Benchmark resultEfficiency & Inference · MLOps, Tooling & Infrastructure · Large Language Models1 source · Oct 6, 2026

[AINews] Reflection Beam - 501B-A23B American Open Model

It’s been over a year since Reflection launched with us with big goals on coding (and hinted about their RL approach):

But they stayed “stealth” longer than Thinking Machines and it was not clear we would ever get a model launch out of them, as the broader open model ecosystem did not slow down one bigt for them.
They compare themselves to Inkling, Nemotron, and GLM 5.2, but the SOTA GLM 5.3, Kimi K3, Qwen 3.8 Max, and DeepSeek V4.1 Flash are generally ahead.
Still, since this is US-trained from scratch, there’s a segment of the market that has been eagerly waiting for more options here, and more importantly, Reflection has now announced its arrival as a functional neolab!
Beam launch: Reflection announced Beam, a text-only 501B-total / 23B-active MoE for coding, agentic and scientific work.

[1][AINews] Reflection Beam - 501B-A23B American Open Model
Latent Space · Oct 6, 06:28 AM
It’s been over a year since Reflection launched with us with big goals on coding (and hinted about their RL approach):
But they stayed “stealth” longer than Thinking Machines and it was not clear we would ever get a model launch out of them, as the broader open model ecosystem did not slow down one bigt for them.

Extractive summary: sentences quoted from the sources.

Before this