Claude Fable 5 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 | Claude Fable 5 | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Capability | 60% | 73% | +13% (Claude Fable 5.1 leads) |
| Median task time | 2m 37s | 1m 46s | 51s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.030 / task | $0.026 / task | $0.005 / task lower (Claude Fable 5.1 leads) |
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. 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.
Work per window: Claude Fable 5 443 vs Claude Fable 5.1 522 suite runs per month (Claude Fable 5.1 leads); per plan-dollar: 2.21 vs 2.61 (Claude Fable 5.1 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.
| Dimension | Claude Fable 5 | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Capability | 63% | 74% | +11% (Claude Fable 5.1 leads) |
| Median task time | 5m 32s | 6m 51s | 1m 19s faster (Claude Fable 5 leads) |
| Approx. task cost | $0.034 / task | $0.051 / task | $0.017 / task lower (Claude Fable 5 leads) |
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. Claude Fable 5.1: 15.0% of Claude Max 20x (15.0% / 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.
Work per window: Claude Fable 5 1461 vs Claude Fable 5.1 974 suite runs per month (Claude Fable 5 leads); per plan-dollar: 7.30 vs 4.87 (Claude Fable 5 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.
| Dimension | Claude Fable 5 | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Capability | 74% | 85% | +10% (Claude Fable 5.1 leads) |
| Median task time | 5m 28s | 3m 48s | 1m 41s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.038 / task | $0.025 / task | $0.014 / task lower (Claude Fable 5.1 leads) |
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. 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.
Work per window: Claude Fable 5 5218 vs Claude Fable 5.1 8117 good solves per month (Claude Fable 5.1 leads); per plan-dollar: 26.09 vs 40.58 (Claude Fable 5.1 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 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 2026-08-30.
Which gives more work per dollar, Claude Fable 5 or Claude Fable 5.1?
Claude Fable 5.1 delivers more benchmark work per subscription dollar: 2.61 suite runs per plan-dollar versus 2.21 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 Fable 5.1 cost?
Claude Fable 5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05). Claude Fable 5.1 runs on Claude Max 20x at $200/month (public price as of 2026-08-05).