Gemini 3.8 Flash vs GPT-6 Astra
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 3.8 Flash | GPT-6 Astra | Advantage |
|---|---|---|---|
| Capability | 53% | 57% | +3% (GPT-6 Astra leads) |
| Median task time | 4m 14s | 1m 56s | 2m 18s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.063 / task | $0.046 / task | $0.017 / task lower (GPT-6 Astra leads) |
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. GPT-6 Astra: 3.0% of ChatGPT Pro $100 (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 | GPT-6 Astra | Advantage |
|---|---|---|---|
| Capability | 39% | 74% | +35% (GPT-6 Astra leads) |
| Median task time | 2m 39s | 4m 0s | 1m 21s faster (Gemini 3.8 Flash leads) |
| Approx. task cost | $0.022 / task | $0.057 / task | $0.035 / task lower (Gemini 3.8 Flash leads) |
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. GPT-6 Astra: 1.0% of ChatGPT Pro $100 (1.0% / 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 | GPT-6 Astra | Advantage |
|---|---|---|---|
| Capability | 52% | 61% | +9% (GPT-6 Astra leads) |
| Median task time | 7m 7s | 2m 54s | 4m 13s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.046 / task | $0.046 / task | $0.000 / task lower (Gemini 3.8 Flash leads) |
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. GPT-6 Astra: 0.2% of ChatGPT Pro $100 (0.2% / 1w) 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 GPT-6 Astra?
Gemini 3.8 Flash clears higher: tier 3 of 5 versus tier 2 for GPT-6 Astra on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-02.