Compare · ModelsLive · 3 picked · head to head
Claude Fable 5.1 vs Claude Opus 5 vs Claude Opus 5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 18/25 benchmarks
Claude Opus 5.5 wins 18 of 25 shared benchmarks. Leads in agentic · general · coding.
Category leads
agentic·Claude Opus 5.5reasoning·Claude Fable 5.1general·Claude Opus 5.5coding·Claude Opus 5.5math·Claude Opus 5.5knowledge·Claude Opus 5.5speed·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Fable 5.1
#16 by perf·#12 by attention
Claude Opus 5
#21 by perf·#9 by attention
Claude Opus 5.5
#3 by perf·#9 by attention
Best value
Claude Opus 5.5
1.5x better value than Claude Opus 5
Claude Fable 5.1
2.4 pts/$
$30.00/M
Claude Opus 5
4.6 pts/$
$15.00/M
Claude Opus 5.5
6.9 pts/$
$12.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
25 benchmarks · 3 models
Claude Fable 5.1Claude Opus 5Claude Opus 5.5
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
65.8
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
97.5
Claude Opus 5.5
97.5
ARC-AGI-2
Claude Opus 5.5 leads by +2.1
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
90.4
Claude Opus 5.5
92.5
Dtbench
Claude Opus 5.5 leads by +1.8
Claude Fable 5.1
96.0
Claude Opus 5
96.5
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
45.7
Claude Opus 5.5
71.4
Frontiercode
Claude Opus 5.5 leads by +1.3
Claude Fable 5.1
50.9
Claude Opus 5
53.4
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
73.2
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
85.6
Claude Opus 5.5
91.2
Frontierswe
Claude Opus 5.5 leads by +6.0
Claude Fable 5.1
56.3
Claude Opus 5
52.0
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
44.0
Claude Opus 5.5
76.2
Lmca
Claude Opus 5.5 leads by +3.3
Claude Fable 5.1
77.0
Claude Opus 5
75.8
Claude Opus 5.5
80.3
Mystery Game Puzzles
Claude Opus 5.5 leads by +13.2
Claude Fable 5.1
53.7
Claude Opus 5
54.8
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
98.9
Claude Opus 5.5
100.0
Proofbench
Claude Fable 5.1
100.0
Claude Opus 5
99.0
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
59.9
Claude Opus 5.5
72.2
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
Chess Puzzles
Claude Fable 5.1 leads by +5.3
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Fable 5.1
44.2
Claude Opus 5
39.0
GPQA diamond
Claude Opus 5 leads by +4.4
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Opus 5
91.8
Claude Opus 5.5
87.5
Mirrorcode
Claude Opus 5.5 leads by +4.1
Claude Fable 5.1
73.3
Claude Opus 5.5
77.4
WeirdML
Claude Fable 5.1 leads by +1.1
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Claude Fable 5.1
92.9
Claude Opus 5
91.8
Full benchmark table
| Benchmark | Claude Fable 5.1 | Claude Opus 5 | 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 | 65.8 | 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 | 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 | 90.4 | 92.5 |
Dtbench | 96.0 | 96.5 | 98.2 |
Ebr Bench | 57.1 | 45.7 | 71.4 |
Frontiercode | 50.9 | 53.4 | 54.6 |
FrontierMath-Tier-4-v2-Private | 87.8 | 73.2 | 95.0 |
FrontierMath-Tiers-1-3-v2-Private | 90.2 | 85.6 | 91.2 |
Frontierswe | 56.3 | 52.0 | 62.3 |
Furniture Assembly | 57.1 | 44.0 | 76.2 |
Lmca | 77.0 | 75.8 | 80.3 |
Mystery Game Puzzles | 53.7 | 54.8 | 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 | 98.9 | 100.0 |
Proofbench | 100.0 | 99.0 | 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 | 59.9 | 72.2 |
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 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 44.2 | 39.0 | — |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | — | 91.8 | 87.5 |
Mirrorcode | 73.3 | — | 77.4 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 92.9 | 91.8 | — |
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 | |
| $5.00 | $25.00 | 1.0M tokens (~500 books) | $100.00 | |
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 |