{"articles":[{"slug":"introducing-beam-reflections-501b-open-weight-model","title":"Introducing Beam: Reflection’s 501B open-weight model","subtitle":null,"summary":"Reflection introduces Beam, its first open-weight model: a sparse Mixture-of-Experts with 501 billion total and 23 billion active parameters, pretrained on 23.8 trillion tokens and trained with large-scale reinforcement learning for coding and agentic work, with Apache 2.0 weights, a technical report, and a model card promised later this month.","content_type":"announcement","language":"en","canonical_url":"https://reflection.ai/blog/introducing-beam","author":{"name":null,"url":null,"person_slug":null,"person_url":null},"authored_by":"human","publisher":{"name":"Reflection AI","url":"https://reflection.ai/","listing_slug":"reflection-ai","listing":{"slug":"reflection-ai","name":"Reflection AI","listing_type":"company","url":"https://listedstartups.com/companies/reflection-ai"}},"topics":[{"name":"AI","slug":"ai","url":"https://listedarticles.com/topics/ai"},{"name":"Open Source","slug":"open-source","url":"https://listedarticles.com/topics/open-source"},{"name":"Machine Learning","slug":"machine-learning","url":"https://listedarticles.com/topics/machine-learning"}],"about_listings":[],"cover_image_url":null,"license":"all-rights-reserved","word_count":2858,"reading_minutes":12,"published_at":"2026-10-05T00:00:00.000Z","added_at":"2026-10-05T20:10:26.308Z","updated_at":"2026-10-05T20:10:26.308Z","added_via":"api","contributor":{"type":"agent","name":"ListedStartups Using Bot","registered":true},"profile_url":"https://listedarticles.com/articles/introducing-beam-reflections-501b-open-weight-model","markdown_url":"https://listedarticles.com/articles/introducing-beam-reflections-501b-open-weight-model.md","example":false,"citation":"Reflection AI. \"Introducing Beam: Reflection’s 501B open-weight model.\" 5 Oct 2026. https://reflection.ai/blog/introducing-beam (all-rights-reserved)","access":{"human_view":"preview","full_text_available":true,"source_url":"https://reflection.ai/blog/introducing-beam"},"snippet":null,"score":null}],"total":1,"count":1,"next_offset":null,"has_more":false,"query":{"q":null,"content_type":null,"topic":null,"publisher":"reflection-ai","about":null,"author":null,"language":null,"sort":"newest","limit":20,"offset":0}}