Gemini 3.1 Pro vs GPT-6.1 Sol
GPT-6.1 Sol leads overall, C to F. GPT-6.1 Sol is about 2.6x cheaper per task. By suite, GPT-6.1 Sol takes real-world issues (C- to D+) and spec planning (C+ to F). The data gives no reason to pick Gemini 3.1 Pro over GPT-6.1 Sol this week.Measured
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
Verdict: GPT-6.1 Sol vs Gemini 3.1 Pro
GPT-6.1 Sol leads overall, C to F. By suite: GPT-6.1 Sol takes real-world issues, C- to D+ (57% vs 53% capability); GPT-6.1 Sol takes spec planning, C+ to F (73% vs 21% capability); GPT-6.1 Sol takes vibe coding, C+ to F (72% vs 27% capability). Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. GPT-6.1 Sol used 6% of ChatGPT Plus's weekly limit per pass, $0.015 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.2% of ChatGPT Pro 5x's weekly limit (est, about $0.015 per task). Per task, GPT-6.1 Sol is about 2.6x cheaper ($0.015 vs $0.038). GPT-6.1 Sol is faster on real-world issues: a median task takes 3m 26s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over GPT-6.1 Sol this week.
Changed since W39: Gemini 3.1 Pro: real-world issues usage 9.8% to 14.8% of the weekly limit, spec planning usage 0.9% to 1.1% of the weekly limit, vibe coding usage 1.0% to 0.7% of the weekly limit; GPT-6.1 Sol has one graded week under this version (W40).
| Dimension | Gemini 3.1 Pro | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 53% | 57% | +3% (GPT-6.1 Sol leads) |
| Median task time | 4m 53s | 3m 26s | 1m 27s faster (GPT-6.1 Sol leads) |
| Approx. task cost | $0.045 / task | $0.012 / task | $0.033 / task lower (GPT-6.1 Sol leads) |
Gemini 3.1 Pro: 14.8% of Google AI Pro (88.9% / 5h, 14.8% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6.1 Sol: 4.0% of ChatGPT Plus (28.0% / 5h, 4.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 21% | 73% | +52% (GPT-6.1 Sol leads) |
| Median task time | 1m 46s | 6m 22s | 4m 36s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.013 / task | $0.023 / task | $0.010 / task lower (Gemini 3.1 Pro leads) |
Gemini 3.1 Pro: 1.1% of Google AI Pro (6.5% / 5h, 1.1% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6.1 Sol: 2.0% of ChatGPT Plus (9.0% / 5h, 2.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 27% | 72% | +45% (GPT-6.1 Sol leads) |
| Median task time | 4m 38s | 4m 55s | 17s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.034 / task | $0.018 / task | $0.016 / task lower (GPT-6.1 Sol leads) |
Gemini 3.1 Pro: 0.7% of Google AI Pro (4.4% / 5h, 0.7% / 1w) per good solve. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6.1 Sol: 0.4% of ChatGPT Plus (2.2% / 5h, 0.4% / 1w) per good solve. Its weekly limit holds about 6 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, Gemini 3.1 Pro or GPT-6.1 Sol?
Gemini 3.1 Pro clears higher: tier 3 of 5 versus tier 2 for GPT-6.1 Sol on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-28.
Which is cheaper per task, Gemini 3.1 Pro or GPT-6.1 Sol?
Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. GPT-6.1 Sol used 6% of ChatGPT Plus's weekly limit per pass, $0.015 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.2% of ChatGPT Pro 5x's weekly limit (est, about $0.015 per task). Per task, GPT-6.1 Sol is about 2.6x cheaper ($0.015 vs $0.038).