@axflow/models

@axflow/models

Zero-dependency module to run, stream, and render results across the most popular LLMs and embedding models.

npm i @axflow/models

Features

• Zero-dependency, lightweight package to consume all the most popular LLMs, embedding models, and more
• Built exclusively on modern web standards such as fetch and the stream APIs
• First-class streaming support with both low-level byte streams or higher-level JavaScript objects
• Supports Node 18+, Next.js serverless or edge runtime, browsers, ESM, CJS, and more
• Supports a custom fetch implementation for request middleware (e.g., custom headers, logging)

Supported models

• ✅ OpenAI and OpenAI-compatible Chat, Completion, and Embedding models
• ✅ Cohere and Cohere-compatible Generation and Embedding models
• ✅ Anthropic and Anthropic-compatible Completion models
• Google PaLM models (coming soon)
• Azure OpenAI (coming soon)
• Replicate (coming soon)
• HuggingFace (coming soon)

Basic Usage

import {OpenAIChat} from '@axflow/models/openai/chat';
import {CohereGenerate} from '@axflow/models/cohere/generate';
import {StreamToIterable} from '@axflow/models/utils';

const gpt4Stream = OpenAIChat.stream(
  {
    model: 'gpt-4',
    messages: [{ role: 'user', content: 'What is the Eiffel tower?' }],
  },
  {
    apiKey: '<openai api key>',
  },
);

const cohereStream = CohereGenerate.stream(
  {
    model: 'command-nightly',
    prompt: 'What is the Eiffel tower?',
  },
  {
    apiKey: '<cohere api key>',
  },
);

// StreamToIterable is optional in recent node versions as
// ReadableStreams already implement the async iterator protocol
for await (const chunk of StreamToIterable(gpt4Stream)) {
  console.log(chunk.choices[0].delta.content);
}

for await (const chunk of StreamToIterable(cohereStream)) {
  console.log(chunk.text);
}

Next.js edge proxy example

The server intercepts the request on the edge, adds the proper API key, and forwards the byte stream back to the client.

Note this pattern works exactly the same with our other models that support streaming, like Cohere and Anthropic.

import { NextRequest, NextResponse } from 'next/server';
import { OpenAIChat } from '@axflow/models/openai/chat';

export const runtime = 'edge'

// POST /api/openai/chat
export async function POST(request: NextRequest) {
  const chatRequest = await request.json();

  // We'll stream the bytes from OpenAI directly to the client
  const stream = await OpenAIChat.streamBytes(chatRequest, {
    apiKey: process.env.OPENAI_API_KEY!,
  });

  return new NextResponse(stream);
}

On the client, we can use OpenAIChat.stream with a custom apiUrl in place of the apiKey that points to our Next.js edge route.

DO NOT expose api keys to your frontend.

import { OpenAIChat } from '@axflow/models/openai/chat';
import { StreamToIterable } from '@axflow/models/utils';

const stream = await OpenAIChat.stream(
  {
    model: 'gpt-4',
    messages: [{ role: 'user', content: 'What is the Eiffel tower?' }],
  },
  {
    apiUrl: "/api/openai/chat",
  }
);

for await (const chunk of StreamToIterable(stream)) {
  console.log(chunk.choices[0].delta.content);
}

API

@axflow/models/openai/chat

import {OpenAIChat, OpenAIChatDecoderStream} from '@axflow/models/openai/chat';
import type {OpenAIChatTypes} from '@axflow/models/openai/chat';

OpenAIChat.run(/* args */)
OpenAIChat.stream(/* args */)
OpenAIChat.streamBytes(/* args */)

@axflow/models/openai/completion

import {OpenAICompletion, OpenAICompletionDecoderStream} from '@axflow/models/openai/completion';
import type {OpenAICompletionTypes} from '@axflow/models/openai/completion';

OpenAICompletion.run(/* args */)
OpenAICompletion.stream(/* args */)
OpenAICompletion.streamBytes(/* args */)

@axflow/models/openai/embedding

import {OpenAIEmbedding} from '@axflow/models/openai/embedding';
import type {OpenAIEmbeddingTypes} from '@axflow/models/openai/embedding';

OpenAIEmbedding.run(/* args */)

@axflow/models/cohere/generation

import {CohereGeneration, CohereGenerationDecoderStream} from '@axflow/models/cohere/generation';
import type {CohereGenerationTypes} from '@axflow/models/cohere/generation';

CohereGeneration.run(/* args */)
CohereGeneration.stream(/* args */)
CohereGeneration.streamBytes(/* args */)

@axflow/models/cohere/embedding

import {CohereEmbedding} from '@axflow/models/cohere/embedding';
import type {CohereEmbeddingTypes} from '@axflow/models/cohere/embedding';

CohereEmbedding.run(/* args */)

@axflow/models/anthropic/completion

import {AnthropicCompletion, AnthropicCompletionDecoderStream} from '@axflow/models/anthropic/completion';
import type {AnthropicCompletionTypes} from '@axflow/models/anthropic/completion';

AnthropicCompletion.run(/* args */)
AnthropicCompletion.stream(/* args */)
AnthropicCompletion.streamBytes(/* args */)

@axflow/models/utils

import {StreamToIterable, NdJsonStream, HttpError, isHttpError} from '@axflow/models/anthropic/completion';