Compare · ModelsLive · 2 picked · head to head
Claude Opus 5 vs Claude Fable 5.1
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Fable 5.1 wins on 12/17 benchmarks
Claude Fable 5.1 wins 12 of 17 shared benchmarks. Leads in agentic · knowledge · general.
Category leads
agentic·Claude Fable 5.1reasoning·Claude Opus 5knowledge·Claude Fable 5.1general·Claude Fable 5.1coding·Claude Fable 5.1math·Claude Fable 5.1
Hype vs Reality
Attention vs performance
Claude Opus 5
#21 by perf·#6 by attention
Claude Fable 5.1
#16 by perf·#12 by attention
Best value
Claude Opus 5
1.9x better value than Claude Fable 5.1
Claude Opus 5
4.6 pts/$
$15.00/M
Claude Fable 5.1
2.4 pts/$
$30.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
17 benchmarks · 2 models
Claude Opus 5Claude Fable 5.1
APEX-Agents
Claude Fable 5.1 leads by +2.8
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Opus 5
65.8
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
97.5
Claude Fable 5.1
97.5
ARC-AGI-2
Claude Opus 5 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 Opus 5
90.4
Claude Fable 5.1
90.0
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 Opus 5
39.0
Claude Fable 5.1
44.2
Dtbench
Claude Opus 5 leads by +0.5
Claude Opus 5
96.5
Claude Fable 5.1
96.0
Ebr Bench
Claude Fable 5.1 leads by +11.4
Claude Opus 5
45.7
Claude Fable 5.1
57.1
Frontiercode
Claude Opus 5 leads by +2.5
Claude Opus 5
53.4
Claude Fable 5.1
50.9
FrontierMath-Tier-4-v2-Private
Claude Fable 5.1 leads by +14.6
Claude Opus 5
73.2
Claude Fable 5.1
87.8
FrontierMath-Tiers-1-3-v2-Private
Claude Fable 5.1 leads by +4.6
Claude Opus 5
85.6
Claude Fable 5.1
90.2
Frontierswe
Claude Fable 5.1 leads by +4.3
Claude Opus 5
52.0
Claude Fable 5.1
56.3
Furniture Assembly
Claude Fable 5.1 leads by +13.1
Claude Opus 5
44.0
Claude Fable 5.1
57.1
Lmca
Claude Fable 5.1 leads by +1.2
Claude Opus 5
75.8
Claude Fable 5.1
77.0
Mystery Game Puzzles
Claude Opus 5 leads by +1.1
Claude Opus 5
54.8
Claude Fable 5.1
53.7
OTIS Mock AIME 2024-2025
Claude Fable 5.1 leads by +1.1
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 5
98.9
Claude Fable 5.1
100.0
Proofbench
Claude Fable 5.1 leads by +1.0
Claude Opus 5
99.0
Claude Fable 5.1
100.0
SimpleQA Verified
Claude Fable 5.1 leads by +10.9
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Opus 5
59.9
Claude Fable 5.1
70.8
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 Opus 5
91.8
Claude Fable 5.1
92.9
Full benchmark table
| Benchmark | Claude Opus 5 | Claude Fable 5.1 |
|---|---|---|
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 65.8 | 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. | 90.4 | 90.0 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 39.0 | 44.2 |
Dtbench | 96.5 | 96.0 |
Ebr Bench | 45.7 | 57.1 |
Frontiercode | 53.4 | 50.9 |
FrontierMath-Tier-4-v2-Private | 73.2 | 87.8 |
FrontierMath-Tiers-1-3-v2-Private | 85.6 | 90.2 |
Frontierswe | 52.0 | 56.3 |
Furniture Assembly | 44.0 | 57.1 |
Lmca | 75.8 | 77.0 |
Mystery Game Puzzles | 54.8 | 53.7 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 98.9 | 100.0 |
Proofbench | 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. | 59.9 | 70.8 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 91.8 | 92.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $5.00 | $25.00 | 1.0M tokens (~500 books) | $100.00 | |
| $10.00 | $50.00 | 1.0M tokens (~500 books) | $200.00 |