Beam 1.0 vs Grok-4 Heavy
Beam 1.0 and Grok-4 Heavy are closely matched at 44.6 and 40.6 on the LLM Stats Score.
Reflection AI · xAI · Updated for 2026
Which is better?
Beam 1.0 and Grok-4 Heavy are closely matched on the overall LLM Stats Score at 44.6 and 40.6.
In the 3 individual benchmarks reported for both models, Beam 1.0 wins 2; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Beam 1.0
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
- you need open weights you can self-host or fine-tune
Choose Grok-4 Heavy
- you are already invested in the xAI ecosystem
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
22 reported for Beam 1.0 · 6 for Grok-4 Heavy
Beam 1.0 outperforms in 2 benchmarks (GPQA, LiveCodeBench), while Grok-4 Heavy is better at 1 benchmark (Humanity's Last Exam).
Beam 1.0 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Beam 1.0 specifies input context (1,048,576 tokens). Only Beam 1.0 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Grok-4 Heavy supports multimodal inputs, whereas Beam 1.0 does not.
Grok-4 Heavy can handle both text and other forms of data like images, making it suitable for multimodal applications.
Beam 1.0
Grok-4 Heavy
License
Usage and distribution terms
Beam 1.0 is licensed under Apache 2.0, while Grok-4 Heavy uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Apache 2.0
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Beam 1.0 was released on 2026-10-16, while Grok-4 Heavy's release date is not specified.
We can confirm Beam 1.0's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
Oct 16, 2026
3 days ago
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Knowledge Cutoff
When training data ends
Beam 1.0 has a knowledge cutoff of 2026-06-30, while Grok-4 Heavy has a cutoff of 2024-12-31.
Beam 1.0 has more recent training data (up to 2026-06-30), making it potentially better informed about events through that date compared to Grok-4 Heavy (2024-12-31).
Jun 2026
1.5 yr newerDec 2024
Outputs Comparison
Judge for yourself.
Run your own prompts against Beam 1.0 and Grok-4 Heavy side-by-side, then vote on the output you prefer.
FAQ
Common questions about Beam 1.0 vs Grok-4 Heavy.