Claude Sonnet 5 vs DeepSeek V4 Flash 0423: side-by-side summary

Claude Sonnet 5 and DeepSeek V4 Flash 0423 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Sonnet 5, from Anthropic, has a 1,000,000-token context window and is priced at $2/M tokens input, $10/M tokens output on OpenRouter.

DeepSeek V4 Flash 0423, from DeepSeek, has a 1,048,576-token context window and is priced at $0.0679/M tokens input, $0.168/M tokens output on OpenRouter.

Context window

• Claude Sonnet 5: 1,000,000 tokens
• DeepSeek V4 Flash 0423: 1,048,576 tokens

Price

• Claude Sonnet 5: $2/M tokens input, $10/M tokens output
• DeepSeek V4 Flash 0423: $0.0679/M tokens input, $0.168/M tokens output

Provided by

• Claude Sonnet 5: Anthropic
• DeepSeek V4 Flash 0423: DeepSeek

• Claude Sonnet 5 model details, providers and pricing
• DeepSeek V4 Flash 0423 model details, providers and pricing