Gpt-4.1 is not invoking tools but with same prompt and everything gpt-4.1-mini is doing it

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So I’m working on a LangChain Agent, and for that when I’m using gpt-4.1 as LLM in Agent, the Agent is not invoking any tools, but when I keep everything(prompts, tools, etc.) same and just change the model to gpt-4.1-mini, Agent behaves as expected it invokes tools. but I want that same from gpt-4.1. Is this issue is from my side or from OpenAI’s side.

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I have encounter same issues. any update ?

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Same here. GPT-4.1 reports the tool as used but does not calls any.

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Did you find any workaround?

Same issue here. GPT-4.1 model tells the tool is being started. But does not invoke it.

GPT-4o model was working great in invoking LLM tools in my vscode-extension using copilot-chat, with the same prompts.

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No, I haven’t found a resolution for this issue. I tried migrating the agent from LangChain to LangGraph, but the same problem persists.