Home / Compare / Gemini 3.1 Pro Preview vs gpt-oss-120b

Gemini 3.1 Pro Preview vs gpt-oss-120b

For a typical chat reply (2,000 tokens in, 400 out), Gemini 3.1 Pro Preview costs 16× as much as gpt-oss-120b: $8.80 against $0.54 per 1,000 requests at list price on 2026-09-28.

Gemini 3.1 Pro Previewgpt-oss-120b
Input, per 1M tokens$2.00$0.15
Output, per 1M tokens$12.00$0.60
Context window1.05M131K
Classification or routing (600 tokens in, 10 out), per 1,000$1.32$0.096
Chat reply (2,000 in, 400 out), per 1,000$8.80$0.54
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$22.00$1.50
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400not measured329

Which one should carry your traffic?

If gpt-oss-120b answers your requests as well as Gemini 3.1 Pro Preview, moving that traffic saves 94% 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 3.1 Pro Preview.

Gemini 3.1 Pro Preview profile · gpt-oss-120b profile · Measure it on your traffic