Model Comparison
Claude Fable 5.2 vs Claude Haiku 5.5
Claude Fable 5.2 (xhigh) leads Claude Haiku 5.5 (max effort) by 759 Elo, and their 95% ranges sit 670 Elo apart. Even Claude Fable 5.2's lowest-rated configuration, Claude Fable 5.2 (low), ranks above Claude Haiku 5.5 (max effort). Among 87 models, each ranked by its best configuration, Claude Fable 5.2 is #2 and Claude Haiku 5.5 is #20. Cost per script: $2.22 for Claude Fable 5.2 (xhigh) and $0.103 for Claude Haiku 5.5 (max effort).
Last updated , from board data generated at 17:52 UTC.
Picks and Verdict
PickClaude Fable 5.2
Claude Fable 5.2 (high)
Pick Claude Fable 5.2 (high) for anything going on camera, since it sits 597 Elo above Haiku's best and leads it on all nine metrics, at $1.22 a script and 4.0 minutes.
PickClaude Haiku 5.5
Claude Haiku 5.5 (xhigh)
Pick Claude Haiku 5.5 (xhigh) for high-volume drafts at $0.029 a script, since its range overlaps max effort's at under a third of the price.
Every Claude Fable 5.2 setting outranks every Claude Haiku 5.5 setting, so on Haiku's side the real question is which setting to run for cheap volume. Fable 5.2 is the #2 model of 87 and Haiku 5.5 the #20 model, each ranked by its best configuration. Claude Fable 5.2 (xhigh) sits 759 Elo above Claude Haiku 5.5 (max effort), and Claude Fable 5.2 (high) sits 597 Elo above it and leads on all nine metrics, for about 12 times the price. Haiku climbs 482 Elo from low to max effort, and xhigh already gets most of that. Claude Haiku 5.5 (xhigh) costs $0.029 and takes 3.6 minutes. Max effort sits 68 Elo above it with an overlapping range, for about three and a half times the price and 12.6 minutes, so I'd leave max off. Below xhigh, Haiku drops 198 Elo to high. On Fable, xhigh adds 162 Elo over high with separate ranges at $2.22 and 7.4 minutes, and max effort costs about 2.6 times as much for 27 Elo less. For a script I'll record, I'd run Fable 5.2, and Haiku at xhigh covers bulk drafts.
Disclosure: both models come from the same lab as one of the four judges, Claude Opus 5.5. The other judges sit outside that lab, so neither is scored by its own lab alone (how the panel works). The judge analysis measures how much each judge favors its own lab.
How to Read the Writing Score, Writing Elo and 95% Ranges
Writing Score and Writing Elo. The Writing Score (0 to 100) is the weighted average of the nine metric scores: seven from the judges, Length Adherence from code and the Slop Score half from each. The Writing Elo is a rating from pairwise comparisons: on each script, each configuration's average across its drafts is compared with every other configuration's, and gaps within the draft-to-draft variation count as draws. Elo rewards winning often, so the two can put configurations in a different order.
Elo ranges. Each 95% range shows how far a configuration's Elo could move if the drafts had come out slightly differently. It comes from resampling every configuration's recorded draft scores on each reference script and ranking again. Comparing two separate ranges does not test the Elo gap between them: ranges far apart are strong evidence for the order, and overlapping ranges do not mean a tie. The reference scripts stay fixed, so the ranges say nothing about new scripts. The methodology page has the full description.
All Thinking Levels of Both Models
Every ranked configuration of Claude Fable 5.2 and Claude Haiku 5.5, scored on the same 10 scripts by the same four judges.
- Each row is one configuration: the model at one thinking level. The dot is its Writing Elo, a rating from pairwise comparisons of the scores on each script, and the bar is its 95% range: how far that Elo could move if the drafts had come out slightly differently.
- Each bar describes one configuration. Overlap alone does not establish a tie or decide their order. Comparing these ranges does not directly test the difference between a pair.
- The table under the chart lists the same configurations in the same order and adds the Writing Score (the 0 to 100 consensus of the judges and code), cost, time and configuration rank (the place among all configurations on the board).
Shaded rows are the configurations chosen for the metric comparison below.
| Configuration | Writing Elo | 95% Range | Writing Score | Cost / Script | Time / Script | Configuration Rank |
|---|---|---|---|---|---|---|
| Claude Fable 5.2 (xhigh) | 2673 | 2630 to 2717 | 85.6 | $2.22 | 7.4 min | #3 |
| Claude Fable 5.2 (max effort) | 2646 | 2599 to 2689 | 85.5 | $5.75 | 19.9 min | #4 |
| Claude Fable 5.2 (high) | 2511 | 2455 to 2555 | 84.8 | $1.22 | 4.0 min | #5 |
| Claude Fable 5.2 (medium) | 2422 | 2370 to 2469 | 84.3 | $0.561 | 1.8 min | #11 |
| Claude Fable 5.2 (low) | 2415 | 2370 to 2454 | 84.1 | $0.460 | 1.4 min | #12 |
| Claude Haiku 5.5 (max effort) | 1914 | 1874 to 1960 | 80.8 | $0.103 | 12.6 min | #42 |
| Claude Haiku 5.5 (xhigh) | 1846 | 1804 to 1887 | 80.0 | $0.029 | 3.6 min | #56 |
| Claude Haiku 5.5 (high) | 1648 | 1603 to 1695 | 78.0 | $0.012 | 1.5 min | #71 |
| Claude Haiku 5.5 (medium) | 1551 | 1505 to 1593 | 76.7 | $0.0067 | 0.8 min | #84 |
| Claude Haiku 5.5 (low) | 1432 | 1383 to 1475 | 75.2 | $0.0045 | 0.5 min | #96 |
Cost is one script at the API list price of the route used, uncached and without judging. Time is the average for one accepted script, retries included.
Computed Findings Across Thinking Levels
Each finding is computed from the configurations above. The 95% ranges describe individual configurations; overlap alone establishes neither a tie nor an order for a pair.
- Best Configurations Head to Head. Claude Fable 5.2 (xhigh) leads Claude Haiku 5.5 (max effort) by 759 Elo, and their 95% ranges do not overlap (2630 to 2717 against 1874 to 1960), which is strong evidence for that order.
- Every Claude Fable 5.2 Configuration Ranks Higher. All five Claude Fable 5.2 configurations rank above all five Claude Haiku 5.5 configurations: the lowest-rated, Claude Fable 5.2 (low) at Elo 2415, still beats Claude Haiku 5.5 (max effort) at Elo 1914. Their 95% ranges do not overlap.
- Lowest Thinking Levels Head to Head. At their lowest thinking levels, Claude Fable 5.2 (low) at Elo 2415 and $0.460 per script leads Claude Haiku 5.5 (low) at Elo 1432 and $0.0045 per script by 983 Elo. Their 95% ranges do not overlap.
- Same Level Name, Side by Side. Claude Fable 5.2 has the higher Writing Elo at every level name both models use: low, medium, high, xhigh, and max. The 95% ranges do not overlap at any of them. Level names come from each provider, so the same name does not promise the same reasoning budget.
- Cheapest Claude Fable 5.2 Configuration Above Claude Haiku 5.5's Best. The cheapest Claude Fable 5.2 configuration with a higher Writing Elo than Claude Haiku 5.5 (max effort), at Elo 1914 and $0.103 per script, is Claude Fable 5.2 (low), at Elo 2415 and $0.460 per script. It costs about 4.5 times as much per script.
- Lowest to Highest Thinking Level. Claude Fable 5.2 moves +231 Elo from low to max effort, at about 13 times the cost per script. Claude Haiku 5.5 moves +482 Elo from low to max effort, at about 23 times the cost per script.
Writing Elo at Each Shared Level Name
| Level | Claude Fable 5.2 | Claude Haiku 5.5 | Gap | 95% Ranges |
|---|---|---|---|---|
| low | 2415 | 1432 | +983 | Separate |
| medium | 2422 | 1551 | +871 | Separate |
| high | 2511 | 1648 | +863 | Separate |
| xhigh | 2673 | 1846 | +827 | Separate |
| max | 2646 | 1914 | +732 | Separate |
Gap is Claude Fable 5.2 minus Claude Haiku 5.5 at the same level name, using each model's highest-rated configuration at that level.
Two Chosen Configurations Compared
Pick one configuration of each model to compare their metric scores, consistency across drafts and per-script scores. Each menu starts on the model's best configuration.
Scores by Metric
Claude Fable 5.2 (xhigh) scores higher on all nine metrics. Weighted by each metric's share of the Writing Score, Tone & Voice Match does the most to put Claude Fable 5.2 (xhigh) ahead, with a 5.4-point lead on that metric. The weight beside each metric is its share of the Writing Score.
Consistency Across Drafts
| Claude Fable 5.2 (xhigh) | Claude Haiku 5.5 (max effort) | |
|---|---|---|
| Score spread across drafts (±) | 1.44 | 1.55 |
| Lowest script score | 83.6 Script 10 | 78.2 Script 10 |
| Highest script score | 88.0 Script 9 | 82.6 Script 4 |
| Range across scripts | 4.4 | 4.4 |
Spread is how much the Writing Score moves between a configuration's drafts, and lower is steadier. Green marks the better number in each row.
Scores by Script
Writing Score on each reference script. Gap is Claude Fable 5.2 (xhigh) minus Claude Haiku 5.5 (max effort), and the higher score is in bold.
| Script | Claude Fable 5.2 (xhigh) | Claude Haiku 5.5 (max effort) | Gap |
|---|---|---|---|
| Script 1 opinion / warning explainer | 83.7 | 80.3 | +3.4 |
| Script 2 news-analysis / skeptical explainer | 85.4 | 80.7 | +4.7 |
| Script 3 personal roadmap / opinion | 85.5 | 80.8 | +4.7 |
| Script 4 short explainer | 85.4 | 82.6 | +2.8 |
| Script 5 news-analysis / opinion explainer | 86.1 | 81.7 | +4.4 |
| Script 6 founder announcement / personal origin story | 85.9 | 81.1 | +4.8 |
| Script 7 personal technical walkthrough / agentic workflow case study | 87.3 | 80.0 | +7.3 |
| Script 8 product release announcement / personal observation | 85.1 | 81.3 | +3.8 |
| Script 9 career guide / hiring analysis | 88.0 | 81.5 | +6.5 |
| Script 10 engineering process walkthrough / presentation adaptation | 83.6 | 78.2 | +5.4 |
Scorecards and Thinking Pages
Each configuration name in the table above opens its own scorecard.
Compare With Another Model
Pick a second model. A pair with its own written match-up opens that page, and any other pair opens in the comparison tool.
Nearby Match-Ups by Best Writing Elo
Every configuration wrote five drafts for each of the same 10 briefs, from the same prompt. Generation was closed-book, with the prompt as the only source and no web search or other tools. Each judge scores every draft once: Claude Opus 5.5 at medium effort through the Claude Code subscription, GPT-6.1 Sol at medium reasoning through the Codex CLI, GLM 5.3 Flash through OpenRouter, and Jev 1.13, a typed judge from TypeSafe that answers each metric as a multiple-choice question. The channel's finished script is their reference for the voice, and it gets no score on the board itself.
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