Apertus v1.5 8B (Cloudflare Workers AI)

Apertus 1.5 is an 8B parameter language model designed to advance the state of multilingual, multimodal, fully open, and transparent AI. The models support a wide range of languages, handle contexts of up to 262,144 tokens, and it uses only fully open training data whilst delivering performance comparable to other models of similar size. For access, please fill out this form: https://forms.gle/kgvmkr6ucHN3xNuH6

Provider: All Swiss AI models | Cloudflare Workers AI

API Endpoint

https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/v1/chat/completions

Quick Start (Python)

Install: pip install openai

import os

from openai import OpenAI

account_id = os.environ["CLOUDFLARE_ACCOUNT_ID"]

client = OpenAI(
    api_key=os.environ["CLOUDFLARE_API_TOKEN"],
    base_url=f"https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/v1",
)

response = client.chat.completions.create(
    model="@cf/swiss-ai/apertus-v1.5-8b",
    messages=[
        {"role": "user", "content": "Hello, how are you?"},
    ],
    max_tokens=1024,
)

print(response.choices[0].message.content)

Additional examples: Basic invoke, REST API (any task)

Supported Parameters

Parameter	Type	Description
max_tokens	integer	Maximum tokens to generate. (≥1)
temperature	float	Controls randomness. Supported range varies by model. (≥0)
stream	boolean	Stream response chunks as they are generated. Default: false.

Feature Guides

OpenAI Compatibility

Call text generation and embedding models with OpenAI-compatible client libraries using the account-scoped Workers AI base URL.

Documentation

REST API

Run any Workers AI model, including image, speech, and embedding models, through the account-scoped /ai/run endpoint.

Documentation

Model Catalog

List available models, tasks, and per-model properties with the Workers AI models search API.

Documentation