Sierra
Sierra uses 14 subprocessors and infrastructure vendors, including AWS, Google Cloud and OpenAI, based on its public subprocessor list. Last checked Nov 10, 2026.
AI Stack
Model Serving
Foundation Models
Code Execution
Infrastructure
Cloud & Networking
AWSGlobal (localization available in United States, European Union, Southeast Asia, Japan, Australia): Data storage, cloud hosting, and AI services
Global (localization available in United States, European Union): AI services
Global, depending on user location (localization available when hosting in United States, European Union, Southeast Asia, Japan, Australia): Content Delivery Network and Edge web serving
Global (localization available in United States, European Union): AI services
Communications
Model labs reached through vendors 4
Sierra does not list these model providers. Vendors on its list name them on their own subprocessor lists.
- SpaceXAIthroughCloudflare,ElevenLabs
- Google (Gemini)throughElevenLabs
- Hugging FacethroughBaseten
- PerplexitythroughTogether AI
Named on vendor websites 6
These vendors name Sierra as a customer on their own website. They are not on Sierra’s subprocessor list.
Changes
Mar 5, 2026 to Nov 10, 2026Source
Earlier lists
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