Claude Sonnet 4.5 vs GPT-5: performance, efficiency, and pricing compared.
Blog post from Portkey
Claude Sonnet 4.5 and GPT-5 are the latest advanced AI models from Anthropic and OpenAI, respectively, released in 2025, with each designed to enhance reasoning, coding, and workflow capabilities. Claude Sonnet 4.5 excels in long-context handling, stable performance across tasks, and integration readiness, making it a reliable choice for production environments without extensive configuration. It offers memory features and maintains consistent pricing with its predecessor. In contrast, GPT-5, which is cheaper per token, provides improved multi-step reasoning, tool orchestration, and agentic workflows with a dynamic reasoning path that adjusts based on task complexity, although it may exhibit variability in speed and accuracy. Both models show strengths in different areas: Claude Sonnet 4.5 is noted for its consistency and reliability in enterprise settings, while GPT-5 stands out in tasks requiring deep reasoning and tool integration, despite requiring more configuration for optimal results. Enterprises are advised to consider using both models to leverage their respective strengths, balancing cost, performance, and reliability through a multi-provider approach.
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