Unveiling the Essence of LLM APIs: A Deep Dive into Six Platforms

research #llm 🏛️ Official|Analyzed: Mar 18, 2026 09:00•

Published: Mar 17, 2026 23:00

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1 min read

Analysis

This article offers a fascinating glimpse into the architecture of Generative AI development, comparing six different Large Language Model (LLM) APIs. By implementing and comparing the foundational 'Layer 1' APIs from leading providers, the author provides valuable insights into the common structures and differentiating factors in this rapidly evolving landscape.

Key Takeaways

•The article provides a structured overview of the Generative AI development ecosystem, dividing it into five layers.
•The author focuses on the foundational 'Layer 1' (Inference API) to compare and contrast six platforms: OpenAI, Claude, Gemini Developer, Bedrock, Vertex AI, and Azure OpenAI.
•The study reveals a common structure in tool-calling functionality, while conversation state management differs across the platforms.

Reference / Citation

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"From this, it became clear that, although there are minor differences between each company, the basic structure of tool calling is quite common. On the other hand, how conversations are maintained is not necessarily common."

Zenn OpenAIMar 17, 2026 23:00

* Cited for critical analysis under Article 32.

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