Expired50% confidenceFactExact time
Claude uses the tool_use format defined by Anthropic, the GPT series uses OpenAI's function_calling protocol, and there is no unified industry standard for tool calling in large language models.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
Open-Source Models Keep Throwing Errors in Your Code? The Problem Might Be the Framework
bilibili小牛AI_XNAI6/11/2026
Related Claims
UnverifiedClaude uses the Anthropic Messages API format, while the GPT series uses the OpenAI Chat Completions format, and the two have fundamentally different interface specifications.79% similarUnverifiedOpenAI's GPT-5.6 can run in the Claude Code environment, reflecting the interoperability between models and toolchains from different vendors78% similarUnverifiedOpenAI's GPT series uses the tiktoken tokenizer, while Anthropic's Claude uses a proprietary tokenizer.78% similarUnverifiedMainstream models such as OpenAI GPT-4o and Claude 3.5 already support parallel tool calling.75% similarUnverifiedThe language models available for invocation online from OpenAI are mainly divided into four major categories: GPT-4, GPT-3.5, GPT-3, and the content moderation model Moderation.73% similar
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