Name: Beam 1.0 501B A23B API
Brand: Reflection

Overview

What Is Beam 1.0 501B A23B API?

Beam 1.0 is an open-weight reasoning model developed by Reflection. It is built to handle complex coding tasks and long-horizon agentic workflows through a sparse mixture-of-experts architecture.

The model is designed to reason before providing answers, ensuring high-quality outputs. It supports tool calling and structured data generation to integrate seamlessly into technical environments.

What Beam 1.0 501B A23B Brings to the Table

Advanced Reasoning

The model is architected to reason before answering to improve output quality.

Tool Calling

Native support for tool calling allows the model to interact with external systems.

Structured Output

The model is capable of generating structured outputs for programmatic use.

Large Context

It operates over a 1M-token context window to manage extensive information.

Use cases

Developing complex software applications through automated coding assistance.

Managing long-horizon agentic workflows that require multi-step reasoning.

Extracting and formatting data into structured outputs for downstream processing.

Interacting with external tools to execute multi-stage technical tasks.

How to use Beam 1.0 501B A23B API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to reflection/beam-1.0-501b-a23b.

import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "reflection/beam-1.0-501b-a23b",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())

const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "reflection/beam-1.0-501b-a23b",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());

curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"reflection/beam-1.0-501b-a23b","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.