The AI arena is free today

Open Superagent

Gemini 4 Argon vs Grok-4 Fast Reasoning

Comparing Gemini 4 Argon and Grok-4 Fast Reasoning across benchmarks, pricing, and capabilities.

Google · xAI · Updated for 2026

Which is better?

Gemini 4 Argon and Grok-4 Fast Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 4 Argon

  • you want the most recent training data — it shipped Sep 2026

Choose Grok-4 Fast Reasoning

  • you want predictable pricing at $0.20/M input and $0.50/M output

At a glance

The differences that matter most.

Gemini 4 Argon
Google
Grok-4 Fast Reasoning
xAI
Benchmark wins
—
—
Input price
— / M
$0.20 / M
Output price
— / M
$0.50 / M
Context window
—
2,000,000

Individual benchmarks

19 reported for Gemini 4 Argon · 0 for Grok-4 Fast Reasoning

No common benchmarks found

Gemini 4 Argon 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

Context Window

Maximum input and output token capacity

Only Grok-4 Fast Reasoning specifies input context (2,000,000 tokens). Only Grok-4 Fast Reasoning specifies output context (30,000 tokens).

Google
Gemini 4 Argon
Input- tokens
Output- tokens
xAI
Grok-4 Fast Reasoning
Input2,000,000 tokens
Output30,000 tokens
Mon Oct 19 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 4 Argon and Grok-4 Fast Reasoning support multimodal inputs.

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

Gemini 4 Argon

Text
Images
Audio
Video

Grok-4 Fast Reasoning

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.

Gemini 4 Argon

Proprietary

Closed source

Grok-4 Fast Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Argon was released on 2026-09-30, while Grok-4 Fast Reasoning was released on 2025-08-28.

Gemini 4 Argon is 13 months newer than Grok-4 Fast Reasoning.

Gemini 4 Argon

Sep 30, 2026

2 weeks ago

1.1yr newer
Grok-4 Fast Reasoning

Aug 28, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 4 Argon and Grok-4 Fast Reasoning side-by-side, then vote on the output you prefer.

Gemini 4 Argon
✓ Preferred
Grok-4 Fast Reasoning
Open in Playground

FAQ

Common questions about Gemini 4 Argon vs Grok-4 Fast Reasoning.

Which is better, Gemini 4 Argon or Grok-4 Fast Reasoning?

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

How does Gemini 4 Argon compare to Grok-4 Fast Reasoning in benchmarks?

Gemini 4 Argon scores Graphwalks BFS <128k: 99.7%, Vibe Code Bench: 91.9%, LVBench: 91.7%, LABBench2: 88.8%, Graphwalks BFS >128k: 84.2%.

What are the context window sizes for Gemini 4 Argon and Grok-4 Fast Reasoning?

Gemini 4 Argon supports an unknown number of tokens and Grok-4 Fast Reasoning supports 2.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Gemini 4 Argon and Grok-4 Fast Reasoning?

Gemini 4 Argon is developed by Google and Grok-4 Fast Reasoning is developed by xAI.

Related comparisons