Gemini 3.1 Pro vs Gemini 3.8 Flash
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.
| Dimension | Gemini 3.1 Pro | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Capability | 47% | 53% | +7% (Gemini 3.8 Flash leads) |
| Median task time | 3m 14s | 4m 14s | 1m 0s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.027 / task | $0.063 / task | $0.035 / task lower (Gemini 3.1 Pro leads) |
Gemini 3.1 Pro: 9.0% of Google AI Pro (53.7% / 5h, 9.0% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Gemini 3.8 Flash: 20.4% of Google AI Pro (122.4% / 5h, 20.4% / 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.
| Dimension | Gemini 3.1 Pro | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Capability | 18% | 39% | +21% (Gemini 3.8 Flash leads) |
| Median task time | 2m 21s | 2m 39s | 18s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.014 / task | $0.022 / task | $0.008 / task lower (Gemini 3.1 Pro leads) |
Gemini 3.1 Pro: 1.2% of Google AI Pro (7.3% / 5h, 1.2% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Gemini 3.8 Flash: 1.9% of Google AI Pro (11.7% / 5h, 1.9% / 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.
| Dimension | Gemini 3.1 Pro | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Capability | 40% | 52% | +12% (Gemini 3.8 Flash leads) |
| Median task time | 4m 42s | 7m 7s | 2m 25s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.034 / task | $0.046 / task | $0.012 / 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 3.8 Flash: 1.0% of Google AI Pro (6.0% / 5h, 1.0% / 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 3.8 Flash?
Both clear tier 3 of 5, but Gemini 3.8 Flash scores higher on capability: 53% versus 47% on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-31.