Beam 1.0 501B A23B overview
Beam 1.0 501B A23B by Reflection
Beam 1.0 utilizes a sparse mixture-of-experts architecture to deliver advanced reasoning for coding and long-horizon workflows. It supports structured outputs and tool calling across a massive context window.
Beam 1.0 501B A23B specs
- Model ID
reflection/beam-1.0-501b-a23b- Developer
- Reflection
- Context window
- 1,048,576 tokens
- Max output
- 131,072 tokens
- Input
- Text
- Output
- Text
- API
- OpenAI-compatible, base URL
https://api.aimlapi.com/v1
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.
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.
Capabilities
- Reasoning
- Streaming
- Structured outputs
- Function calling
Beam 1.0 501B A23B API pricing
| Usage | Price | Unit |
|---|---|---|
| Input | $0.2645 | 1M tokens |
| Output | $1.06 | 1M tokens |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Beam 1.0 501B A23B vs other models: token prices
AI/ML API input and output rates for 5 models, per million tokens.
| Model | Input | Output |
|---|---|---|
| $0.2645 | $1.06 | |
| $0.2857 | $1.06 | |
| $0.2857 | $1.06 | |
| LFM2.5-24B-A2B | $0.1058 | $1.06 |
| Weaver (alpha) | $0.7935 | $1.06 |
How to use the Beam 1.0 501B A23B API
View docsBuild with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl '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": "Write a haiku about the ocean."
}
]
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "reflection/beam-1.0-501b-a23b",
"messages": [
{
"role": "user",
"content": "Write a haiku about the ocean."
}
]
}
response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = 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": "Write a haiku about the ocean."
}
]
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());Related articles
Beam 1.0 501B A23B FAQ
How much does Beam 1.0 501B A23B cost?
Beam 1.0 501B A23B costs $0.2645 input and $1.06 output per 1M tokens on AI/ML API, billed as you go with no subscription.
What is the context window size?
The model supports a 1M-token context window.
Does the model support tool calling?
Yes, the model includes native support for tool calling.
What architecture does this model use?
It is a sparse mixture-of-experts model with 501B total and 23B active parameters.
Can the model generate structured outputs?
Yes, structured output generation is a core capability of this model.
What is the Beam 1.0 501B A23B model ID?
Use reflection/beam-1.0-501b-a23b as the model parameter. Requests go to the OpenAI-compatible endpoint with your AI/ML API key.

