Gemini 3.1 Pro vs GPT-6 Sol
GPT-6 Sol leads overall, D+ to F. GPT-6 Sol is about 2.2x cheaper per task. By suite, Gemini 3.1 Pro takes real-world issues (D+ to D-) and GPT-6 Sol takes spec planning (C to F). Take Gemini 3.1 Pro anyway when you want the side that is ahead on real-world issues.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, D+ to F. By suite: Gemini 3.1 Pro takes real-world issues, D+ to D- (53% vs 38% capability); GPT-6 Sol takes spec planning, C to F (64% vs 15% capability); GPT-6 Sol takes vibe coding, D+ to F (51% vs 35% capability). Gemini 3.1 Pro used 10.8% of Google AI Pro's weekly limit per pass, $0.026 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task, GPT-6 Sol is about 2.2x cheaper ($0.012 vs $0.026). GPT-6 Sol is faster on real-world issues: a median task takes 2m 44s against 2m 55s. Both finished every task on it. Reasons to pick Gemini 3.1 Pro anyway: it leads on real-world issues (D+ to D-).
Changed since W38: Gemini 3.1 Pro: real-world issues F to D+, real-world issues usage 11.2% to 9.8% of the weekly limit, spec planning usage 1.0% to 0.9% of the weekly limit.
| Dimension | Gemini 3.1 Pro | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 53% | 38% | +15% (Gemini 3.1 Pro leads) |
| Median task time | 2m 55s | 2m 44s | 11s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.030 / task | $0.012 / task | $0.018 / task lower (GPT-6 Sol leads) |
Gemini 3.1 Pro: 9.8% of Google AI Pro (59.0% / 5h, 9.8% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6 Sol: 4.0% of ChatGPT Plus (37.0% / 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 Sol | Advantage |
|---|---|---|---|
| Capability | 15% | 64% | +48% (GPT-6 Sol leads) |
| Median task time | 1m 46s | 2m 23s | 36s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.011 / task | $0.011 / task | $0.001 / task lower (Gemini 3.1 Pro leads) |
Gemini 3.1 Pro: 0.9% of Google AI Pro (5.6% / 5h, 0.9% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6 Sol: 1.0% of ChatGPT Plus (8.0% / 5h, 1.0% / 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 | 35% | 51% | +16% (GPT-6 Sol leads) |
| Median task time | 4m 33s | 3m 4s | 1m 29s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.045 / task | $0.018 / task | $0.026 / task lower (GPT-6 Sol leads) |
Gemini 3.1 Pro: 1.0% of Google AI Pro (5.8% / 5h, 1.0% / 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 (2.4% / 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 2026-09-21.
Which is cheaper per task, Gemini 3.1 Pro or GPT-6 Sol?
Gemini 3.1 Pro used 10.8% of Google AI Pro's weekly limit per pass, $0.026 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task, GPT-6 Sol is about 2.2x cheaper ($0.012 vs $0.026).