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Gemini 4 Carbon vs Grok 4 Fast

Gemini 4 Carbon leads the LLM Stats Score 59.0 to 30.9.

Google · xAI · Updated for 2026

Which is better?

Gemini 4 Carbon leads the overall LLM Stats Score 59.0 to 30.9, ranking #2 overall.

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

Choose Gemini 4 Carbon

  • overall performance matters — it scores 59.0 and ranks #2 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Oct 2026

Choose Grok 4 Fast

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

At a glance

The differences that matter most.

Gemini 4 Carbon
Google
Grok 4 Fast
xAI
Core performance indexes
LLM Stats Score
59.0
#2
30.9
#140
Reasoning
54.9
#5
30.0
#146
Coding
48.1
#3
18.0
#140
Agents
46.0
#2
2.1
#199
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$0.20 / M
Output price
— / M
$0.50 / M
Context window
—
2,000,000

Individual benchmarks

16 reported for Gemini 4 Carbon · 7 for Grok 4 Fast

No common benchmarks found

Gemini 4 Carbon and Grok 4 Fastdon'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 specifies input context (2,000,000 tokens). Only Grok 4 Fast specifies output context (30,000 tokens).

Google
Gemini 4 Carbon
Input- tokens
Output- tokens
xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Fri Oct 30 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 4 Carbon and Grok 4 Fast support multimodal inputs.

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

Gemini 4 Carbon

Text
Images
Audio
Video

Grok 4 Fast

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 Carbon

Proprietary

Closed source

Grok 4 Fast

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Carbon was released on 2026-10-28, while Grok 4 Fast was released on 2025-08-28.

Gemini 4 Carbon is 14 months newer than Grok 4 Fast.

Gemini 4 Carbon

Oct 28, 2026

-3 days ago

1.2yr newer
Grok 4 Fast

Aug 28, 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.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Gemini 4 Carbon
✓ Preferred
Grok 4 Fast
Open in Playground

FAQ

Common questions about Gemini 4 Carbon vs Grok 4 Fast.

Which is better, Gemini 4 Carbon or Grok 4 Fast?

Gemini 4 Carbon leads the LLM Stats Score 59.0 to 30.9. Gemini 4 Carbon is made by Google and Grok 4 Fast is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 4 Carbon compare to Grok 4 Fast in benchmarks?

Gemini 4 Carbon scores Gray Swan IPI Benchmark: 100.0%, Vending-Bench 2: 100.0%, Graphwalks BFS >128k: 96.2%, WebDev Arena: 88.4%, SEC-bench Pro: 88.2%. Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%.

What are the context window sizes for Gemini 4 Carbon and Grok 4 Fast?

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

What are the main differences between Gemini 4 Carbon and Grok 4 Fast?

Key differences include LLM Stats Score (59.0 vs 30.9). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Carbon and Grok 4 Fast?

Gemini 4 Carbon is developed by Google and Grok 4 Fast is developed by xAI.

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