Gemini 3.8 Flash vs Claude Fable 5
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 | Claude Fable 5 | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (Claude Fable 5 leads) |
| Median task time | 4m 14s | 2m 37s | 1m 37s faster (Claude Fable 5 leads) |
| Approx. task cost | $0.063 / task | $0.030 / task | $0.032 / task lower (Claude Fable 5 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. Claude Fable 5: 33.0% of Claude Max 20x (33.0% / 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.
| Dimension | Gemini 3.8 Flash | Claude Fable 5 | Advantage |
|---|---|---|---|
| Capability | 39% | 63% | +24% (Claude Fable 5 leads) |
| Median task time | 2m 39s | 5m 32s | 2m 53s faster (Gemini 3.8 Flash leads) |
| Approx. task cost | $0.022 / task | $0.034 / task | $0.012 / 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. Claude Fable 5: 10.0% of Claude Max 20x (10.0% / 5h, 2.0% / 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.
| Dimension | Gemini 3.8 Flash | Claude Fable 5 | Advantage |
|---|---|---|---|
| Capability | 52% | 74% | +22% (Claude Fable 5 leads) |
| Median task time | 7m 7s | 5m 28s | 1m 38s faster (Claude Fable 5 leads) |
| Approx. task cost | $0.046 / task | $0.038 / task | $0.008 / task lower (Claude Fable 5 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. Claude Fable 5: 2.8% of Claude Max 20x (2.8% / 5h, 0.4% / 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 3.8 Flash or Claude Fable 5?
Claude Fable 5 clears higher: tier 4 of 5 versus tier 3 for Gemini 3.8 Flash on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-02.