Model Comparison

Grok-4 Fast Non-Reasoning vs o4-miniWhich is better in 2026?

Comparing Grok-4 Fast Non-Reasoning and o4-mini across benchmarks, pricing, and capabilities.

Verdict: Grok-4 Fast Non-Reasoning vs o4-mini — which is better?

Grok-4 Fast Non-Reasoning (by xAI) and o4-mini (by OpenAI) 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.

On price, Grok-4 Fast Non-Reasoning is roughly 7.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok-4 Fast Non-Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Grok-4 Fast Non-Reasoning if…

  • cost matters — it's about 7.0x 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

Choose o4-mini if…

  • you want predictable pricing at $1.10/M input and $4.40/M output
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-4 Fast Non-Reasoning and o4-mini don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-4 Fast Non-Reasoning costs less

For input processing, Grok-4 Fast Non-Reasoning ($0.20/1M tokens) is 5.5x cheaper than o4-mini ($1.10/1M tokens).

For output processing, Grok-4 Fast Non-Reasoning ($0.50/1M tokens) is 8.8x cheaper than o4-mini ($4.40/1M tokens).

In conclusion, o4-mini is more expensive than Grok-4 Fast Non-Reasoning.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Jun 07 2026 • llm-stats.com
xAI
Grok-4 Fast Non-Reasoning
Input tokens$0.20
Output tokens$0.50
Best providerxAI
OpenAI
o4-mini
Input tokens$1.10
Output tokens$4.40
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok-4 Fast Non-Reasoning accepts 2,000,000 input tokens compared to o4-mini's 200,000 tokens. o4-mini can generate longer responses up to 100,000 tokens, while Grok-4 Fast Non-Reasoning is limited to 30,000 tokens.

xAI
Grok-4 Fast Non-Reasoning
Input2,000,000 tokens
Output30,000 tokens
OpenAI
o4-mini
Input200,000 tokens
Output100,000 tokens
Sun Jun 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-4 Fast Non-Reasoning and o4-mini support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok-4 Fast Non-Reasoning

Text
Images
Audio
Video

o4-mini

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok-4 Fast Non-Reasoning

Proprietary

Closed source

o4-mini

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-4 Fast Non-Reasoning was released on 2025-08-28, while o4-mini was released on 2025-04-16.

Grok-4 Fast Non-Reasoning is 4 months newer than o4-mini.

Grok-4 Fast Non-Reasoning

Aug 28, 2025

9 months ago

4mo newer
o4-mini

Apr 16, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

o4-mini has a documented knowledge cutoff of 2024-05-31, while Grok-4 Fast Non-Reasoning's cutoff date is not specified.

We can confirm o4-mini's training data extends to 2024-05-31, but cannot make a direct comparison without Grok-4 Fast Non-Reasoning's cutoff date.

Grok-4 Fast Non-Reasoning

—

o4-mini

May 2024

Provider Availability

Grok-4 Fast Non-Reasoning is available from xAI. o4-mini is available from OpenAI.

Grok-4 Fast Non-Reasoning

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M

o4-mini

openai logo
OpenAI
Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (2,000,000 tokens)
Less expensive input tokens
Less expensive output tokens
OpenAI

No standout differentiators in the data we have for this pair.

xAIGrok-4 Fast Non-Reasoning
OpenAIo4-mini
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-4 Fast Non-Reasoning
OpenAI
o4-mini

FAQ

Common questions about Grok-4 Fast Non-Reasoning vs o4-mini.

Which is better, Grok-4 Fast Non-Reasoning or o4-mini?

Grok-4 Fast Non-Reasoning (xAI) and o4-mini (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Grok-4 Fast Non-Reasoning compare to o4-mini in benchmarks?

o4-mini scores AIME 2024: 93.4%, AIME 2025: 92.7%, MathVista: 84.3%, MMMU: 81.6%, GPQA: 81.4%.

Is Grok-4 Fast Non-Reasoning cheaper than o4-mini?

Grok-4 Fast Non-Reasoning is 5.5x cheaper for input tokens. Grok-4 Fast Non-Reasoning costs $0.20/M input and $0.50/M output via xai. o4-mini costs $1.10/M input and $4.40/M output via openai.

What are the context window sizes for Grok-4 Fast Non-Reasoning and o4-mini?

Grok-4 Fast Non-Reasoning supports 2.0M tokens and o4-mini supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-4 Fast Non-Reasoning and o4-mini?

Key differences include context window (2.0M vs 200K), input pricing ($0.20 vs $1.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4 Fast Non-Reasoning and o4-mini?

Grok-4 Fast Non-Reasoning is developed by xAI and o4-mini is developed by OpenAI.

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