Compare · ModelsLive · 2 picked · head to head
Claude Fable 5 vs GPT-5.6 Terra
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Fable 5 wins on 17/20 benchmarks
Claude Fable 5 wins 17 of 20 shared benchmarks. Leads in speed · agentic · reasoning.
Category leads
speed·Claude Fable 5agentic·Claude Fable 5reasoning·Claude Fable 5knowledge·GPT-5.6 Terracoding·Claude Fable 5general·Claude Fable 5math·Claude Fable 5
Hype vs Reality
Attention vs performance
Claude Fable 5
#27 by perf·#12 by attention
GPT-5.6 Terra
#29 by perf·#4 by attention
Best value
GPT-5.6 Terra
4.2x better value than Claude Fable 5
Claude Fable 5
2.3 pts/$
$30.00/M
GPT-5.6 Terra
9.5 pts/$
$7.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
20 benchmarks · 2 models
Claude Fable 5GPT-5.6 Terra
Artificial Analysis · Quality Index
Claude Fable 5 leads by +17.8
Claude Fable 5
59.9
GPT-5.6 Terra
42.1
APEX-Agents
Claude Fable 5 leads by +5.4
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Fable 5
63.6
GPT-5.6 Terra
58.2
ARC-AGI
Claude Fable 5 leads by +2.0
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Fable 5
98.5
GPT-5.6 Terra
96.5
ARC-AGI-2
Claude Fable 5 leads by +5.3
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
89.2
GPT-5.6 Terra
83.9
Chess Puzzles
GPT-5.6 Terra leads by +13.7
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
Claude Fable 5
37.9
GPT-5.6 Terra
51.6
Deepswe
Claude Fable 5 leads by +0.3
Claude Fable 5
69.9
GPT-5.6 Terra
69.6
Dtbench
Claude Fable 5 leads by +8.5
Claude Fable 5
97.3
GPT-5.6 Terra
88.9
Frontiercode
Claude Fable 5 leads by +12.2
Claude Fable 5
53.5
GPT-5.6 Terra
41.3
FrontierMath-Tier-4-v2-Private
Claude Fable 5 leads by +19.5
Claude Fable 5
90.2
GPT-5.6 Terra
70.7
FrontierMath-Tiers-1-3-v2-Private
Claude Fable 5 leads by +1.1
Claude Fable 5
87.0
GPT-5.6 Terra
86.0
Furniture Assembly
GPT-5.6 Terra leads by +26.2
Claude Fable 5
8.3
GPT-5.6 Terra
34.5
GPQA diamond
GPT-5.6 Terra leads by +9.9
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
81.1
GPT-5.6 Terra
91.1
Lmca
Claude Fable 5 leads by +7.3
Claude Fable 5
71.9
GPT-5.6 Terra
64.7
Mystery Game Puzzles
Claude Fable 5 leads by +18.7
Claude Fable 5
47.1
GPT-5.6 Terra
28.4
OTIS Mock AIME 2024-2025
Claude Fable 5 leads by +0.3
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Fable 5
100.0
GPT-5.6 Terra
99.7
Proofbench
Claude Fable 5 leads by +21.0
Claude Fable 5
95.0
GPT-5.6 Terra
74.0
SimpleBench
Claude Fable 5 leads by +39.6
SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking.
Claude Fable 5
78.3
GPT-5.6 Terra
38.7
SimpleQA Verified
Claude Fable 5 leads by +27.5
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Fable 5
70.7
GPT-5.6 Terra
43.2
Surface Evolver Bench
Claude Fable 5 leads by +11.3
Claude Fable 5
95.0
GPT-5.6 Terra
83.8
WeirdML
Claude Fable 5 leads by +13.7
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Claude Fable 5
91.9
GPT-5.6 Terra
78.3
Full benchmark table
| Benchmark | Claude Fable 5 | GPT-5.6 Terra |
|---|---|---|
Artificial Analysis · Quality Index | 59.9 | 42.1 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 63.6 | 58.2 |
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 98.5 | 96.5 |
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. | 89.2 | 83.9 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 37.9 | 51.6 |
Deepswe | 69.9 | 69.6 |
Dtbench | 97.3 | 88.9 |
Frontiercode | 53.5 | 41.3 |
FrontierMath-Tier-4-v2-Private | 90.2 | 70.7 |
FrontierMath-Tiers-1-3-v2-Private | 87.0 | 86.0 |
Furniture Assembly | 8.3 | 34.5 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 81.1 | 91.1 |
Lmca | 71.9 | 64.7 |
Mystery Game Puzzles | 47.1 | 28.4 |
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 |
Proofbench | 95.0 | 74.0 |
SimpleBench SimpleBench · tests fundamental reasoning capabilities with straightforward problems designed to expose gaps in basic logical and spatial thinking. | 78.3 | 38.7 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 70.7 | 43.2 |
Surface Evolver Bench | 95.0 | 83.8 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 91.9 | 78.3 |
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 | |
| $2.00 | $12.00 | 1.1M tokens (~525 books) | $45.00 |