> For the complete documentation index, see [llms.txt](https://docs.graphlit.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.graphlit.dev/api-guides/use-cases/specifications.md).

# Specifications

Configure LLM models, embeddings, and custom specifications for workflows and conversations.

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## Model Configuration

* [Create Custom Model](/api-guides/use-cases/specifications/specification-create-custom-model.md) - GPT-4, Claude, Gemini
* [Create OpenAI-Compatible Gateway](/api-guides/use-cases/specifications/specification-create-openai-compatible.md) - 🌐 OpenRouter, Vercel AI Gateway
* [Create Completion Spec](/api-guides/use-cases/specifications/specification-create-completion.md) - LLM configuration
* [Create Embedding Model](/api-guides/use-cases/specifications/specification-create-embedding.md) - Text embeddings config

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## Operations

* [Query Specifications](/api-guides/use-cases/specifications/specification-query.md) - List and filter
* [Update Specification](/api-guides/use-cases/specifications/specification-update.md) - Modify settings
* [Delete Specification](/api-guides/use-cases/specifications/specification-delete.md) - Remove spec

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**8 guides** | [← Back to Use Cases](/api-guides/use-cases.md)