Grok-4 Fast Reasoning vs Llama 4 Scout
Comparing Grok-4 Fast Reasoning and Llama 4 Scout across benchmarks, pricing, and capabilities.
xAI · Meta · Updated for 2026
Which is better?
Grok-4 Fast Reasoning and Llama 4 Scout trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Llama 4 Scout is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Llama 4 Scout also accepts a larger context window (10,000,000 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 Grok-4 Fast Reasoning
- you want the most recent training data — it shipped Aug 2025
Choose Llama 4 Scout
- cost matters — it's about 2.0x cheaper per token
- you process long inputs — it offers a 10,000,000 token context window
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
0 reported for Grok-4 Fast Reasoning · 12 for Llama 4 Scout
Grok-4 Fast Reasoning and Llama 4 Scoutdon'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, Grok-4 Fast Reasoning ($0.20/1M tokens) is 2.5x more expensive than Llama 4 Scout ($0.08/1M tokens).
For output processing, Grok-4 Fast Reasoning ($0.50/1M tokens) is 1.7x more expensive than Llama 4 Scout ($0.30/1M tokens).
In conclusion, Grok-4 Fast Reasoning is more expensive than Llama 4 Scout.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Llama 4 Scout accepts 10,000,000 input tokens compared to Grok-4 Fast Reasoning's 2,000,000 tokens. Llama 4 Scout can generate longer responses up to 10,000,000 tokens, while Grok-4 Fast Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Grok-4 Fast Reasoning and Llama 4 Scout support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4 Fast Reasoning
Llama 4 Scout
License
Usage and distribution terms
Grok-4 Fast Reasoning is licensed under a proprietary license, while Llama 4 Scout uses Llama 4 Community License Agreement.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Llama 4 Community License Agreement
Open weights
Release Timeline
When each model was launched
Grok-4 Fast Reasoning was released on 2025-08-28, while Llama 4 Scout was released on 2025-04-05.
Grok-4 Fast Reasoning is 5 months newer than Llama 4 Scout.
Aug 28, 2025
1.0 years ago
4mo newerApr 5, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Grok-4 Fast Reasoning is available from xAI. Llama 4 Scout is available from DeepInfra, Lambda, Novita, Groq, Fireworks, Together.
Grok-4 Fast Reasoning
Llama 4 Scout
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Fast Reasoning and Llama 4 Scout side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Fast Reasoning vs Llama 4 Scout.