o1 vs Claude 4.5 Haiku

Detailed comparison of capabilities, features, and performance.

o1

o1

OpenAI
VS
Claude 4.5 Haiku

Claude 4.5 Haiku

Anthropic
Feature o1 Claude 4.5 Haiku
AI Lab OpenAI Anthropic
Context Size 128,000 tokens 200,000 tokens
Max Output Size 100,000 tokens 64,000 tokens
Frontier Model Yes No
Vision Support No Yes
Description o1 is OpenAI's new reasoning model for complex tasks that require broad general knowledge The latest Claude 4.5 Haiku model from Anthropic with a 1M token context window.

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