Claude Opus 5 (Fast) vs DeepSeek V4 Pro 0423: side-by-side summary

Claude Opus 5 (Fast) and DeepSeek V4 Pro 0423 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 5 (Fast), from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

DeepSeek V4 Pro 0423, from DeepSeek, has a 1,048,576-token context window and is priced at $0.5262/M tokens input, $1.052/M tokens output on OpenRouter.

Context window

• Claude Opus 5 (Fast): 1,000,000 tokens
• DeepSeek V4 Pro 0423: 1,048,576 tokens

Price

• Claude Opus 5 (Fast): $10/M tokens input, $50/M tokens output
• DeepSeek V4 Pro 0423: $0.5262/M tokens input, $1.052/M tokens output

Provided by

• Claude Opus 5 (Fast): Anthropic
• DeepSeek V4 Pro 0423: DeepSeek

• Claude Opus 5 (Fast) model details, providers and pricing
• DeepSeek V4 Pro 0423 model details, providers and pricing