Beam 1.0 501B A23B API

Beam 1.0 is an open-weight reasoning model by Reflection designed for coding and complex agentic workflows.

Modalities
TextText
In / Out price
$0.2645/$1.06per 1M
Context window
1.05M tokens
Released
Oct 16, 2026

Beam 1.0 501B A23B overview

The pelican test: one prompt, every text model, unedited SVG output from Nov 3, 2026.

SVG of a pelican riding a bicycle, written by Beam 1.0 501B A23B through AI/ML API

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

Beam 1.0 501B A23B pricing in US dollars
UsagePriceUnit
Input$0.26451M tokens
Output$1.061M 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.

AI/ML API model prices in USD per million tokens
ModelInputOutput
Beam 1.0 501B A23B$0.2645$1.06
DeepSeek V3.1$0.2857$1.06
DeepSeek-V3.1 Terminus$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 docs

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export 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."
    }
  ]
}'

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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.

Start building with Beam 1.0 501B A23B

Beam 1.0 501B A23B API

reflection/beam-1.0-501b-a23b

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export 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."
    }
  ]
}'