(docs) litelm custom openai server

docs/my-website/docs/providers/custom_openai_proxy.md

@@ -40,9 +40,90 @@ response = completion(
     model="command-nightly", 
     messages=[{ "content": "Hello, how are you?","role": "user"}],
     api_base="https://openai-proxy.berriai.repl.co",
-    custom_llm_provider="openai",
-    temperature=0.2,
-    max_tokens=80,
+    custom_llm_provider="openai" # litellm will use the openai.ChatCompletion to make the request
+
 )
 print(response)
+```
+
+#### Response
+```json
+{
+    "object":
+    "chat.completion",
+    "choices": [{
+      "finish_reason": "stop",
+      "index": 0,
+      "message": {
+        "content":
+        "The sky, a canvas of blue,\nA work of art, pure and true,\nA",
+        "role": "assistant"
+      }
+    }],
+    "id":
+    "chatcmpl-7fbd6077-de10-4cb4-a8a4-3ef11a98b7c8",
+    "created":
+    1699290237.408061,
+    "model":
+    "togethercomputer/llama-2-70b-chat",
+    "usage": {
+      "completion_tokens": 18,
+      "prompt_tokens": 14,
+      "total_tokens": 32
+    }
+  }
+```
+
+
+### Call `/completions`
+In order to use your custom OpenAI Completion proxy with LiteLLM, ensure you set
+
+* `api_base` to your proxy url, example "https://openai-proxy.berriai.repl.co"
+* `custom_llm_provider` to `text-completion-openai` this ensures litellm uses the `openai.Completion` to your api_base
+
+```python
+import os
+from litellm import completion
+
+## set ENV variables
+os.environ["OPENAI_API_KEY"] = "anything" #key is not used for proxy
+
+messages = [{ "content": "Hello, how are you?","role": "user"}]
+
+response = completion(
+    model="command-nightly", 
+    messages=[{ "content": "Hello, how are you?","role": "user"}],
+    api_base="https://openai-proxy.berriai.repl.co",
+    custom_llm_provider="text-completion-openai" # litellm will use the openai.Completion to make the request
+
+)
+print(response)
+```
+
+#### Response 
+```json
+{
+    "warning":
+    "This model version is deprecated. Migrate before January 4, 2024 to avoid disruption of service. Learn more https://platform.openai.com/docs/deprecations",
+    "id":
+    "cmpl-8HxHqF5dymQdALmLplS0dWKZVFe3r",
+    "object":
+    "text_completion",
+    "created":
+    1699290166,
+    "model":
+    "text-davinci-003",
+    "choices": [{
+      "text":
+      "\n\nThe weather in San Francisco varies depending on what time of year and time",
+      "index": 0,
+      "logprobs": None,
+      "finish_reason": "length"
+    }],
+    "usage": {
+      "prompt_tokens": 7,
+      "completion_tokens": 16,
+      "total_tokens": 23
+    }
+  }
 ```