Electricity Bench

claude-fable-5 vs claude-opus-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.

claude-fable-5Clears tier 4 (partial tier 5) at 34.0% of Claude Max 20x per runCOVERALLclaude-opus-5Clears tier 2 (partial tier 5) at 11.0% of Claude Max 20x per runCOVERALL
real-world@v3CvsC
Dimensionclaude-fable-5claude-opus-5Advantage
Capability60%57%+3% (claude-fable-5 leads)
Median task time3m 5s3m 57s52s faster (claude-fable-5 leads)
Approx. task cost$0.031 / task$0.010 / task$0.021 / task lower (claude-opus-5 leads)

claude-fable-5: 34.0% of Claude Max 20x (34.0% / 5h, 4.0% / 1w) per run. claude-opus-5: 11.0% of Claude Max 20x (11.0% / 5h) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.

Work per window: claude-fable-5 430 vs claude-opus-5 1328 suite runs per month (claude-opus-5 leads); per plan-dollar: 2.15 vs 6.64 (claude-opus-5 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.

vibe-coding@v1BvsD
Dimensionclaude-fable-5claude-opus-5Advantage
Capability85%54%+31% (claude-fable-5 leads)
Median task time5m 11s6m 57s1m 46s faster (claude-fable-5 leads)
Approx. task cost$0.038 / task$0.016 / task$0.022 / task lower (claude-opus-5 leads)

claude-fable-5: 2.8% of Claude Max 20x (2.8% / 5h, 0.6% / 1w) per good solve. claude-opus-5: 1.2% of Claude Max 20x (1.2% / 5h) per good solve. Each figure is a share of that agent's own plan, so there is no delta to draw.

Work per window: claude-fable-5 5218 vs claude-opus-5 12175 good solves per month (claude-opus-5 leads); per plan-dollar: 26.09 vs 60.88 (claude-opus-5 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.

Grades and deltas are comparable only within a suite version. See methodology.

Frequently asked questions

Which is better for coding, claude-fable-5 or claude-opus-5?

claude-fable-5 clears higher: tier 4 of 5 versus tier 2 for claude-opus-5 on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-10.

Which gives more work per dollar, claude-fable-5 or claude-opus-5?

claude-opus-5 delivers more benchmark work per subscription dollar: 6.64 suite runs per plan-dollar versus 2.15 for claude-fable-5 (at $200/month priced 2026-08-05, and $200/month priced 2026-08-05). Work figures compare outputs, so unlike raw quota shares they are comparable across plans.

How much do claude-fable-5 and claude-opus-5 cost?

claude-fable-5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05). claude-opus-5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05).