Gemini 3.1 Pro vs GPT-6 Sol
GPT-6 Sol was superseded by GPT-6.1 Sol. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
GPT-6 Sol leads overall, C- to F. GPT-6 Sol is about 2.3x cheaper per task. By suite, GPT-6 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 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 Sol vs Gemini 3.1 Pro
GPT-6 Sol leads overall, C- to F. By suite: GPT-6 Sol takes real-world issues, C- to D+ (55% vs 53% capability); GPT-6 Sol takes spec planning, C- to F (60% vs 21% capability); GPT-6 Sol takes vibe coding, C- to F (61% 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 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 2.3x cheaper ($0.017 vs $0.038). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over GPT-6 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 Sol: real-world issues D- to C-, real-world issues usage 4% to 5% of the weekly limit, spec planning C to C-, spec planning usage 1% to 2% of the weekly limit, vibe coding D+ to C-.
| Dimension | Gemini 3.1 Pro | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 53% | 55% | +2% (GPT-6 Sol leads) |
| Median task time | 4m 53s | 1m 41s | 3m 12s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.045 / task | $0.015 / task | $0.030 / task lower (GPT-6 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 Sol: 5.0% of ChatGPT Plus (35.0% / 5h, 5.0% / 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 Sol | Advantage |
|---|---|---|---|
| Capability | 21% | 60% | +40% (GPT-6 Sol leads) |
| Median task time | 1m 46s | 2m 58s | 1m 12s 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 Sol: 2.0% of ChatGPT Plus (10.0% / 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 Sol | Advantage |
|---|---|---|---|
| Capability | 27% | 61% | +34% (GPT-6 Sol leads) |
| Median task time | 4m 38s | 2m 44s | 1m 53s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.034 / task | $0.018 / task | $0.016 / task lower (GPT-6 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 Sol: 0.4% of ChatGPT Plus (1.8% / 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 Sol?
Gemini 3.1 Pro clears higher: tier 3 of 5 versus tier 1 for GPT-6 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 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 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 2.3x cheaper ($0.017 vs $0.038).