diff --git a/docs/my-website/docs/completion/supported.md b/docs/my-website/docs/completion/supported.md
index d0b10811d4..16e0cbe6b6 100644
--- a/docs/my-website/docs/completion/supported.md
+++ b/docs/my-website/docs/completion/supported.md
@@ -69,6 +69,16 @@ Here are some examples of supported models:
 | [google/flan-t5-xxl](https://huggingface.co/google/flan-t5-xxl)                         | `completion(model="google/flan-t5-xxl", messages=messages, custom_llm_provider="huggingface")`         | `os.environ['HF_TOKEN']`       |
 | [google/flan-t5-large](https://huggingface.co/google/flan-t5-large)                     | `completion(model="google/flan-t5-large", messages=messages, custom_llm_provider="huggingface")`       | `os.environ['HF_TOKEN']`       |
 
+### AI21 Models
+
+| Model Name       | Function Call                              | Required OS Variables                |
+|------------------|--------------------------------------------|--------------------------------------|
+| j2-light  | `completion('j2-light', messages)` | `os.environ['AI21_API_KEY']`       |
+| j2-mid  | `completion('j2-mid', messages)` | `os.environ['AI21_API_KEY']`       |
+
+| j2-ultra  | `completion('j2-ultra', messages)` | `os.environ['AI21_API_KEY']`       |
+
+
 ### Cohere Models
 
 | Model Name       | Function Call                              | Required OS Variables                |
diff --git a/litellm/__init__.py b/litellm/__init__.py
index 026afcf142..e3ce5fbec9 100644
--- a/litellm/__init__.py
+++ b/litellm/__init__.py
@@ -124,7 +124,14 @@ huggingface_models = [
     "meta-llama/Llama-2-70b-chat",
 ] # these have been tested on extensively. But by default all text2text-generation and text-generation models are supported by liteLLM. - https://docs.litellm.ai/docs/completion/supported
 
-model_list = open_ai_chat_completion_models + open_ai_text_completion_models + cohere_models + anthropic_models + replicate_models + openrouter_models + huggingface_models + vertex_chat_models + vertex_text_models
+ai21_models = [
+    "j2-ultra",
+    "j2-mid",
+    "j2-light"
+]
+
+model_list = open_ai_chat_completion_models + open_ai_text_completion_models + cohere_models + anthropic_models + replicate_models + openrouter_models + huggingface_models + vertex_chat_models + vertex_text_models + ai21_models
+
 
 ####### EMBEDDING MODELS ###################
 open_ai_embedding_models = [
diff --git a/litellm/main.py b/litellm/main.py
index d17bebd0d1..a695309efc 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -394,6 +394,29 @@ def completion(
       ## LOGGING
       logging(model=model, input=prompt, custom_llm_provider=custom_llm_provider, additional_args={"max_tokens": max_tokens, "original_response": completion_response}, logger_fn=logger_fn)
 
+      ## RESPONSE OBJECT
+      model_response["choices"][0]["message"]["content"] = completion_response
+      model_response["created"] = time.time()
+      model_response["model"] = model
+      response = model_response
+    elif model in litellm.ai21_models:
+      install_and_import("ai21")
+      import ai21
+      ai21.api_key = get_secret("AI21_API_KEY")
+
+      prompt = " ".join([message["content"] for message in messages])
+      ## LOGGING
+      logging(model=model, input=prompt, custom_llm_provider=custom_llm_provider, logger_fn=logger_fn)
+
+      ai21_response = ai21.Completion.execute(
+        model=model,
+        prompt=prompt,
+      )
+      completion_response = ai21_response['completions'][0]['data']['text']
+
+      ## LOGGING
+      logging(model=model, input=prompt, custom_llm_provider=custom_llm_provider, additional_args={"max_tokens": max_tokens, "original_response": completion_response}, logger_fn=logger_fn)
+
       ## RESPONSE OBJECT
       model_response["choices"][0]["message"]["content"] = completion_response
       model_response["created"] = time.time()
diff --git a/litellm/tests/test_completion.py b/litellm/tests/test_completion.py
index f639e327db..8cc1297f05 100644
--- a/litellm/tests/test_completion.py
+++ b/litellm/tests/test_completion.py
@@ -213,6 +213,16 @@ def test_completion_together_ai_stream():
     except Exception as e:
         pytest.fail(f"Error occurred: {e}")
 
+#### Test A121 ###################
+def test_completion_ai21():
+    model_name = "j2-light"
+    try:
+        response = completion(model=model_name, messages=messages)
+        # Add any assertions here to check the response
+        print(response)
+    except Exception as e:
+        pytest.fail(f"Error occurred: {e}")
+
 # test config file with completion # 
 # def test_completion_openai_config():
 #     try: