Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs Claude Fable 5.1
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 21/22 benchmarks
Claude Opus 5.5 wins 21 of 22 shared benchmarks. Leads in speed · agentic · reasoning.
Category leads
speed·Claude Opus 5.5agentic·Claude Opus 5.5reasoning·Claude Opus 5.5general·Claude Opus 5.5coding·Claude Opus 5.5math·Claude Opus 5.5knowledge·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#6 by attention
Claude Fable 5.1
#16 by perf·#12 by attention
Best value
Claude Opus 5.5
2.9x better value than Claude Fable 5.1
Claude Opus 5.5
6.9 pts/$
$12.00/M
Claude Fable 5.1
2.4 pts/$
$30.00/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 Opus 5.5Claude Fable 5.1
Artificial Analysis · CritPt
Claude Opus 5.5 leads by +2.0
Claude Opus 5.5
31.7
Claude Fable 5.1
29.7
Artificial Analysis · GDPval
Claude Opus 5.5 leads by +5.6
Claude Opus 5.5
67.3
Claude Fable 5.1
61.7
Artificial Analysis · Humanity's Last Exam
Claude Opus 5.5 leads by +2.3
Claude Opus 5.5
61.4
Claude Fable 5.1
59.1
Artificial Analysis · Long Context Reasoning
Claude Fable 5.1 leads by +0.6
Claude Opus 5.5
84.7
Claude Fable 5.1
85.3
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +4.3
Claude Opus 5.5
57.6
Claude Fable 5.1
53.4
Artificial Analysis · SciCode
Claude Opus 5.5 leads by +3.8
Claude Opus 5.5
66.9
Claude Fable 5.1
63.1
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 Opus 5.5
73.5
Claude Fable 5.1
68.6
ARC-AGI
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Opus 5.5
97.5
Claude Fable 5.1
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 Opus 5.5
92.5
Claude Fable 5.1
90.0
Dtbench
Claude Opus 5.5 leads by +2.2
Claude Opus 5.5
98.2
Claude Fable 5.1
96.0
Ebr Bench
Claude Opus 5.5 leads by +14.3
Claude Opus 5.5
71.4
Claude Fable 5.1
57.1
Frontiercode
Claude Opus 5.5 leads by +3.7
Claude Opus 5.5
54.6
Claude Fable 5.1
50.9
FrontierMath-Tier-4-v2-Private
Claude Opus 5.5 leads by +7.2
Claude Opus 5.5
95.0
Claude Fable 5.1
87.8
FrontierMath-Tiers-1-3-v2-Private
Claude Opus 5.5 leads by +1.0
Claude Opus 5.5
91.2
Claude Fable 5.1
90.2
Frontierswe
Claude Opus 5.5 leads by +6.0
Claude Opus 5.5
62.3
Claude Fable 5.1
56.3
Furniture Assembly
Claude Opus 5.5 leads by +19.0
Claude Opus 5.5
76.2
Claude Fable 5.1
57.1
Lmca
Claude Opus 5.5 leads by +3.3
Claude Opus 5.5
80.3
Claude Fable 5.1
77.0
Mirrorcode
Claude Opus 5.5 leads by +4.1
Claude Opus 5.5
77.4
Claude Fable 5.1
73.3
Mystery Game Puzzles
Claude Opus 5.5 leads by +14.3
Claude Opus 5.5
68.0
Claude Fable 5.1
53.7
OTIS Mock AIME 2024-2025
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 5.5
100.0
Claude Fable 5.1
100.0
Proofbench
Claude Opus 5.5
100.0
Claude Fable 5.1
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 Opus 5.5
72.2
Claude Fable 5.1
70.8
Full benchmark table
| Benchmark | Claude Opus 5.5 | Claude Fable 5.1 |
|---|---|---|
Artificial Analysis · CritPt | 31.7 | 29.7 |
Artificial Analysis · GDPval | 67.3 | 61.7 |
Artificial Analysis · Humanity's Last Exam | 61.4 | 59.1 |
Artificial Analysis · Long Context Reasoning | 84.7 | 85.3 |
Artificial Analysis · Quality Index | 57.6 | 53.4 |
Artificial Analysis · SciCode | 66.9 | 63.1 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 73.5 | 68.6 |
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. | 92.5 | 90.0 |
Dtbench | 98.2 | 96.0 |
Ebr Bench | 71.4 | 57.1 |
Frontiercode | 54.6 | 50.9 |
FrontierMath-Tier-4-v2-Private | 95.0 | 87.8 |
FrontierMath-Tiers-1-3-v2-Private | 91.2 | 90.2 |
Frontierswe | 62.3 | 56.3 |
Furniture Assembly | 76.2 | 57.1 |
Lmca | 80.3 | 77.0 |
Mirrorcode | 77.4 | 73.3 |
Mystery Game Puzzles | 68.0 | 53.7 |
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. | 72.2 | 70.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $10.00 | $50.00 | 1.0M tokens (~500 books) | $200.00 |