Claude Sonnet 4.5 vs GPT-5: performance, efficiency, and pricing compared.

Claude Sonnet 4.5 and GPT-5, released in 2025, offer distinct advantages for different enterprise needs. Claude Sonnet 4.5 excels in reliability and consistency, delivering stable performance across coding, reasoning, and tool use while maintaining autonomous operation for up to 30 hours. GPT-5 provides superior raw power and flexibility with adaptive reasoning capabilities, though it requires more configuration and shows greater variability in results. While GPT-5 offers cheaper pricing at $1.25 per million input tokens versus Claude's $3, many enterprises are adopting multi-provider strategies to leverage each model's strengths.