Reflection
Beam 1.0 501B A23B
Beam 1.0 is Reflection's open-weight reasoning model for coding and long-horizon agentic workflows. It uses a sparse mixture-of-experts architecture with 501B total and 23B active parameters per token, and a...
Cost / 1M tokens
Low usage$0.25
input
$0.05
cached input
$1.00
output
Context Window
1M
Up to 131K max output
Modalities
text → text
Other tokenizer
Quickstart & API
reflection/beam-1.0-501b-a23bBest for & Strengths
Key Strengths
Recommended Workloads in ChatOSS
- Coding agents
- Complex reasoning & debugging
- Open-source AI workflows
Verified Evaluations
Benchmarks & Frontier Comparison
How Beam 1.0 501B A23B compares against leading open-weight and proprietary frontier models across independent agentic coding and reasoning suites.
| Benchmark (Metric) | Beam 1.0 501B A23B | DeepSeek V4.1 Flash | GLM 5.3 | Kimi K3.1 Pro | Claude Opus 5.5 |
|---|---|---|---|---|---|
| Agentic & Software Engineering | |||||
| ChatOSS Agentic Coding Index (%) | — | 63.2% | 58.3% | 65% | 74.1% |
| SWE-Bench Verified (%) | — | 91.5% | 95.4% | 94.8% | 97% |
| DeepSWE v1.1 (Pass@1 %) | — | 77% | 69% | 73.5% | 74.2% |
| Vibe Code Bench v1.1 (%) | — | 87.7% | 78.1% | 88.4% | 90.3% |
| Terminal-Bench 4.0 (%) | — | 42.3% | 42% | 46.2% | 65.2% |
| Code Migration (%) | — | 45.6% | 44.2% | 52% | 66.7% |
| Intelligence & Token Economics | |||||
| Artificial Analysis Intelligence Index (0–100) | — | 39.5 | 44.8 | 55.1 | 57.6 |
| Input Price (/ 1M tokens) | $0.25 | $0.15 | $1.40 | $2.00 | $4.00 |
| Output Price (/ 1M tokens) | $1.00 | $0.60 | $4.40 | $10.00 | $20.00 |
Design Arena: Code Generation
Design Arena · Rank #56 (42.8% win)
Design Arena: Game Dev
Design Arena · Rank #52 (41.1% win)
Design Arena: WEBSITE
Design Arena · Rank #56 (43.5% win)
Active Provider Endpoints (5)
Upstream inference providers serving Beam 1.0 501B A23B, with per-provider pricing, context limits, quantization, and 24-hour uptime.
| Provider | Input / 1M | Output / 1M | Cache Read / 1M | Context | Max Output | Quantization | Uptime (24h) |
|---|---|---|---|---|---|---|---|
Nebiuscache nebius/fp4 | $0.25 | $1.00 | $0.05 | 1M | 131K | fp4 | 100.0% |
CoreWeavecache coreweave/fp4 | $0.30 | $1.00 | $0.04 | 1M | 944K | fp4 | 100.0% |
DigitalOceancache digitalocean | $0.40 | $1.20 | $0.04 | 1M | 944K | — | 100.0% |
BaseTencache baseten/fp4 | $0.40 | $1.20 | $0.04 | 1M | 131K | fp4 | 100.0% |
Togethercache together | $0.40 | $1.20 | $0.04 | 1M | 131K | — | 100.0% |
Supported API Parameters
Parameters accepted by this model when called through ChatOSS or OpenRouter.
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