Claude Opus 4.5

Published

Nov 24, 2025

Claude Opus 4.5 is an AI model developed by Anthropic (United States), first published in November 2025. It works in the language, multimodal and vision domain, on tasks such as code generation, language modeling/generation, quantitative reasoning and 15 more.

Epoch AI has no training-compute estimate for this model.

Access: API access. Its weights are not openly released.

Full record

Organization: Anthropic
Country of organization: United States
Domain: Language, Multimodal, Vision
Task: Code generation, Language modeling/generation, Quantitative reasoning, Search, Visual question answering, Translation, Image captioning, Instruction interpretation, Mathematical reasoning, Visual puzzles, Code autocompletion, Chat, Character recognition (OCR), Language modeling, Language generation, Text autocompletion, Retrieval-augmented generation, System control
Model accessibility: API access
Open weights: No

Benchmark results

01

Epoch Capabilities Index

ECI Score

149.6