Beam 1.0 vs Grok-4 Fast Reasoning
Comparing Beam 1.0 and Grok-4 Fast Reasoning across benchmarks, pricing, and capabilities.
Reflection AI · xAI · Updated for 2026
Which is better?
Beam 1.0 and Grok-4 Fast Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Grok-4 Fast Reasoning is roughly 2.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4 Fast Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Beam 1.0
- you want the most recent training data — it shipped Oct 2026
- you need open weights you can self-host or fine-tune
Choose Grok-4 Fast Reasoning
- cost matters — it's about 2.2x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
At a glance
The differences that matter most.
Individual benchmarks
22 reported for Beam 1.0 · 0 for Grok-4 Fast Reasoning
Beam 1.0 and Grok-4 Fast Reasoningdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Beam 1.0 ($0.40/1M tokens) is 2.0x more expensive than Grok-4 Fast Reasoning ($0.20/1M tokens).
For output processing, Beam 1.0 ($1.20/1M tokens) is 2.4x more expensive than Grok-4 Fast Reasoning ($0.50/1M tokens).
In conclusion, Beam 1.0 is more expensive than Grok-4 Fast Reasoning.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4 Fast Reasoning accepts 2,000,000 input tokens compared to Beam 1.0's 1,048,576 tokens. Beam 1.0 can generate longer responses up to 131,072 tokens, while Grok-4 Fast Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Grok-4 Fast Reasoning supports multimodal inputs, whereas Beam 1.0 does not.
Grok-4 Fast Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.
Beam 1.0
Grok-4 Fast Reasoning
License
Usage and distribution terms
Beam 1.0 is licensed under Apache 2.0, while Grok-4 Fast Reasoning 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 Fast Reasoning was released on 2025-08-28.
Beam 1.0 is 14 months newer than Grok-4 Fast Reasoning.
Oct 16, 2026
4 days ago
1.1yr newerAug 28, 2025
1.1 years ago
Knowledge Cutoff
When training data ends
Beam 1.0 has a documented knowledge cutoff of 2026-06-30, while Grok-4 Fast Reasoning's cutoff date is not specified.
We can confirm Beam 1.0's training data extends to 2026-06-30, but cannot make a direct comparison without Grok-4 Fast Reasoning's cutoff date.
Jun 2026
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Provider Availability
Beam 1.0 is available from Together, Reflection AI. Grok-4 Fast Reasoning is available from xAI.
Beam 1.0
Grok-4 Fast Reasoning
Outputs Comparison
Judge for yourself.
Run your own prompts against Beam 1.0 and Grok-4 Fast Reasoning side-by-side, then vote on the output you prefer.
FAQ
Common questions about Beam 1.0 vs Grok-4 Fast Reasoning.