REBeam 1.0 501B A23B Open vs 
Muse Spark 1.3 Contributor Paid
Beam 1.0 501B A23B vs Muse Spark 1.3 Contributor compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Muse Spark 1.3 Contributor — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$1 /M outputNo per-token fees if you self-host
$0.2 /M outputManaged API (no infra to run)
Beam 1.0 501B A23B vs Muse Spark 1.3 Contributor specs
| Spec | Beam 1.0 501B A23B | Muse Spark 1.3 Contributor | Winner |
|---|---|---|---|
| Maker | Reflection | Meta | – |
| Type | Open-weight | Proprietary | REBeam 1.0 501B A23B |
| Context window | 1M tokens | 1M tokens | = Tie |
| Input price | $0.25/M · free self-host | $0.1/M | |
| Output price | $1/M · free self-host | $0.2/M | |
| Vision / multimodal | No | Yes | |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | Yes | No (API only) | REBeam 1.0 501B A23B |
| License | Open weights | Proprietary | REBeam 1.0 501B A23B |
Price gap & when to choose each
Muse Spark 1.3 Contributor is ~5.0× cheaper than Beam 1.0 501B A23B on output tokens ($0.2 vs $1 per M tokens).
- You want to self-host or run on your cloud
- You prioritize data privacy & control
- You are building open or reproducible AI
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Beam 1.0 501B A23B | Muse Spark 1.3 Contributor |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✗ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: Beam 1.0 501B A23B vs Muse Spark 1.3 Contributor
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Beam 1.0 501B A23B and Muse Spark 1.3 Contributor score
| Criterion | Beam 1.0 501B A23B | Muse Spark 1.3 Contributor |
|---|---|---|
| Cost-efficiency | 4.5 | 5.0 |
| Context window | 5.0 | 5.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 3.5 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Beam 1.0 501B A23B Open
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...
Muse Spark 1.3 Contributor Paid
Muse Spark 1.3 Contributor is the cost-efficient contributor tier of Meta’s multimodal reasoning model for experimentation, learning, and early-stage agentic, multi-agent, and coding workflows. It is designed to track information...
Frequently asked questions
Is Beam 1.0 501B A23B as good as Muse Spark 1.3 Contributor?
Beam 1.0 501B A23B is open-weight and competitive on many tasks, but Muse Spark 1.3 Contributor may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run Beam 1.0 501B A23B locally?
Yes. Beam 1.0 501B A23B has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Muse Spark 1.3 Contributor is API-only and cannot be self-hosted.
Beam 1.0 501B A23B vs Muse Spark 1.3 Contributor — which should I pick in 2026?
Choose Beam 1.0 501B A23B if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Muse Spark 1.3 Contributor if you want frontier capability through a managed API with zero infrastructure to run.
People also compare
Explore more open-source AI
Browse the full open-source model leaderboard, thousands of tools and live benchmarks — all in one place.
Open the leaderboard →