### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

The model key replicateopenai/gpt-oss-20b in model_prices_and_context_window.json is missing the / separator between replicate and openai. Every other Replicate model entry uses the replicate/owner/model format (e.g. replicate/openai/gpt-oss-120b, replicate/openai/gpt-4o). The malformed key is invisible to the prefix-based provider routing in get_llm_provider_logic.py, so anyone calling completion(model="replicate/openai/gpt-oss-20b") gets a model-not-found error The same typo exists in litellm/model_prices_and_context_window_backup.json

### Steps to Reproduce

## Steps to reproduce

1. Load the model cost map:

```python import litellm ```

2. Verify the malformed key exists but is unreachable:

```python print("replicateopenai/gpt-oss-20b" in litellm.model_cost) # True ```

3. Verify the correctly-formatted key does not exist:

```python print("replicate/openai/gpt-oss-20b" in litellm.model_cost) # False ```

4. Compare with a working Replicate model for reference:

```python print("replicate/openai/gpt-oss-120b" in litellm.model_cost) # Tru…