Beam 1.0

Spec

Attribute	Value
Developer	Reflection
Released	2026-10-16
Announced	unknown
Context window	1M tokens
Pricing	unknown
License	Apache 2.0
Availability	Open weights; Reflection API public beta; partner endpoints
Release and license: (source) Context and modality: (source) The reviewed release does not state a token price; an earlier announcement date is not established by these two captures.

Release Date

Weights became available on 2026-10-16, in BF16, FP8 and NVFP4, with a speculative-decoding drafter. The model is text-only, with 501.3B total / 23.4B active parameters according to the model card. (source) (source)

Benchmarks

Reflection's final model card reports the following results. These are vendor evaluations, with temp=0.7 and top_p=0.99, not independent measurements. (source)

Row label	Beam (BF16)	Beam (FP8)	Beam (NVFP4)
DeepSWE v1.1	43.3%	43.0%	42.7%
Terminal Bench v2.1	80.1%	78.9%	78.4%
MCP Atlas	80.8%	81.5%	80.5%
The columns identify numerical formats, not reasoning-effort settings. A smaller representation does not improve every benchmark. (source)

Use Cases

Coding, tool use and long-horizon text workflows; Mirror CLI exposes tool approvals and resumable work. The release says self-distillation recipes will follow in the coming days, so that recipe publication is a promise at this capture. (source)

Compared To

Muse Spark Open is another recent open-weight release, but its license and multimodal design differ. This page does not infer a ranking across different evaluations. (source) (Meta source)

Sources

• Release announcement. (source)
• Final model card, read 2026-10-18. (source)