Which is better: Claude Fable 5.1 or Claude Haiku 5.5?

Verdict: Claude Fable 5.1 ranks higher (#2 vs #16) and wins 5 of 5 shared benchmarks; Claude Haiku 5.5 costs less ($0.10/$0.50 vs $10.0/$50.0 per 1M tokens). AskClash compares Claude Fable 5.1 and Claude Haiku 5.5 side by side across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, AskClash ACB, and context window so you can see which model wins on each benchmark.

How do Claude Fable 5.1 and Claude Haiku 5.5 compare on coding benchmarks?

The comparison table shows SWE-bench, SWE-Pro, SWE-Atlas, Terminal-Bench, DeepSWE, and coding agent index scores for both Claude Fable 5.1 and Claude Haiku 5.5 when publicly disclosed.

LLM Comparison

Claude Fable 5.1 vs Claude Haiku 5.5: benchmark scores, pricing & comparison.

Side-by-side Claude Fable 5.1 vs Claude Haiku 5.5 comparison across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, context window, and AskClash RWT. Green marks the winner on each benchmark.

Verdict: Claude Fable 5.1 ranks higher (#2 vs #16) and wins 5 of 5 shared benchmarks; Claude Haiku 5.5 costs less ($0.10/$0.50 vs $10.0/$50.0 per 1M tokens).

Open live leaderboard Claude Fable 5.1 model page Claude Haiku 5.5 model page

Rank #2 vs #16AskClash overall scores 78.2 vs 60.0.

Pricing $10.0/$50.0 vs $0.10/$0.50Input and output token prices per 1M tokens when published.

Proprietary vs ProprietaryAnthropic vs Anthropic.

Claude Fable 5.1 vs Claude Haiku 5.5 benchmark comparison

Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.

Metric	Claude Fable 5.1	Claude Haiku 5.5
Overall Score	78.2	60.0
Leaderboard Rank	#2	#16
ACB	79.2	63.5
RWT	9.0	—
Coding Agent Index	62.2	—
HLE	65.0	57.4
GPQA	93.7	—
SWE-Pro	81.2	64.8
SWE-Atlas	64.8	—
Terminal-Bench	52.0	32.8
DeepSWE	67.4	—
GDPval-AA	1853.0	1620.0
Finance Agent	58.9	—
MMMU-Pro	90.6	—
ARC-AGI 2	90.0	—
Input Price (per 1M tokens)	$10.0	$0.10
Output Price (per 1M tokens)	$50.0	$0.50
Context Window	1M	1M
Benchmarks Published	15	8

Claude Fable 5.1 vs Claude Haiku 5.5 head-to-head charts

Claude Fable 5.1 leads 6 and Claude Haiku 5.5 leads 0 of 6 shared benchmarks. Claude Haiku 5.5 is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.

Claude Fable 5.1Claude Haiku 5.5

Overall

78.2Claude Fable 5.1

60.0Claude Haiku 5.5

ACB

79.2Claude Fable 5.1

63.5Claude Haiku 5.5

HLE

65.0Claude Fable 5.1

57.4Claude Haiku 5.5

SWE-Pro

81.2Claude Fable 5.1

64.8Claude Haiku 5.5

Terminal-Bench

52.0Claude Fable 5.1

32.8Claude Haiku 5.5

GDPval-AA

1853.0Claude Fable 5.1

1620.0Claude Haiku 5.5

Claude Fable 5.1

Input$10.0

Output$50.0

Workload$20

Context1M

Claude Haiku 5.5

Input$0.10

Output$0.50

Workload$0.20

Context1M

Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.

More Claude Fable 5.1 and Claude Haiku 5.5 comparisons

Explore how Claude Fable 5.1 and Claude Haiku 5.5 stack up against other top-ranked LLMs.

Claude Opus 5.5 vs Claude Fable 5.1 Claude Opus 5.5 vs Claude Haiku 5.5 Claude Fable 5.1 vs Claude Opus 5 Claude Opus 5 vs Claude Haiku 5.5 Claude Fable 5.1 vs Claude Sonnet 5.5 Claude Sonnet 5.5 vs Claude Haiku 5.5 Claude Fable 5.1 vs Claude Fable 5 Claude Fable 5 vs Claude Haiku 5.5 Claude Fable 5.1 vs GPT-6.1 Sol GPT-6.1 Sol vs Claude Haiku 5.5

How to read this comparison

Benchmark scores

Higher is better for all benchmark scores (SWE-bench, GPQA, HLE, Terminal-Bench, etc.). Green marks the model with the higher score.

Token pricing

Lower is better for input and output prices. Green marks the cheaper model per 1M tokens.

Coverage matters

Models with fewer disclosed benchmark cells may have inflated percentile scores. Check the benchmark cell count for context.

This comparison page is generated from the AskClash LLM leaderboard cache. Open the live leaderboard for real-time scores and interactive filtering.