Frontier AI APIs.
Up to 40% less.

One OpenAI-compatible endpoint for Claude, GPT, Grok, Gemini and the leading open models. Keep your SDK and change the base URL.

$1 free credit · no card needed

model

import os

from openai import OpenAI

client = OpenAI(

base_url="https://api.infer0.ai/v1", # the only change

api_key=os.environ["INFER0_API_KEY"],

)

resp = client.chat.completions.create(

model="claude-sonnet-5",

messages=[{"role": "user", "content": "Summarize this incident report."}],

)

response

{"id": "chatcmpl-8f2c41…", "object": "chat.completion",

"model": "claude-sonnet-5",

"choices": [{"message": {"role": "assistant",

"content": "• Root cause: expired TLS cert on the edge proxy…"}}],

"usage": {"prompt_tokens": 1204, "completion_tokens": 386}}

✓ 200 OK · 1,204 in / 386 out tokens

cost $0.00439 list $0.00627 −30%

Example request, priced from the rate card below.

Models & pricing

Every major lab. One price list.

Each provider's list price, struck through, next to what you pay on infer0. Same models, same API.

USD per 1M tokens

Model	Input	Output	Discount
Claude Opus 5claude-opus-5 · Anthropic	$5.00/M $3.50/M	$25.00/M $17.50/M	30% off
Claude Sonnet 5claude-sonnet-5 · Anthropic	$2.00/M $1.40/M	$10.00/M $7.00/M	30% off
Claude Fable 5.1claude-fable-5-1 · Anthropic	$10.00/M $8.00/M	$50.00/M $40.00/M	20% off
Claude Haiku 4.5claude-haiku-4-5 · Anthropic	$1.00/M $0.75/M	$5.00/M $3.75/M	25% off

List prices are each provider's standard-context rates as published on 11 Sep 2026. DeepSeek is shown at its peak rate.

How it works

If your code already calls the OpenAI API, switching to infer0 is a config change, not a rewrite.

01
Create an API key
Sign up and start with $1 of free credit. No card needed.
INFER0_API_KEY=sk-infer0-••••3f9a
02
Change your base URL
Keep your OpenAI SDK, prompts and tooling. One line of config is the whole migration.
- api.openai.com/v1
+ api.infer0.ai/v1
03
Call any frontier model
Use the model names you already know, frontier or open. One key and one invoice for every lab.
claude-sonnet-5gpt-5.6-terraglm-5.3deepseek-v4-pro

Every account starts with $1 of free credit.