Anthropic flagship model with 200K context. Record ARC-AGI performance. Exceptional reasoning (98/100) and intelligence (97/100). Best for research and complex tasks.
Metrics
Performance
ECI Score149.87
Epoch Capabilities Index score
ECI Normalized96
Normalized ECI score (0-100)
Context Window200,000
Maximum input token capacity
Info
ProviderAnthropic
Organization that created the model
CountryUSA
Model development country
Model AccessibilityAPI access
Access method (API, download, etc.)
Open WeightsNo
Model weights publicly available
Open SourceNo
Open source availability
Epoch Model IDclaude-opus-4-5-20251101_32K
Epoch AI benchmark identifier
Score Breakdown
code
20%96
Code generation, understanding, and debugging
math
20%95
Mathematical reasoning and problem solving
reasoning
15%98
Multi-step logical reasoning
intelligence
30%96
Overall reasoning and task completion ability
instruction following
96
Compatibility(4)
Sources(2)
Developed by
AnthropicBenchmark Performance
Compare ModelsEpoch Capabilities Index
149.9/ 155
| Dimension | Score |
|---|---|
| Intelligence | 96.0 |
| Reasoning | 98.0 |
| Math | 95.0 |
| Code | 96.0 |
| Instruction Following | 96.0 |
| Overall | 96 |
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Data: Epoch AI (CC-BY 4.0)