Beam 1.0
Reflection AI’s first open-weight model, a 501B MoE for coding and agents.
Beam 1.0 is a sparse mixture of experts (501B total, 23B active) from Reflection AI, released under Apache 2.0 for advanced coding, reasoning and long agent tasks. It reads and writes text, mainly English, with a 1M-token context and MCP-based tool use. BF16, FP8 and NVFP4 checkpoints are on Hugging Face; Reflection also runs a hosted API.
- Provider
- Reflection AI
- Type
- Language model
- Released
- Oct 16, 2026
- Context window
- 1M tokens
- Input
- text
- Output
- text
- Open weights
- Yes
- License
- Apache 2.0
- Knowledge cutoff
- Jun 30, 2026
Best for
- Coding
- Agents
- Reasoning
- Long context
Strengths
- Open weights (Apache 2.0)
- 1M-token context
- Only 23B active parameters