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Gemini 3.1 Pro Preview vs GPT-6 Sol

For a typical chat reply (2,000 tokens in, 400 out), Gemini 3.1 Pro Preview costs 1.1× as much as GPT-6 Sol: $8.80 against $8.00 per 1,000 requests at list price on 2026-09-28.

Gemini 3.1 Pro PreviewGPT-6 Sol
Input, per 1M tokens$2.00$2.00
Output, per 1M tokens$12.00$10.00
Context window1.05M1.05M
Classification or routing (600 tokens in, 10 out), per 1,000$1.32$1.30
Chat reply (2,000 in, 400 out), per 1,000$8.80$8.00
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$22.00$21.00
Confidence signalnono
Tool callingyesyes
BANKING77, correct of 400not measured330

Which one should carry your traffic?

If GPT-6 Sol answers your requests as well as Gemini 3.1 Pro Preview, moving that traffic saves 9% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GPT-6 Sol does not expose a confidence signal through OpenRouter, so Gimbix would test it as a full replacement rather than a first answer.

Gemini 3.1 Pro Preview profile · GPT-6 Sol profile · Measure it on your traffic