Gemini 3.6 Flash vs Claude Fable 5.1
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 3.6 Flash | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Capability | 60% | 73% | +13% (Claude Fable 5.1 leads) |
| Median task time | 2m 17s | 1m 46s | 31s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.039 / task | $0.026 / task | $0.013 / task lower (Claude Fable 5.1 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. Claude Fable 5.1: 28.0% of Claude Max 20x (28.0% / 5h, 5.0% / 1w) per run. Its weekly limit holds about 7.2 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 Claude Fable 5.1 has run this suite, so there is no head-to-head yet.
| Dimension | Gemini 3.6 Flash | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Capability | 72% | 85% | +13% (Claude Fable 5.1 leads) |
| Median task time | 1m 54s | 3m 48s | 1m 54s faster (Gemini 3.6 Flash leads) |
| Approx. task cost | $0.038 / task | $0.025 / task | $0.013 / task lower (Claude Fable 5.1 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. Claude Fable 5.1: 1.8% of Claude Max 20x (1.8% / 5h, 0.2% / 1w) per good solve. Its weekly limit holds about 7.2 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 Claude Fable 5.1?
Both clear tier 4 of 5, but Claude Fable 5.1 scores higher on capability: 73% versus 60% on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-10.