Member-only story
GPT-5 Sucks at Tool Calling (6x Cheaper Alternative Inside)
It’s also open-source and more reliable
I tested three AI models on a simple tool-calling task in n8n. GPT-5, the industry’s most hyped model, needed 5 tool calls and 2.5 minutes to do what Claude and an open-source model did perfectly in 2 calls and 1/3 of the time.
The open-source model? It costs 6x less than GPT-5. We’ll reveal the name of that model at the end of the article ;)
Here’s the complete breakdown of my experiment, the results each model returned, and why this matters for anyone using AI in production workflows.
Quick note: This article was written in 2 hours using the help of my Claude Code Newsletter Assistant — the same system I’m sharing with founding members of AI ContentLab OS.
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