Beam 1.0 501B A23B

Chat Completions

beam-1.0-501b-a23b

Reflection|Created Oct 22, 2026|1.0M context

Chat Completions

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 1M-token context window.

Overview Specifications Activity Performance Uptime Examples API Reference

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Pricing-50%

Pay-as-you-go rates for this model. More details in the billing guide.

Input Tokens (1M)

$0.13

Cached Input Tokens (1M)

$0.02

Output Tokens (1M)

$0.50

Capabilities

Input Modalities

Text

Output Modalities

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Supported Parameters

Available parameters for API requests

Frequency PenaltyMax Completion TokensParallel Tool CallsPresence PenaltyResponse FormatStopTemperatureTool ChoiceToolsTop PLogit BiasLogprobs