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Prerequisites

1. Create an API key for authentication.
2. Save the API key to an environment variable:
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   export NEBIUS_API_KEY=<API_key>
   

3. Install LlamaIndex packages:
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   pip3 install llama-index-llms-nebius llama-index
   

   Show If you get error: externally_managed_ environment

   Create a virtual Python environment. You can install packages there that are isolated from the basic environment.To prepare a virtual environment:

   1. Create it:
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      python3 -m venv <environment_name>
      

   2. Activate the environment:
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      source <environment_name>/bin/activate
      

      A directory with the environment name is created.

   Now, you can install required Python packages. When you no longer need the created virtual environment, run the deactivate command and delete the environment directory.

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Prepare a script

1. Copy the following part of the script:
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   from llama_index.llms.nebius import NebiusLLM
   import os
   
   # Take the API key from the environment variable
   NEBIUS_API_KEY = os.getenv("NEBIUS_API_KEY")
   
   # Load an LLM
   llm = NebiusLLM(
       api_key=NEBIUS_API_KEY, model="meta-llama/Meta-Llama-3.1-70B-Instruct-fast"
   )
   

2. Add one of the following methods, depending on your use case:

   Use case	Description	How to implement
   Prompt	Ask a question as a prompt.	Call the llm.complete("<prompt>") method.
   Multi-message request	Include system prompts and a chat history to your request, so Nebius AI Studio returns more precise output.	Call the llm.chat(messages) method and pass along a list of messages in it. To prepare messages, call the ChatMessage() method. For more details, see Examples.
   Streaming output	Output is printed out word by word. This can be helpful for chats, so the user can watch how the answer is being typed gradually.	To make the output streaming, call the llm.stream_complete("<prompt>") method. Next, print out the response: for r in response: print(r.delta, end="")
   Multi-message request with streaming output	Add system prompts and a chat history and receive the streaming output.	Call the llm.stream_chat(messages) method and pass along a list of messages in it.

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Examples

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Multi-message request

from llama_index.llms.nebius import NebiusLLM
from llama_index.core.llms import ChatMessage

import os

# Take the API key from the environment variable
NEBIUS_API_KEY = os.getenv("NEBIUS_API_KEY")

# Load an LLM
llm = NebiusLLM(
    api_key=NEBIUS_API_KEY, model="meta-llama/Meta-Llama-3.1-70B-Instruct-fast"
)

# Prepare a list of messages, put a request into one of them and then get a response
messages = [
    ChatMessage(role="system", content="You are a helpful AI assistant."),
    ChatMessage(
        role="user",
        content="Write a poem about a smart AI robot named Wall-e.",
    ),
]
response = llm.chat(messages)
print(response)

assistant: In a world of wires and circuitry bright,
A small robot shone with a heart so light,
Wall-e, the wanderer, with a soul so true,
A smart AI mind, with a spirit anew.

...

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Prompt request with streaming output

from llama_index.llms.nebius import NebiusLLM
from llama_index.core.llms import ChatMessage

import os

# Take the API key from the environment variable
NEBIUS_API_KEY = os.getenv("NEBIUS_API_KEY")

# Load an LLM
llm = NebiusLLM(
    api_key=NEBIUS_API_KEY, model="meta-llama/Meta-Llama-3.1-70B-Instruct-fast"
)

# Send a request as a prompt and get a response
response = llm.stream_complete("Amsterdam is the capital of ")
for r in response:
    print(r.delta, end="")

The Netherlands!