Bring-your-own-LLM (BYO-LLM)
Bring-your-own-LLM (BYO-LLM) is the developer pattern where a tool or product lets users configure their own model and API key — instead of locking them into the product's bundled LLM.
BYO-LLM became a major differentiator in 2026 because users wanted control over which model their tool used and over per-token costs. Examples: Continue.dev (IDE plugin), Cline (VS Code agent), OpenRouter as the integration layer, ChatBox UI, many SillyTavern-style chat apps. Users supply their OpenAI / Anthropic / OpenRouter / local Ollama / custom endpoint. The trade-off vs bundled LLM: more setup, more user-side responsibility for cost + quality, but no vendor lock-in. Many tools split the difference by bundling a default and supporting BYO for power users.
When to use bring-your-own-llm (byo-llm)
- Tools where power users want model choice.
- OSS / privacy-focused stacks where users may use local LLMs.
Common mistakes
- Hard-coding OpenAI-only assumptions — breaks BYO promises.
- No telemetry consent — BYO users often want zero analytics.
FAQ
What is bring-your-own-llm (byo-llm)?
Bring-your-own-LLM (BYO-LLM) is the developer pattern where a tool or product lets users configure their own model and API key — instead of locking them into the product's bundled LLM.
When should I use bring-your-own-llm (byo-llm)?
Tools where power users want model choice. OSS / privacy-focused stacks where users may use local LLMs.
What are the most common mistakes with bring-your-own-llm (byo-llm)?
Hard-coding OpenAI-only assumptions — breaks BYO promises. No telemetry consent — BYO users often want zero analytics.
Related terms
- OpenRouter — OpenRouter is a unified API that lets you call 200+ language models through one endpoint with one API key — the de-facto model-router infrastructure layer in 2026.
- Local LLM — A local LLM is a language model that runs entirely on the user's own machine — laptop, desktop, or self-hosted server — rather than via a cloud API, trading some quality for privacy, offline access, and zero per-token cost.
- Model router — A model router picks which language model handles each request based on cost, latency, or task type — the standard production pattern in 2026.
Last updated: 2026-06-01. Raw markdown: https://promtable.com/glossary/bring-your-own-llm.md.