Claude 4.5 Sonnet vs GPT-5.1 thinking
Detailed comparison of capabilities, features, and performance.
Feature
Claude 4.5 Sonnet
GPT-5.1 thinking
Model Image
AI Lab
Anthropic
OpenAI
Context Size
1,000,000 tokens
400,000 tokens
Max Output Size
64,000 tokens
128,000 tokens
Frontier Model
Yes
Yes
Vision Support
Yes
Yes
Description
The latest Claude 4.5 Sonnet model from Anthropic with a 1M token context window.
OpenAI's flagship model for coding, reasoning, and agentic tasks across domains. Thinking set to maximum.
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View detailed specifications and capabilities
View model details →Learn more about GPT-5.1 thinking
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