Gemini 3.8 Flash vs Grok 4.6
Grok 4.6 was superseded by Grok 4.7. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Both grade C- overall. Gemini 3.8 Flash is about 2.7x cheaper per task. By suite, Gemini 3.8 Flash takes real-world issues (C- to D) and Grok 4.6 takes spec planning (C to D+). Both agents run the same private suite cut headless through their own tools, each on its own subscription.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: Grok 4.6 vs Gemini 3.8 Flash
Both grade C- overall. By suite: Gemini 3.8 Flash takes real-world issues, C- to D (60% vs 47% capability); Grok 4.6 takes spec planning, C to D+ (66% vs 50% capability); vibe coding is even at C- (56% vs 61% capability). Gemini 3.8 Flash used 23.7% of Google AI Pro's weekly limit per pass, $0.057 per task at the listed price. Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Per task, Gemini 3.8 Flash is about 2.7x cheaper ($0.057 vs $0.157). Gemini 3.8 Flash is faster on real-world issues: a median task takes 5m 21s against 7m 10s. Both finished every task on it.
Changed since the previous graded week: Gemini 3.8 Flash: real-world issues F to C-, real-world issues usage 18.0% to 21.9% of the weekly limit, spec planning usage 2.0% to 1.8% of the weekly limit, vibe coding D+ to C-, vibe coding usage 1.2% to 1.1% of the weekly limit; Grok 4.6: real-world issues C- to D, real-world issues usage 4% to 3% of the weekly limit, vibe coding C+ to C-.
| Dimension | Gemini 3.8 Flash | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 60% | 47% | +13% (Gemini 3.8 Flash leads) |
| Median task time | 5m 21s | 7m 10s | 1m 50s faster (Gemini 3.8 Flash leads) |
| Approx. task cost | $0.067 / task | $0.046 / task | $0.021 / task lower (Grok 4.6 leads) |
Gemini 3.8 Flash: 21.9% of Google AI Pro (131.3% / 5h, 21.9% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Grok 4.6: 3.0% of SuperGrok Plus (3.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.8 Flash | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 50% | 66% | +15% (Grok 4.6 leads) |
| Median task time | 3m 0s | 45m 26s | 42m 25s faster (Gemini 3.8 Flash leads) |
| Approx. task cost | $0.021 / task | $0.575 / task | $0.554 / task lower (Gemini 3.8 Flash leads) |
Gemini 3.8 Flash: 1.8% of Google AI Pro (11.0% / 5h, 1.8% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Grok 4.6: 10.0% of SuperGrok Plus (10.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.8 Flash | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 56% | 61% | +5% (Grok 4.6 leads) |
| Median task time | 7m 51s | 11m 14s | 3m 23s faster (Gemini 3.8 Flash leads) |
| Approx. task cost | $0.048 / task | <$0.230 / task | $0.182 / task lower (Gemini 3.8 Flash leads) |
Gemini 3.8 Flash: 1.1% of Google AI Pro (6.3% / 5h, 1.1% / 1w) per good solve. Its weekly limit holds 6 of the week's 33.6 5h windows. Grok 4.6: under 1% of SuperGrok Plus 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 3.8 Flash or Grok 4.6?
Both clear tier 4 of 5, but Gemini 3.8 Flash scores higher on capability: 60% versus 47% on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-27.
Which is cheaper per task, Gemini 3.8 Flash or Grok 4.6?
Gemini 3.8 Flash used 23.7% of Google AI Pro's weekly limit per pass, $0.057 per task at the listed price. Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Per task, Gemini 3.8 Flash is about 2.7x cheaper ($0.057 vs $0.157).