Model Comparison

Command R+ vs Grok 4 FastWhich is better in 2026?

Comparing Command R+ and Grok 4 Fast across benchmarks, pricing, and capabilities.

Verdict: Command R+ vs Grok 4 Fast — which is better?

Command R+ (by Cohere) and Grok 4 Fast (by xAI) 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 is roughly 1.6x 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.

Choose Command R+ if…

  • you need open weights you can self-host or fine-tune

Choose Grok 4 Fast if…

  • cost matters — it's about 1.6x 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

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Command R+ and Grok 4 Fastdon'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 costs less

For input processing, Command R+ ($0.25/1M tokens) is 1.3x more expensive than Grok 4 Fast ($0.20/1M tokens).

For output processing, Command R+ ($1.00/1M tokens) is 2.0x more expensive than Grok 4 Fast ($0.50/1M tokens).

In conclusion, Command R+ is more expensive than Grok 4 Fast.*

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

Lowest available price from all providers
Mon Jul 27 2026 • llm-stats.com
Cohere
Command R+
Input tokens$0.25
Output tokens$1.00
Best providerCohere
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to Command R+'s 128,000 tokens. Command R+ can generate longer responses up to 128,000 tokens, while Grok 4 Fast is limited to 30,000 tokens.

Cohere
Command R+
Input128,000 tokens
Output128,000 tokens
xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Mon Jul 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4 Fast supports multimodal inputs, whereas Command R+ does not.

Grok 4 Fast can handle both text and other forms of data like images, making it suitable for multimodal applications.

Command R+

Text
Images
Audio
Video

Grok 4 Fast

Text
Images
Audio
Video

License

Usage and distribution terms

Command R+ is licensed under CC BY-NC, while Grok 4 Fast uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Command R+

CC BY-NC

Open weights

Grok 4 Fast

Proprietary

Closed source

Release Timeline

When each model was launched

Command R+ was released on 2024-08-30, while Grok 4 Fast was released on 2025-08-28.

Grok 4 Fast is 12 months newer than Command R+.

Command R+

Aug 30, 2024

1.9 years ago

Grok 4 Fast

Aug 28, 2025

11 months ago

12mo newer

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

Provider Availability

Command R+ is available from Cohere, Bedrock. Grok 4 Fast is available from xAI.

Command R+

cohere logo
Cohere
Input Price:Input: $0.25/1MOutput Price:Output: $1.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Cohere
Has open weights
xAI
Larger context window (2,000,000 tokens)
Supports multimodal inputs
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Command R+
✓ Preferred
Grok 4 Fast
Open in Playground
AI Model Comparison Table
Feature
Cohere
Command R+
xAI
Grok 4 Fast

FAQ

Common questions about Command R+ vs Grok 4 Fast.

Which is better, Command R+ or Grok 4 Fast?

Command R+ (Cohere) and Grok 4 Fast (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 Command R+ compare to Grok 4 Fast in benchmarks?

Command R+ scores HellaSwag: 88.6%, Winogrande: 85.4%, MMLU: 75.7%, ARC-C: 71.0%, GSM8k: 70.7%. Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%.

Is Command R+ cheaper than Grok 4 Fast?

Grok 4 Fast is 1.3x cheaper for input tokens. Command R+ costs $0.25/M input and $1.00/M output via cohere. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai.

What are the context window sizes for Command R+ and Grok 4 Fast?

Command R+ supports 128K 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 Command R+ and Grok 4 Fast?

Key differences include context window (128K vs 2.0M), input pricing ($0.25 vs $0.20/M), multimodal support (no vs yes), licensing (CC BY-NC vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Command R+ and Grok 4 Fast?

Command R+ is developed by Cohere and Grok 4 Fast is developed by xAI.

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