Expired60% confidenceFactExact time
Claude uses Anthropic's proprietary Messages API, which differs from OpenAI's Chat Completions API standard.
2
Sources
60%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Cherry Studio: A Deep Dive into the Open-Source AI Productivity Tool with Unified Access to 300+ LLMs
githubCherryHQ6/6/2026
Related Claims
UnverifiedAnthropic为Claude系列模型维护了一套独立的API规范，在消息结构、工具调用格式、流式事件类型等方面与OpenAI格式存在显著差异79% similarUnverifiedBoth Anthropic's Claude series and OpenAI's API have already launched similar Prompt Caching functionality74% similarUnverifiedClaude Code expects Anthropic-style API responses in /v1/messages format, while local inference engines like vLLM provide OpenAI-compatible format at /v1/chat/completions.73% similarVerifiedOpenAI uses the Chat Completions API, Anthropic uses the Messages API, and Google uses the GenerativeAI API as their respective request/response interfaces.72% similar
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