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78 lines
2.2 KiB
Markdown
78 lines
2.2 KiB
Markdown
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---
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title: Use Model Aliases for Semantic, Stable Model References
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impact: MEDIUM
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impactDescription: Hardcoded model names in client code require code changes when you swap providers; aliases let you update routing in config.yaml alone
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tags: routing, model-aliases, maintainability, client-integration
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---
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## Use Model Aliases for Semantic, Stable Model References
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`model_aliases` map human-readable names to specific model identifiers. Client applications reference the alias, not the underlying model. When you want to upgrade from `gpt-4o` to a new model, you change one line in `config.yaml` — not every client calling the API.
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**Incorrect (clients hardcode specific model names):**
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```yaml
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# config.yaml — no aliases defined
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version: v0.3.0
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listeners:
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- type: model
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name: model_listener
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port: 12000
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model_providers:
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- model: openai/gpt-4o
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access_key: $OPENAI_API_KEY
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default: true
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```
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```python
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# Client code — brittle, must be updated when model changes
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client.chat.completions.create(model="gpt-4o", ...)
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```
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**Correct (semantic aliases, stable client contracts):**
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```yaml
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version: v0.3.0
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listeners:
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- type: model
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name: model_listener
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port: 12000
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model_providers:
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- model: openai/gpt-4o-mini
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access_key: $OPENAI_API_KEY
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default: true
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- model: openai/gpt-4o
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access_key: $OPENAI_API_KEY
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- model: anthropic/claude-sonnet-4-20250514
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access_key: $ANTHROPIC_API_KEY
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model_aliases:
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plano.fast.v1:
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target: gpt-4o-mini # Cheap, fast — for high-volume tasks
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plano.smart.v1:
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target: gpt-4o # High capability — for complex reasoning
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plano.creative.v1:
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target: claude-sonnet-4-20250514 # Strong creative writing and analysis
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plano.v1:
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target: gpt-4o # Default production alias
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```
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```python
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# Client code — stable, alias is the contract
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client.chat.completions.create(model="plano.smart.v1", ...)
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```
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**Alias naming conventions:**
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- `<org>.<purpose>.<version>` — e.g., `plano.fast.v1`, `acme.code.v2`
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- Bumping `.v2` → `.v3` lets you run old and new aliases simultaneously during rollouts
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- `plano.v1` as a canonical default gives clients a single stable entry point
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Reference: https://github.com/katanemo/archgw
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