Beam 1.0 501B A23B
Reflection's Apache 2.0 open-weight text model with 501.3B total and 23.4B active parameters, built for coding, reasoning and tool use. It supports a shared 1,048,576-token context window, up to 131,072 output tokens, JSON mode and structured output. Reasoning is always enabled with low, medium, high, xhigh and max effort; NanoGPT defaults to max. Knowledge cutoff: June 30, 2026.
- Reasoning
- Tool Calling
- Structured Output
Added Oct 16, 2026
Pricing
Auto routing · per 1M tokens- Input
- $1.30
- Output
- $4.30
- Cache read
- $0.13
Specifications
- Context window
- 1M
- Max output
- 131.1K
- Parameters
- 501.3B / 23.4B
- Total / active
Benchmarks
Benchmarks
Sourced from Artificial Analysis.
Intelligence Index
30.3
Document reasoning
AA-LCR (unversioned / legacy)
Legacy fallback · Long context reasoning evaluation
78.0%
Better than 79% of models compared
Reasoning
HLE
Humanity's Last Exam
34.7%
Better than 81% of models compared
Coding
SciCode
Python programming for scientific computing
48.5%
Better than 47% of models compared
Last updated Oct 16, 2026
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