Claude 4.5 Sonnet vs o1

Detailed comparison of capabilities, features, and performance.

Claude 4.5 Sonnet

Claude 4.5 Sonnet

Anthropic
VS
o1

o1

OpenAI
Feature Claude 4.5 Sonnet o1
AI Lab Anthropic OpenAI
Context Size 1,000,000 tokens 128,000 tokens
Max Output Size 64,000 tokens 100,000 tokens
Frontier Model Yes Yes
Vision Support Yes No
Description The latest Claude 4.5 Sonnet model from Anthropic with a 1M token context window. o1 is OpenAI's new reasoning model for complex tasks that require broad general knowledge

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