Claude Fable 5 vs Claude Haiku 4.5
Claude Fable 5 was superseded by Claude Fable 5.1. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Claude Fable 5 leads overall, C to F. Claude Haiku 4.5 is about 14x cheaper per task. By suite, Claude Fable 5 takes real-world issues (C- to D-) and spec planning (C to F). Take Claude Haiku 4.5 anyway when you want the side that is cheaper per task.Measured
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.
Verdict: Claude Haiku 4.5 vs Claude Fable 5
Claude Fable 5 leads overall, C to F. By suite: Claude Fable 5 takes real-world issues, C- to D- (60% vs 37% capability); Claude Fable 5 takes spec planning, C to F (63% vs 21% capability); Claude Fable 5 takes vibe coding, C+ to F (74% vs 22% capability). Claude Fable 5 used 7% of Claude Max 20x's weekly limit per pass, $0.169 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~14% of Claude Max 5x's weekly limit (est, about $0.169 per task). Claude Haiku 4.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 per task at the listed price. Per task, Claude Haiku 4.5 is about 14x cheaper ($0.012 vs $0.169). Claude Fable 5 is faster on real-world issues: a median task takes 2m 37s against 3m 8s. Both finished every task on it. Reasons to pick Claude Haiku 4.5 anyway: it is cheaper per task ($0.012 vs $0.169).
Changed since the previous graded week: Claude Fable 5: real-world issues C+ to C-, vibe coding C to C+; Claude Haiku 4.5: real-world issues D+ to D-.
| Dimension | Claude Fable 5 | Claude Haiku 4.5 | Advantage |
|---|---|---|---|
| Capability | 60% | 37% | +23% (Claude Fable 5 leads) |
| Median task time | 2m 37s | 3m 8s | 31s faster (Claude Fable 5 leads) |
| Approx. task cost | $0.153 / task | $0.015 / task | $0.138 / task lower (Claude Haiku 4.5 leads) |
Claude Fable 5: 33.0% of Claude Max 20x (33.0% / 5h, 5.0% / 1w) per run. Its weekly limit holds about 7 of the week's 33.6 5h windows. Claude Haiku 4.5: 8.0% of Claude Max 5x (8.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 13.8 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 Haiku 4.5 1826 suite runs per month (Claude Haiku 4.5 leads); per plan-dollar: 2.21 vs 18.26 (Claude Haiku 4.5 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.
| Dimension | Claude Fable 5 | Claude Haiku 4.5 | Advantage |
|---|---|---|---|
| Capability | 63% | 21% | +42% (Claude Fable 5 leads) |
| Median task time | 5m 32s | 2m 8s | 3m 24s faster (Claude Haiku 4.5 leads) |
| Approx. task cost | $0.230 / task | $0.002 / task | $0.228 / task lower (Claude Haiku 4.5 leads) |
Claude Fable 5: 10.0% of Claude Max 20x (10.0% / 5h, 2.0% / 1w) per run. Its weekly limit holds about 7 of the week's 33.6 5h windows. Claude Haiku 4.5: 1.0% of Claude Max 5x (1.0% / 5h) per run. Its weekly limit holds about 13.8 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 Haiku 4.5 14610 suite runs per month (Claude Haiku 4.5 leads); per plan-dollar: 7.30 vs 146.10 (Claude Haiku 4.5 leads). Work figures compare outputs, so unlike quota shares they are comparable across plans.
| Dimension | Claude Fable 5 | Claude Haiku 4.5 | Advantage |
|---|---|---|---|
| Capability | 74% | 22% | +52% (Claude Fable 5 leads) |
| Median task time | 5m 28s | 4m 4s | 1m 25s faster (Claude Haiku 4.5 leads) |
| Approx. task cost | $0.184 / task | $0.009 / task | $0.175 / task lower (Claude Haiku 4.5 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 of the week's 33.6 5h windows. Claude Haiku 4.5: 1.3% of Claude Max 5x (1.3% / 5h) per good solve. Its weekly limit holds about 13.8 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 Haiku 4.5 11688 good solves per month (Claude Haiku 4.5 leads); per plan-dollar: 26.09 vs 116.88 (Claude Haiku 4.5 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 Haiku 4.5?
Claude Fable 5 clears higher: tier 4 of 5 versus tier 2 for Claude Haiku 4.5 on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-30.
Which is cheaper per task, Claude Fable 5 or Claude Haiku 4.5?
Claude Fable 5 used 7% of Claude Max 20x's weekly limit per pass, $0.169 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~14% of Claude Max 5x's weekly limit (est, about $0.169 per task). Claude Haiku 4.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 per task at the listed price. Per task, Claude Haiku 4.5 is about 14x cheaper ($0.012 vs $0.169).
Which gives more coding work per dollar, Claude Fable 5 or Claude Haiku 4.5?
Claude Haiku 4.5 delivers more benchmark work per subscription dollar: 18.26 suite runs per plan-dollar versus 2.21 for Claude Fable 5 (at $100/month priced 2026-07-20, and $200/month priced 2026-08-05). Work figures compare outputs, so unlike raw quota shares they are comparable across plans.
What do Claude Fable 5 and Claude Haiku 4.5 cost a month?
Claude Fable 5 runs on Claude Max 20x at $200/month (public price as of 2026-08-05). Claude Haiku 4.5 runs on Claude Max 5x at $100/month (public price as of 2026-07-20).