Reflection Beam 1.0
#36 in Open-Source LLMsReflection Ai · v1.0 · since 16. Oktober 2026 · 2× · last seen Oct 18, 2026
27
Momentum
Beam 1.0 is Reflection AI's first open-weight model, a sparse mixture-of-experts architecture with 501B total and 23B active parameters per token, built for coding, reasoning and agentic tasks. The weights (BF16, FP8, NVFP4) were released under Apache 2.0 on Hugging Face on October 16, 2026; the product site is platform.reflection.ai and the developer docs are at developers.reflection.ai.
Momentum trend
21.07.19.10.
Features
| Key Benchmark (%) | SWEBench Verified: 81.6% (BF16) |
| Context Window (Tokens) | 1M tokens (model); beta API: 262,144 tokens (input+output), max. 131,072 output |
| License | Apache 2.0 |
| Multimodality | Text only (input and output) |
| Platform | Reflection API (platform.reflection.ai, public beta); weights on Hugging Face; AWS SageMaker JumpStart, Baseten, Together AI, OpenRouter |
| Release Date | October 16, 2026 (weights on Hugging Face) |