GPT-4.1 mini vs Grok 4 Fast
Grok 4 Fast leads the LLM Stats Score 31.7 to 14.0. Grok 4 Fast is 2.5x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
Grok 4 Fast leads the overall LLM Stats Score 31.7 to 14.0, ranking #110 overall.
In the 4 individual benchmarks reported for both models, Grok 4 Fast wins 4; this is a narrower head-to-head signal than the composite indexes.
On price, Grok 4 Fast is roughly 2.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4 Fast 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 GPT-4.1 mini
- you want predictable pricing at $0.40/M input and $1.60/M output
Choose Grok 4 Fast
- overall performance matters — it scores 31.7 and ranks #110 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 4 of 4 exact shared results
- cost matters — it's about 2.5x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Aug 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
28 reported for GPT-4.1 mini · 7 for Grok 4 Fast
GPT-4.1 mini outperforms in 0 benchmarks, while Grok 4 Fast is better at 4 benchmarks (AIME 2025, GPQA, HMMT 2025, Humanity's Last Exam).
Grok 4 Fast significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-4.1 mini ($0.40/1M tokens) is 2.0x more expensive than Grok 4 Fast ($0.20/1M tokens).
For output processing, GPT-4.1 mini ($1.60/1M tokens) is 3.2x more expensive than Grok 4 Fast ($0.50/1M tokens).
In conclusion, GPT-4.1 mini is more expensive than Grok 4 Fast.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4 Fast accepts 2,000,000 input tokens compared to GPT-4.1 mini's 1,047,576 tokens. GPT-4.1 mini can generate longer responses up to 32,768 tokens, while Grok 4 Fast is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-4.1 mini and Grok 4 Fast support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-4.1 mini
Grok 4 Fast
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-4.1 mini was released on 2025-04-14, while Grok 4 Fast was released on 2025-08-28.
Grok 4 Fast is 5 months newer than GPT-4.1 mini.
Apr 14, 2025
1.4 years ago
Aug 28, 2025
1.1 years ago
4mo newerKnowledge Cutoff
When training data ends
GPT-4.1 mini has a documented knowledge cutoff of 2024-05-31, while Grok 4 Fast's cutoff date is not specified.
We can confirm GPT-4.1 mini's training data extends to 2024-05-31, but cannot make a direct comparison without Grok 4 Fast's cutoff date.
May 2024
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Provider Availability
GPT-4.1 mini is available from OpenAI. Grok 4 Fast is available from xAI.
GPT-4.1 mini
Grok 4 Fast
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-4.1 mini and Grok 4 Fast side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-4.1 mini vs Grok 4 Fast.