Answer · Agents & Automation
What AI models does LangChain use?
LangChain runs on Bring your own key (Any), Claude Fable 5.1 (Anthropic), GPT-5.6 Luna (OpenAI), GPT-5.6 Sol (OpenAI), GPT-5.6 Terra (OpenAI) and LLM Gateway (supports various model providers) (Provider undisclosed), and routes requests between them.
- Models used
- 6
- Primary model
- Bring your own key
- Public API
- Yes
- Last checked
- 2026-09-10
Model claims are labelled by how we know them: Bring your own key — disclosed, Claude Fable 5.1 — disclosed, GPT-5.6 Luna — disclosed, GPT-5.6 Sol — disclosed, GPT-5.6 Terra — disclosed and LLM Gateway (supports various model providers) — inferred. "Disclosed" means the vendor says so in public; "inferred" means it was derived from documentation, headers or release notes.
Context window: Depends on chosen model.
Other stack signals: ClickHouse and Redis.
Cite this answer
Tomorrow. “What AI models does LangChain use?” Tomorrow AI & Emerging Tech Index, AlienSquad, updated 2026-09-10. https://tomorrow.aliensquad.ai/q/what-models-does-langchain-use
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