Model Comparison
Grok 4 Fast vs Llama 4 ScoutWhich is better in 2026?
Grok 4 Fast significantly outperforms across most benchmarks. Llama 4 Scout is 2.0x cheaper per token.
Verdict: Grok 4 Fast vs Llama 4 Scout — which is better?
Grok 4 Fast (by xAI) and Llama 4 Scout (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Grok 4 Fast outperforms in 2 benchmarks (GPQA, LiveCodeBench), while Llama 4 Scout is better at 0 benchmarks. Grok 4 Fast significantly outperforms across most benchmarks.
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.
Choose Grok 4 Fast if…
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- you want the most recent training data — it shipped Aug 2025
Choose Llama 4 Scout if…
- 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
Performance Benchmarks
Comparative analysis across standard metrics
Grok 4 Fast outperforms in 2 benchmarks (GPQA, LiveCodeBench), while Llama 4 Scout is better at 0 benchmarks.
Grok 4 Fast significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4 Fast ($0.20/1M tokens) is 2.5x more expensive than Llama 4 Scout ($0.08/1M tokens).
For output processing, Grok 4 Fast ($0.50/1M tokens) is 1.7x more expensive than Llama 4 Scout ($0.30/1M tokens).
In conclusion, Grok 4 Fast 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's 2,000,000 tokens. Llama 4 Scout can generate longer responses up to 10,000,000 tokens, while Grok 4 Fast is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Grok 4 Fast and Llama 4 Scout support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok 4 Fast
Llama 4 Scout
License
Usage and distribution terms
Grok 4 Fast 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 was released on 2025-08-28, while Llama 4 Scout was released on 2025-04-05.
Grok 4 Fast is 5 months newer than Llama 4 Scout.
Aug 28, 2025
9 months ago
4mo newerApr 5, 2025
1.2 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 is available from xAI. Llama 4 Scout is available from DeepInfra, Lambda, Novita, Groq, Fireworks, Together.
Grok 4 Fast
Llama 4 Scout
Outputs Comparison
Key Takeaways
Detailed Comparison
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FAQ
Common questions about Grok 4 Fast vs Llama 4 Scout.