Gemini 3.8 Flash vs GPT-6 Sol
GPT-6 Sol was superseded by GPT-6.1 Sol.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.
Both grade C- overall. GPT-6 Sol is about 3.4x cheaper per task. By suite, real-world issues is even at C- and GPT-6 Sol 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: GPT-6 Sol vs Gemini 3.8 Flash
Both grade C- overall. By suite: real-world issues is even at C- (60% vs 55% capability); GPT-6 Sol takes spec planning, C- to D+ (60% 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. GPT-6 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 3.4x cheaper ($0.017 vs $0.057). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 5m 21s. Both finished every task on it.
Changed since W39: 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; GPT-6 Sol: real-world issues D- to C-, real-world issues usage 4% to 5% of the weekly limit, spec planning C to C-, spec planning usage 1% to 2% of the weekly limit, vibe coding D+ to C-.
| Dimension | Gemini 3.8 Flash | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 60% | 55% | +5% (Gemini 3.8 Flash leads) |
| Median task time | 5m 21s | 1m 41s | 3m 40s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.067 / task | $0.015 / task | $0.052 / task lower (GPT-6 Sol 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. GPT-6 Sol: 5.0% of ChatGPT Plus (35.0% / 5h, 5.0% / 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 3.8 Flash | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 50% | 60% | +10% (GPT-6 Sol leads) |
| Median task time | 3m 0s | 2m 58s | 3s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.021 / task | $0.023 / task | $0.002 / 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. GPT-6 Sol: 2.0% of ChatGPT Plus (10.0% / 5h, 2.0% / 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 3.8 Flash | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 56% | 61% | +5% (GPT-6 Sol leads) |
| Median task time | 7m 51s | 2m 44s | 5m 7s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.048 / task | $0.018 / task | $0.030 / task lower (GPT-6 Sol 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. GPT-6 Sol: 0.4% of ChatGPT Plus (1.8% / 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 3.8 Flash or GPT-6 Sol?
Gemini 3.8 Flash clears higher: tier 4 of 5 versus tier 1 for GPT-6 Sol on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-27.
Which is cheaper per task, Gemini 3.8 Flash or GPT-6 Sol?
Gemini 3.8 Flash used 23.7% of Google AI Pro's weekly limit per pass, $0.057 per task at the listed price. GPT-6 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 3.4x cheaper ($0.017 vs $0.057).