Developer Platform — Alchemax API

Build on the World’s Strongest AI Models

Integrate Alchemax-5, Alchemax-o3 Pro, and Alchemax-4.5 Flash in minutes with our 100% OpenAI-compatible REST and gRPC endpoints, deterministic structured outputs, and native tool-use SDKs.

Drop-In Compatibility

Switch in Two Lines of Code

The Alchemax API supports the exact same request and streaming schema as the OpenAI SDK for TypeScript, Python, Go, and Rust—plus native extensions for reasoning effort budgets and 2M-token context caching.

alchemax-5-2026-102M Context · Multimodal
alchemax-o3-pro1M Context · Deep Reasoning
alchemax-4.5-flash512K Context · 380 tok/s
alchemax-embed-v3Matryoshka 4096-d

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: process.env.ALCHEMAX_API_KEY,
  baseURL: 'https://api.alchemaxlabs.co.uk/v1'
});

const response = await client.chat.completions.create({
  model: 'alchemax-o3-pro',
  reasoning_effort: 'high',
  messages: [
    {
      role: 'system',
      content: 'You are a formal systems verification assistant.'
    },
    {
      role: 'user',
      content: 'Prove deadlock freedom for our consensus state machine.'
    }
  ]
});

console.log(response.choices[0].message.content);