GPT-5.6 Soul and Claude Fable 5 compared for agentic workflows

The comparison evaluates GPT-5.6 Soul, a mid-cycle release emphasizing consistency and tool-calling, against Claude Fable 5 for multi-step agent tasks. The analysis covers structured output generation, multi-tool orchestration, and instruction following. Both models are top 2026 contenders with distinct strengths in reliability and error recovery.