GPT-5.1 Codex vs Claude 3.5 Haiku
Detailed comparison of capabilities, features, and performance.
Feature
GPT-5.1 Codex
Claude 3.5 Haiku
Model Image
AI Lab
OpenAI
Anthropic
Context Size
400,000 tokens
204,800 tokens
Max Output Size
128,000 tokens
4,096 tokens
Frontier Model
Yes
No
Vision Support
Yes
No
Description
A version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments.
The latest Haiku 3.5 model from Anthropic
Learn more about GPT-5.1 Codex
View detailed specifications and capabilities
View model details →Learn more about Claude 3.5 Haiku
View detailed specifications and capabilities
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