Gemini 3.1 Pro vs GPT-5.6 Sol
GPT-5.6 Sol was superseded by GPT-6.1 Sol.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-5.6 Sol leads overall, C- to F. The two cost about the same per task. By suite, GPT-5.6 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-5.6 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-5.6 Sol vs Gemini 3.1 Pro
GPT-5.6 Sol leads overall, C- to F. By suite: GPT-5.6 Sol takes real-world issues, C- to D+ (60% vs 53% capability); GPT-5.6 Sol takes spec planning, C+ to F (68% vs 21% capability); GPT-5.6 Sol takes vibe coding, D+ to F (51% 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-5.6 Sol used 3% of ChatGPT Pro 5x's weekly limit per pass, $0.036 per task at the listed price. Per task the two cost about the same ($0.038 vs $0.036). GPT-5.6 Sol is faster on real-world issues: a median task takes 3m 13s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over GPT-5.6 Sol this week.
Changed since the previous graded week: 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-5.6 Sol: vibe coding C- to D+.
| Dimension | Gemini 3.1 Pro | GPT-5.6 Sol | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (GPT-5.6 Sol leads) |
| Median task time | 4m 53s | 3m 13s | 1m 40s faster (GPT-5.6 Sol leads) |
| Approx. task cost | $0.045 / task | $0.031 / task | $0.015 / task lower (GPT-5.6 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-5.6 Sol: 2.0% of ChatGPT Pro 5x (2.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | GPT-5.6 Sol | Advantage |
|---|---|---|---|
| Capability | 21% | 68% | +47% (GPT-5.6 Sol leads) |
| Median task time | 1m 46s | 6m 0s | 4m 14s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.013 / task | $0.057 / task | $0.045 / 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-5.6 Sol: 1.0% of ChatGPT Pro 5x (1.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | GPT-5.6 Sol | Advantage |
|---|---|---|---|
| Capability | 27% | 51% | +24% (GPT-5.6 Sol leads) |
| Median task time | 4m 38s | 3m 56s | 41s faster (GPT-5.6 Sol leads) |
| Approx. task cost | $0.034 / task | $0.092 / task | $0.058 / task lower (Gemini 3.1 Pro 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-5.6 Sol: 0.4% of ChatGPT Pro 5x (0.4% / 1w) per good solve. 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-5.6 Sol?
GPT-5.6 Sol clears higher: tier 4 of 5 versus tier 3 for Gemini 3.1 Pro 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-5.6 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-5.6 Sol used 3% of ChatGPT Pro 5x's weekly limit per pass, $0.036 per task at the listed price. Per task the two cost about the same ($0.038 vs $0.036).