under |
| Formats | Gemini SDK, OpenAI SDK | OpenAI SDK, Gemini SDK |
| Developer |
List price: each developer's published rate, read October 2026. A model with no cached rate bills cached tokens at its input rate. Live from GET https://api.uplinkswitch.com/v1/catalog.
Same key, same URL
One base URL and one key serve both models. The request below calls Gemini 3.1 Pro Preview; put gemini-3.8-flash in the model field to call Gemini 3.8 Flash instead.
shell
curl https://api.uplinkswitch.com/v1/chat/completions \
-H "authorization: Bearer sk-uplink-live-..." \
-H "content-type: application/json" \
-d '{"model":"gemini-3.1-pro-preview","messages":[{"role":"user","content":"Hello"}]}'Model pages: Gemini 3.1 Pro Preview, Gemini 3.8 Flash. Pricing by family: Gemini. More comparisons: Claude Opus 5.5 vs Gemini 3.1 Pro Preview, GPT-6.1 Sol vs Gemini 3.1 Pro Preview, Gemini 3.1 Pro Preview vs Gemini 2.5 Pro, Claude Sonnet 5.5 vs Gemini 3.8 Flash.
Questions
- Which costs less, Gemini 3.1 Pro Preview or Gemini 3.8 Flash?
- Gemini 3.8 Flash costs less on both: $0.45 in and $2.25 out per million tokens, against $1.20 in and $7.20 out for Gemini 3.1 Pro Preview.
- Can I switch between them by changing the model id?
- Yes. Both answer in the Gemini SDK and OpenAI SDK format at the same base URL with the same key. Change the model id from gemini-3.1-pro-preview to gemini-3.8-flash and nothing else.
- Is there a subscription?
- No. Prepaid credit from $10, with no subscription or monthly fee. Each top-up locks your prices for 30 days.