Electricity Bench

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.

Gemini 3.8 FlashClears tier 3 (partial tier 5) at 20.4% of Google AI Pro per runDOVERALLClaude Fable 5Clears tier 4 (partial tier 5) at 33.0% of Claude Max 20x per runCOVERALL
real-world@v3DvsC
DimensionGemini 3.8 FlashClaude Fable 5Advantage
Capability53%60%+7% (Claude Fable 5 leads)
Median task time4m 14s2m 37s1m 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.

spec-planning@v1DvsC
DimensionGemini 3.8 FlashClaude Fable 5Advantage
Capability39%63%+24% (Claude Fable 5 leads)
Median task time2m 39s5m 32s2m 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.

vibe-coding@v1DvsC
DimensionGemini 3.8 FlashClaude Fable 5Advantage
Capability52%74%+22% (Claude Fable 5 leads)
Median task time7m 7s5m 28s1m 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.