Gemini 3.1 Pro vs Gemini 3.6 Flash
Gemini 3.6 Flash was superseded by Gemini 3.8 Flash. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Gemini 3.6 Flash leads overall, C to F. The two cost about the same per task. By suite, Gemini 3.6 Flash takes real-world issues (C- to D+) and vibe coding (C+ to F). The data gives no reason to pick Gemini 3.1 Pro over Gemini 3.6 Flash 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: Gemini 3.6 Flash vs Gemini 3.1 Pro
Gemini 3.6 Flash leads overall, C to F. By suite: Gemini 3.6 Flash takes real-world issues, C- to D+ (60% vs 53% capability); Gemini 3.6 Flash takes vibe coding, C+ to F (72% vs 27% capability). Only Gemini 3.1 Pro has run spec planning. Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. Gemini 3.6 Flash used 12.6% of Google AI Pro's weekly limit per pass, $0.039 per task at the listed price. Per task the two cost about the same ($0.038 vs $0.039). Gemini 3.6 Flash is faster on real-world issues: a median task takes 2m 17s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over Gemini 3.6 Flash 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; Gemini 3.6 Flash unchanged.
| Dimension | Gemini 3.1 Pro | Gemini 3.6 Flash | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (Gemini 3.6 Flash leads) |
| Median task time | 4m 53s | 2m 17s | 2m 36s faster (Gemini 3.6 Flash leads) |
| Approx. task cost | $0.045 / task | $0.039 / task | $0.007 / task lower (Gemini 3.6 Flash 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. Gemini 3.6 Flash: 12.6% of Google AI Pro (about 72.1% / 5h, 12.6% / 1w) per run. Its weekly limit holds 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.
Only Gemini 3.1 Pro has run this suite, so there is no head-to-head yet.
| Dimension | Gemini 3.1 Pro | Gemini 3.6 Flash | Advantage |
|---|---|---|---|
| Capability | 27% | 72% | +45% (Gemini 3.6 Flash leads) |
| Median task time | 4m 38s | 1m 54s | 2m 44s faster (Gemini 3.6 Flash leads) |
| Approx. task cost | $0.034 / task | $0.038 / task | $0.003 / 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. Gemini 3.6 Flash: 0.8% of Google AI Pro (4.9% / 5h, 0.8% / 1w) per good solve. Its weekly limit holds 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 Gemini 3.6 Flash?
Gemini 3.6 Flash 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 Gemini 3.6 Flash?
Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. Gemini 3.6 Flash used 12.6% of Google AI Pro's weekly limit per pass, $0.039 per task at the listed price. Per task the two cost about the same ($0.038 vs $0.039).