Gemini 3.8 Flash vs GPT-6 Sol
GPT-6 Sol leads overall, D+ to D. GPT-6 Sol is about 4.0x cheaper per task. By suite, GPT-6 Sol takes real-world issues (D- to F) and spec planning (C to D+). The data gives no reason to pick Gemini 3.8 Flash over GPT-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-6 Sol vs Gemini 3.8 Flash
GPT-6 Sol leads overall, D+ to D. By suite: GPT-6 Sol takes real-world issues, D- to F (38% vs 28% capability); GPT-6 Sol takes spec planning, C to D+ (64% vs 50% capability); vibe coding is even at D+ (52% vs 51% capability). Gemini 3.8 Flash used 19.9% of Google AI Pro's weekly limit per pass, $0.048 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task, GPT-6 Sol is about 4.0x cheaper ($0.012 vs $0.048). GPT-6 Sol is faster on real-world issues: a median task takes 2m 44s against 3m 11s. Both finished every task on it. The data gives no reason to pick Gemini 3.8 Flash over GPT-6 Sol this week.
Changed since W38: Gemini 3.8 Flash: real-world issues D+ to F, real-world issues usage 18.4% to 18.0% of the weekly limit, spec planning D to D+, spec planning usage 1.7% to 2.0% of the weekly limit, vibe coding C- to D+, vibe coding usage 1.0% to 1.2% of the weekly limit.
| Dimension | Gemini 3.8 Flash | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 28% | 38% | +10% (GPT-6 Sol leads) |
| Median task time | 3m 11s | 2m 44s | 27s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.055 / task | $0.012 / task | $0.043 / task lower (GPT-6 Sol leads) |
Gemini 3.8 Flash: 18.0% of Google AI Pro (107.8% / 5h, 18.0% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6 Sol: 4.0% of ChatGPT Plus (37.0% / 5h, 4.0% / 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% | 64% | +14% (GPT-6 Sol leads) |
| Median task time | 2m 23s | 2m 23s | 1s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.023 / task | $0.011 / task | $0.011 / task lower (GPT-6 Sol leads) |
Gemini 3.8 Flash: 2.0% of Google AI Pro (11.7% / 5h, 2.0% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-6 Sol: 1.0% of ChatGPT Plus (8.0% / 5h, 1.0% / 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 | 52% | 51% | +1% (Gemini 3.8 Flash leads) |
| Median task time | 6m 42s | 3m 4s | 3m 37s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.054 / task | $0.018 / task | $0.036 / task lower (GPT-6 Sol leads) |
Gemini 3.8 Flash: 1.2% of Google AI Pro (7.0% / 5h, 1.2% / 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 (2.4% / 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?
GPT-6 Sol clears higher: tier 1 of 5 versus tier 0 for Gemini 3.8 Flash on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-20.
Which is cheaper per task, Gemini 3.8 Flash or GPT-6 Sol?
Gemini 3.8 Flash used 19.9% of Google AI Pro's weekly limit per pass, $0.048 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task, GPT-6 Sol is about 4.0x cheaper ($0.012 vs $0.048).