Claude Sonnet 4.5 vs Claude Opus 4 (latest)

Developers looking for a cost-effective AI model with a large context window should consider Claude Sonnet 4.5, priced at $3/M input and $15/M output tokens. On the other hand, Claude Opus 4 offers a higher pricing model at $15/M input and $75/M output tokens but with a more recent training cutoff date of March 31, 2025. Both models excel in text input, vision, function calling, and advanced reasoning, making them suitable for applications requiring complex language understanding and multimodal processing. Choose Claude Sonnet 4.5 for budget-conscious projects, while Claude Opus 4 is ideal for staying ahead with the latest advancements in AI technology.