Gemini 3.6 Flash vs GPT-5.6 Terra
Gemini 3.6 Flash was superseded by Gemini 3.8 Flash. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Gemini 3.6 Flash leads overall, C to D. GPT-5.6 Terra is about 2.0x cheaper per task. By suite, Gemini 3.6 Flash takes real-world issues (C- to D+) and vibe coding (C+ to F). Take GPT-5.6 Terra anyway when you want the side that is cheaper per task.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-5.6 Terra vs Gemini 3.6 Flash
Gemini 3.6 Flash leads overall, C to D. By suite: Gemini 3.6 Flash takes real-world issues, C- to D+ (60% vs 50% capability); Gemini 3.6 Flash takes vibe coding, C+ to F (72% vs 34% capability). Only GPT-5.6 Terra has run spec planning. Gemini 3.6 Flash used 12.6% of Google AI Pro's weekly limit per pass, $0.039 per task at the listed price. GPT-5.6 Terra used 8% of ChatGPT Plus's weekly limit per pass, $0.019 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.6% of ChatGPT Pro 5x's weekly limit (est, about $0.019 per task). Per task, GPT-5.6 Terra is about 2.0x cheaper ($0.019 vs $0.039). Gemini 3.6 Flash is faster on real-world issues: a median task takes 2m 17s against 2m 18s. Both finished every task on it. Reasons to pick GPT-5.6 Terra anyway: it is cheaper per task ($0.019 vs $0.039).
Changed since the previous graded week: Gemini 3.6 Flash unchanged; GPT-5.6 Terra: real-world issues D to D+, real-world issues usage 9.2% to 7% of the weekly limit, spec planning C- to D+, spec planning usage 2.0% to 1% of the weekly limit, vibe coding F to D, vibe coding usage 0.5% to 0.6% of the weekly limit.
| Dimension | Gemini 3.6 Flash | GPT-5.6 Terra | Advantage |
|---|---|---|---|
| Capability | 60% | 50% | +10% (Gemini 3.6 Flash leads) |
| Median task time | 2m 17s | 2m 18s | 1s faster (Gemini 3.6 Flash leads) |
| Approx. task cost | $0.039 / task | $0.021 / task | $0.017 / task lower (GPT-5.6 Terra leads) |
Gemini 3.6 Flash: 12.6% of Google AI Pro (about 72.1% / 5h, 12.6% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-5.6 Terra: 7.0% of ChatGPT Plus (46.0% / 5h, 7.0% / 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.
Only GPT-5.6 Terra has run this suite, so there is no head-to-head yet.
| Dimension | Gemini 3.6 Flash | GPT-5.6 Terra | Advantage |
|---|---|---|---|
| Capability | 72% | 34% | +37% (Gemini 3.6 Flash leads) |
| Median task time | 1m 54s | 2m 47s | 53s faster (Gemini 3.6 Flash leads) |
| Approx. task cost | $0.038 / task | $0.028 / task | $0.010 / task lower (GPT-5.6 Terra leads) |
Gemini 3.6 Flash: 0.8% of Google AI Pro (4.9% / 5h, 0.8% / 1w) per good solve. Its weekly limit holds 6 of the week's 33.6 5h windows. GPT-5.6 Terra: 0.6% of ChatGPT Plus (3.0% / 5h, 0.6% / 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 3.6 Flash or GPT-5.6 Terra?
Gemini 3.6 Flash clears higher: tier 4 of 5 versus tier 2 for GPT-5.6 Terra on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-10.
Which is cheaper per task, Gemini 3.6 Flash or GPT-5.6 Terra?
Gemini 3.6 Flash used 12.6% of Google AI Pro's weekly limit per pass, $0.039 per task at the listed price. GPT-5.6 Terra used 8% of ChatGPT Plus's weekly limit per pass, $0.019 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.6% of ChatGPT Pro 5x's weekly limit (est, about $0.019 per task). Per task, GPT-5.6 Terra is about 2.0x cheaper ($0.019 vs $0.039).