Gemini 3.8 Flash vs Gemini 3.5 Flash
Gemini 3.8 Flash costs less on both: $0.45 in and $2.25 out per million tokens, against $0.90 in and $5.40 out for Gemini 3.5 Flash. Both on one key at UplinkSwitch, each next to its developer's list price.
Prices · per million tokens, USD
| Tokens | Gemini 3.8 Flashgemini-3.8-flash | Gemini 3.5 Flashgemini-3.5-flash |
|---|---|---|
| Input | $0.45Google lists $0.75 · 40% under | $0.90Google lists $1.50 · 40% under |
| Cached input | $0.045Google lists $0.075 · 40% under | $0.09Google lists $0.15 · 40% under |
| Output | $2.25Google lists $3.75 · 40% under | $5.40Google lists $9.00 · 40% under |
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 65,536 tokens | 65,536 tokens |
| Input | text, image, audio, video | text, image, audio, video |
| Released | 2026-09-02 | 2026-05-19 |
| Formats | OpenAI SDK, Gemini SDK | Gemini SDK, OpenAI 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.
What the same work costs · USD, here and at list
| Work | Gemini 3.8 Flash | Gemini 3.5 Flash |
|---|---|---|
| 1,000 chat requests | $2.03list $3.38 | $4.50list $7.50 |
| 100 long documents | $2.70list $4.50 | $5.58list $9.30 |
| A month of both, daily | $141.75list $236.25 | $302.40list $504.00 |
A chat request is 2,000 input and 500 output tokens; a long document is 50,000 in and 2,000 out; the month is 1,000 chats and 100 documents a day for 30 days, uncached. Over that month Gemini 3.8 Flash costs $160.65 less here.
Same key, same URL
One base URL and one key serve both models. The request below calls Gemini 3.8 Flash; put gemini-3.5-flash in the model field to call Gemini 3.5 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-3.8-flash","messages":[{"role":"user","content":"Hello"}]}'Model pages: Gemini 3.8 Flash, Gemini 3.5 Flash. Pricing by family: Gemini. More comparisons: Claude Sonnet 5.5 vs Gemini 3.8 Flash, Gemini 3.8 Flash vs GPT-6.1 Sol, Gemini 3.8 Flash vs GPT-6 Sol, Claude Haiku 5.5 vs Gemini 3.8 Flash.
Questions
- Which costs less, Gemini 3.8 Flash or Gemini 3.5 Flash?
- Gemini 3.8 Flash costs less on both: $0.45 in and $2.25 out per million tokens, against $0.90 in and $5.40 out for Gemini 3.5 Flash.
- Can I switch between them by changing the model id?
- Yes. Both answer in the OpenAI SDK and Gemini SDK format at the same base URL with the same key. Change the model id from gemini-3.8-flash to gemini-3.5-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.