Gemini 3.1 Pro Preview vs GPT-5.5 Instant (June 2026)
Which is better for the money: Gemini 3.1 Pro Preview by Google or GPT-5.5 Instant (June 2026) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
Gemini 3.1 Pro Preview scores 3.7 points higher (29.7 vs 26.0) but costs 2.1× as much to run the benchmark ($2072 vs $987; flagship vs premium cost classes). Pick Gemini 3.1 Pro Preview when the extra intelligence is worth the premium, otherwise GPT-5.5 Instant (June 2026).
| Metric | Gemini 3.1 Pro Preview | GPT-5.5 Instant (June 2026) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.7 | 26.0 | −12.5% GPT-5.5 Instant (June… is 12.5% less intelligent |
| Total AA cost (lower is better) | $2,072.49 | $986.85 | −52.4% GPT-5.5 Instant (June… is 52.4% cheaper |
| End-to-end time (lower is better) | 28.29s | 16.68s | −41.0% GPT-5.5 Instant (June… is 41.0% faster |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $5.00 / $30.0 | |
| Input modalities | Text, Image, Speech, Video | Text, Image |
GPT-5.5 Instant (June 2026) vs Gemini 3.1 Pro Preview: 12.5% less intelligence, 52.4% less cost to run the AA benchmark, and 41.0% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Gemini 3.1 Pro Preview is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GPT-5.5 Instant (June 2026) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
Gemini 3.1 Pro PreviewGPT-5.5 Instant (June 2026)Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gemini-3-1-pro-preview/gpt-5-5-instant-06-26 · Markdown: /api/v1/compare/gemini-3-1-pro-preview/gpt-5-5-instant-06-26?format=md · llms.txt · agent skill