Compare · ModelsLive · 2 picked · head to head
Claude Fable 5.1 vs Claude Opus 5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 18/22 benchmarks
Claude Opus 5.5 wins 18 of 22 shared benchmarks. Leads in speed · agentic · general.
Category leads
speed·Claude Opus 5.5agentic·Claude Opus 5.5reasoning·Claude Fable 5.1general·Claude Opus 5.5coding·Claude Opus 5.5math·Claude Opus 5.5knowledge·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Fable 5.1
#16 by perf·#12 by attention
Claude Opus 5.5
#3 by perf·#6 by attention
Best value
Claude Opus 5.5
2.9x better value than Claude Fable 5.1
Claude Fable 5.1
2.4 pts/$
$30.00/M
Claude Opus 5.5
6.9 pts/$
$12.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
22 benchmarks · 2 models
Claude Fable 5.1Claude Opus 5.5
Artificial Analysis · CritPt
Claude Opus 5.5 leads by +2.0
Claude Fable 5.1
29.7
Claude Opus 5.5
31.7
Artificial Analysis · GDPval
Claude Opus 5.5 leads by +5.6
Claude Fable 5.1
61.7
Claude Opus 5.5
67.3
Artificial Analysis · Humanity's Last Exam
Claude Opus 5.5 leads by +2.3
Claude Fable 5.1
59.1
Claude Opus 5.5
61.4
Artificial Analysis · Long Context Reasoning
Claude Fable 5.1 leads by +0.6
Claude Fable 5.1
85.3
Claude Opus 5.5
84.7
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +4.3
Claude Fable 5.1
53.4
Claude Opus 5.5
57.6
Artificial Analysis · SciCode
Claude Opus 5.5 leads by +3.8
Claude Fable 5.1
63.1
Claude Opus 5.5
66.9
APEX-Agents
Claude Opus 5.5 leads by +4.9
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Fable 5.1
68.6
Claude Opus 5.5
73.5
ARC-AGI
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Fable 5.1
97.5
Claude Opus 5.5
97.5
ARC-AGI-2
Claude Opus 5.5 leads by +2.5
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Claude Fable 5.1
90.0
Claude Opus 5.5
92.5
Dtbench
Claude Opus 5.5 leads by +2.2
Claude Fable 5.1
96.0
Claude Opus 5.5
98.2
Ebr Bench
Claude Opus 5.5 leads by +14.3
Claude Fable 5.1
57.1
Claude Opus 5.5
71.4
Frontiercode
Claude Opus 5.5 leads by +3.7
Claude Fable 5.1
50.9
Claude Opus 5.5
54.6
FrontierMath-Tier-4-v2-Private
Claude Opus 5.5 leads by +7.2
Claude Fable 5.1
87.8
Claude Opus 5.5
95.0
FrontierMath-Tiers-1-3-v2-Private
Claude Opus 5.5 leads by +1.0
Claude Fable 5.1
90.2
Claude Opus 5.5
91.2
Frontierswe
Claude Opus 5.5 leads by +6.0
Claude Fable 5.1
56.3
Claude Opus 5.5
62.3
Furniture Assembly
Claude Opus 5.5 leads by +19.0
Claude Fable 5.1
57.1
Claude Opus 5.5
76.2
Lmca
Claude Opus 5.5 leads by +3.3
Claude Fable 5.1
77.0
Claude Opus 5.5
80.3
Mirrorcode
Claude Opus 5.5 leads by +4.1
Claude Fable 5.1
73.3
Claude Opus 5.5
77.4
Mystery Game Puzzles
Claude Opus 5.5 leads by +14.3
Claude Fable 5.1
53.7
Claude Opus 5.5
68.0
OTIS Mock AIME 2024-2025
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Fable 5.1
100.0
Claude Opus 5.5
100.0
Proofbench
Claude Fable 5.1
100.0
Claude Opus 5.5
100.0
SimpleQA Verified
Claude Opus 5.5 leads by +1.4
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Fable 5.1
70.8
Claude Opus 5.5
72.2
Full benchmark table
| Benchmark | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
Artificial Analysis · CritPt | 29.7 | 31.7 |
Artificial Analysis · GDPval | 61.7 | 67.3 |
Artificial Analysis · Humanity's Last Exam | 59.1 | 61.4 |
Artificial Analysis · Long Context Reasoning | 85.3 | 84.7 |
Artificial Analysis · Quality Index | 53.4 | 57.6 |
Artificial Analysis · SciCode | 63.1 | 66.9 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 68.6 | 73.5 |
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 97.5 | 97.5 |
ARC-AGI-2 ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data. | 90.0 | 92.5 |
Dtbench | 96.0 | 98.2 |
Ebr Bench | 57.1 | 71.4 |
Frontiercode | 50.9 | 54.6 |
FrontierMath-Tier-4-v2-Private | 87.8 | 95.0 |
FrontierMath-Tiers-1-3-v2-Private | 90.2 | 91.2 |
Frontierswe | 56.3 | 62.3 |
Furniture Assembly | 57.1 | 76.2 |
Lmca | 77.0 | 80.3 |
Mirrorcode | 73.3 | 77.4 |
Mystery Game Puzzles | 53.7 | 68.0 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 100.0 | 100.0 |
Proofbench | 100.0 | 100.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 70.8 | 72.2 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $10.00 | $50.00 | 1.0M tokens (~500 books) | $200.00 | |
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 |