Amazon releases Reflection Beam, an open-weight agentic coding model

Reflection Beam is available on Hugging Face under Apache 2.0, with BF16, FP8, and NVFP4 variants, 501B total parameters, 23B active parameters, and a reported million-token context. Hugging Face lists scores of 81.6 on SWE-bench Verified, 90.6 on GPQA Diamond, and 80.1 on Terminal-Bench 2.1; Artificial Analysis reportedly ranks it second among US open-weight models. Conditions and independent validation remain important follow-ups.