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shivam 2026-03-09 15:39:27 -07:00
parent 507c772370
commit 5534f77314
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docs/my-website/docs/proxy/config_settings.md
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@ -355,7 +355,7 @@ router_settings:
| set_verbose | boolean | [DEPRECATED PARAM - see debug docs](./debugging) If true, sets the logging level to verbose. |
| retry_after | int | Time to wait before retrying a request in seconds. Defaults to 0. If `x-retry-after` is received from LLM API, this value is overridden. |
| provider_budget_config | ProviderBudgetConfig | Provider budget configuration. Use this to set llm_provider budget limits. example $100/day to OpenAI, $100/day to Azure, etc. Defaults to None. [Further Docs](./provider_budget_routing.md) |
| enable_pre_call_checks | boolean | If true, checks if a call is within the model's context window before making the call. [More information here](reliability) |
| enable_pre_call_checks | boolean | If true, checks if a call is within the model's context window before making the call. **Required** for `model_info.max_input_tokens` enforcement. Default: false. [More information here](reliability) |
| model_group_retry_policy | Dict[str, RetryPolicy] | [SDK-only arg] Set retry policy for model groups. |
| context_window_fallbacks | List[Dict[str, List[str]]] | Fallback models for context window violations. |
| redis_url | str | URL for Redis server. **Known performance issue with Redis URL.** |

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docs/my-website/docs/proxy/reliability.md
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@ -713,6 +713,34 @@ curl -X POST 'http://0.0.0.0:4000/chat/completions' \
[**See Code**](https://github.com/BerriAI/litellm/blob/c9e6b05cfb20dfb17272218e2555d6b496c47f6f/litellm/router.py#L2163)
:::important
**`enable_pre_call_checks` is required** for context-window enforcement. Without it, requests are sent to the provider regardless of input token count. Set `enable_pre_call_checks: true` in `router_settings` in your config.
:::
#### Custom max_input_tokens per deployment
You can override the default context limit for a deployment by setting `max_input_tokens` in `model_info`. This is useful for testing, rate-limiting long prompts, or enforcing stricter limits than the provider's default.
**Both** of the following are required:
1. **`router_settings.enable_pre_call_checks: true`** — enables pre-call checks
2. **`model_info.max_input_tokens`** on the deployment — overrides the limit for that model
```yaml
router_settings:
enable_pre_call_checks: true # Required for enforcement
model_list:
- model_name: gpt-4o
litellm_params:
model: openai/gpt-4o
api_key: os.environ/OPENAI_API_KEY
model_info:
max_input_tokens: 10 # Override: reject prompts > 10 tokens
```
If a request exceeds the limit, LiteLLM raises `ContextWindowExceededError` with details like `Model=gpt-4o, Max Input Tokens=10, Got=306`.
**1. Setup config**
For azure deployments, set the base model. Pick the base model from [this list](https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json), all the azure models start with azure/.