Reflection: Beam 1.0 501B A23B

reflection/beam-1.0-501b-a23b

Beam 1.0 is Reflection's open-weight reasoning model for coding and long-horizon agentic workflows. It uses a sparse mixture-of-experts architecture with 501B total and 23B active parameters per token, and a...

Modalities

In / out price

$1 / $3 per 1M

Context

1.05M

Released

Oct 16, 2026

Why use Beam 1.0 501B A23B

Step-by-step reasoning mode
Tool and function calling (agent-ready)
Structured (JSON) outputs
Very long context: whole books or codebases in one prompt

Pricing

Input	$1 / 1M tokens
Output	$3 / 1M tokens
Cached input (read)	$0.1 / 1M tokens

List prices via OpenRouter, checked daily. Real cost depends on the provider and on reasoning tokens.

Cost calculator

Pick a task, set how often you run it, and compare what it costs on each model.

TaskInput tokens≈ 602 wordsOutput tokens≈ 1,504 wordsRuns per month

Input served from cache: 0%Repeated prompts (same instructions or document) are billed at the cheaper cache-read price where the model supports it.

Model	Per run	Per month	Per 1,000 runs
Reflection: Beam 1.0 501B A23B	$0.0068	$6.80	$6.80

Estimates from list prices via OpenRouter; real bills vary by provider and reasoning tokens.

Will it fit? Context window simulator

Each square is about one page (500 words). Colored squares are your content; grey squares are free space in the model's context window.

Your content

Novel (90,000 words)

Total: about 120,000 tokens (≈ 90,226 words). Token counts are estimates.

Models

Zoom (square size): 6pxZoom out to see a whole million-token window at once.

Reflection: Beam 1.0 501B A23B

1,048,576 tokens ≈ 1,577 pages

Fits: uses 11% of the window (room for 8× this much).

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