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reflection · Active

Beam 1.0 501B A23B

beam family · launched 2026-10-05

ReasoningToolsStructuredOpen weights
AITopic score50.1Not yet ranked

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...

Evidence coverage5%1 evaluations · 1 institutions
Context / maximum output1M / 131.1ktokens
Cache / input / output$0.05 · $0.25 · $1USD per million tokens
Value / freshness62.1 / 100relative value · release freshness
Product profile

What this model supports

Inputtext
Outputtext
Knowledge cutoff2026-06-30
WeightsOpen weights
Capability profile

Strengths by domain

Coding—0 public results
Research & reasoning—0 public results
Professional work—0 public results
Knowledge & instruction—0 public results
Behind the score

Every result has a source

Raw results and standardized readings are shown together. Missing tests add neither points nor penalties.

Human preference & indices2 results

AA IndexArtificial Analysis62.27 indexReading 50.0

Imported from Artificial Analysis. The published 0–100 score is used directly; it is not z-score normalized.

Configuration: Beam 1.0 501B A23BOpen evidence
Arena TextLMArena1,425.4 EloReading 50.0

Direct LMArena text leaderboard result.

Open evidence
Same builder

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