Compare · ModelsLive · 3 picked · head to head
Claude Fable 5.1 vs Claude Fable 5.2 vs Claude Opus 5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Fable 5.2 wins on 17/29 benchmarks
Claude Fable 5.2 wins 17 of 29 shared benchmarks. Leads in agentic · reasoning · knowledge.
Category leads
agentic·Claude Fable 5.2reasoning·Claude Fable 5.2knowledge·Claude Fable 5.2general·Claude Fable 5.2math·Claude Fable 5.2coding·Claude Opus 5.5speed·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Fable 5.1
#23 by perf·#5 by attention
Claude Fable 5.2
#2 by perf·#5 by attention
Claude Opus 5.5
#11 by perf·#6 by attention
Best value
Claude Opus 5.5
1.7x better value than Claude Fable 5.2
Claude Fable 5.1
2.3 pts/$
$30.00/M
Claude Fable 5.2
3.5 pts/$
$24.00/M
Claude Opus 5.5
6.2 pts/$
$12.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
29 benchmarks · 3 models
Claude Fable 5.1Claude Fable 5.2Claude Opus 5.5
APEX-Agents
Claude Fable 5.2 leads by +6.6
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 Fable 5.2
80.1
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 Fable 5.2
98.5
Claude Opus 5.5
98.5
ARC-AGI-2
Claude Fable 5.2 leads by +0.4
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 Fable 5.2
93.8
Claude Opus 5.5
93.3
Chess Puzzles
Claude Fable 5.2 leads by +12.6
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Fable 5.1
45.3
Claude Fable 5.2
77.9
Claude Opus 5.5
65.3
Dtbench
Claude Fable 5.2 leads by +0.5
Claude Fable 5.1
96.0
Claude Fable 5.2
98.7
Claude Opus 5.5
98.2
Ebr Bench
Claude Fable 5.2 leads by +19.0
Claude Fable 5.1
57.1
Claude Fable 5.2
90.5
Claude Opus 5.5
71.4
FrontierMath-Tier-4-v2-Private
Claude Fable 5.2 leads by +5.0
Claude Fable 5.1
87.8
Claude Fable 5.2
100.0
Claude Opus 5.5
95.0
FrontierMath-Tiers-1-3-v2-Private
Claude Fable 5.2 leads by +4.0
Claude Fable 5.1
94.9
Claude Fable 5.2
100.0
Claude Opus 5.5
96.0
Frontierswe
Claude Fable 5.2 leads by +7.6
Claude Fable 5.1
56.3
Claude Fable 5.2
69.9
Claude Opus 5.5
62.3
Furniture Assembly
Claude Fable 5.2 leads by +9.5
Claude Fable 5.1
57.1
Claude Fable 5.2
85.7
Claude Opus 5.5
76.2
Lmca
Claude Fable 5.2 leads by +2.8
Claude Fable 5.1
77.0
Claude Fable 5.2
83.1
Claude Opus 5.5
80.3
Mystery Game Puzzles
Claude Fable 5.2 leads by +20.9
Claude Fable 5.1
53.7
Claude Fable 5.2
89.0
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 Fable 5.2
99.7
Claude Opus 5.5
100.0
Proofbench
Claude Fable 5.1
100.0
Claude Fable 5.2
100.0
Claude Opus 5.5
100.0
Remote Labor Index
Claude Fable 5.2 leads by +20.0
Claude Fable 5.1
17.9
Claude Fable 5.2
41.3
Claude Opus 5.5
21.3
SimpleBench
Claude Fable 5.2 leads by +7.8
SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking.
Claude Fable 5.1
83.9
Claude Fable 5.2
93.9
Claude Opus 5.5
86.1
SimpleQA Verified
Claude Fable 5.2 leads by +21.8
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 Fable 5.2
94.0
Claude Opus 5.5
72.2
SpireClimb
Claude Fable 5.2 leads by +13.8
Claude Fable 5.1
2.0
Claude Fable 5.2
19.6
Claude Opus 5.5
5.8
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
62.7
Claude Opus 5.5
68.3
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
Frontiercode
Claude Opus 5.5 leads by +3.7
Claude Fable 5.1
50.9
Claude Opus 5.5
54.6
GPQA diamond
Claude Fable 5.2 leads by +4.6
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Fable 5.2
95.7
Claude Opus 5.5
91.1
Mirrorcode
Claude Opus 5.5 leads by +2.2
Claude Fable 5.1
93.3
Claude Opus 5.5
95.6
PostTrainBench
Claude Fable 5.1 leads by +0.9
Claude Fable 5.1
44.6
Claude Opus 5.5
43.8
WeirdML v3
Claude Opus 5.5 leads by +7.0
Claude Fable 5.1
48.4
Claude Opus 5.5
55.4
Full benchmark table
| Benchmark | Claude Fable 5.1 | Claude Fable 5.2 | Claude Opus 5.5 |
|---|---|---|---|
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 | 80.1 | 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 | 98.5 | 98.5 |
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 | 93.8 | 93.3 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 45.3 | 77.9 | 65.3 |
Dtbench | 96.0 | 98.7 | 98.2 |
Ebr Bench | 57.1 | 90.5 | 71.4 |
FrontierMath-Tier-4-v2-Private | 87.8 | 100.0 | 95.0 |
FrontierMath-Tiers-1-3-v2-Private | 94.9 | 100.0 | 96.0 |
Frontierswe | 56.3 | 69.9 | 62.3 |
Furniture Assembly | 57.1 | 85.7 | 76.2 |
Lmca | 77.0 | 83.1 | 80.3 |
Mystery Game Puzzles | 53.7 | 89.0 | 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 | 99.7 | 100.0 |
Proofbench | 100.0 | 100.0 | 100.0 |
Remote Labor Index | 17.9 | 41.3 | 21.3 |
SimpleBench SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking. | 83.9 | 93.9 | 86.1 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 70.8 | 94.0 | 72.2 |
SpireClimb | 2.0 | 19.6 | 5.8 |
Artificial Analysis · CritPt | 29.7 | n/a | 31.7 |
Artificial Analysis · GDPval | 62.7 | n/a | 68.3 |
Artificial Analysis · Humanity's Last Exam | 59.1 | n/a | 61.4 |
Artificial Analysis · Long Context Reasoning | 85.3 | n/a | 84.7 |
Artificial Analysis · Quality Index | 53.4 | n/a | 57.6 |
Artificial Analysis · SciCode | 63.1 | n/a | 66.9 |
Frontiercode | 50.9 | n/a | 54.6 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | n/a | 95.7 | 91.1 |
Mirrorcode | 93.3 | n/a | 95.6 |
PostTrainBench | 44.6 | n/a | 43.8 |
WeirdML v3 | 48.4 | n/a | 55.4 |
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 | |
| $8.00 | $40.00 | 1.0M tokens (~500 books) | $160.00 | |
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 |
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