Verified70% confidenceFactTime unknown
GPT-4 was developed by OpenAI and Claude was developed by Anthropic, and the parameter scale of these models has reached the hundreds of billions level.
4
Sources
70%
Confidence
Long-term
Relevance
6/1/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedTool-calling capabilities were first formally introduced by OpenAI in June 2023 in the GPT-4 API, after which mainstream models including Claude and Gemini successively followed suit79% similarUnverifiedOpenAI has adopted a phased, reviewed release approach for certain capabilities of GPT-4, and Anthropic also implements invite-only access for enterprise features of Claude.79% similarVerifiedThe GPT series (OpenAI) and Claude (Anthropic) are closed-source models.77% similar
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