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Gemini 3.8 Flash vs gpt-oss-120b

For a typical chat reply (2,000 tokens in, 400 out), Gemini 3.8 Flash costs 5.6× as much as gpt-oss-120b: $3.00 against $0.54 per 1,000 requests at list price on 2026-09-28.

Gemini 3.8 Flashgpt-oss-120b
Input, per 1M tokens$0.75$0.15
Output, per 1M tokens$3.75$0.60
Context window1.05M131K
Classification or routing (600 tokens in, 10 out), per 1,000$0.487$0.096
Chat reply (2,000 in, 400 out), per 1,000$3.00$0.54
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$7.88$1.50
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400331329

Which one should carry your traffic?

If gpt-oss-120b answers your requests as well as Gemini 3.8 Flash, moving that traffic saves 82% on chat-shaped requests. Averages cannot tell you whether it does for your requests. gpt-oss-120b exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to Gemini 3.8 Flash.

Gemini 3.8 Flash profile · gpt-oss-120b profile · Measure it on your traffic