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GPT-6 Rosalind vs Grok-4 Fast Non-Reasoning

Comparing GPT-6 Rosalind and Grok-4 Fast Non-Reasoning across benchmarks, pricing, and capabilities.

OpenAI · xAI · Updated for 2026

Which is better?

GPT-6 Rosalind and Grok-4 Fast Non-Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Grok-4 Fast Non-Reasoning is roughly 109.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

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

Choose GPT-6 Rosalind

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

Choose Grok-4 Fast Non-Reasoning

  • cost matters — it's about 109.1x cheaper per token

At a glance

The differences that matter most.

GPT-6 Rosalind
OpenAI
Grok-4 Fast Non-Reasoning
xAI
Benchmark wins
—
—
Input price
$15.00 / M
$0.20 / M
Output price
$75.00 / M
$0.50 / M
Context window
—
2,000,000

Individual benchmarks

0 reported for GPT-6 Rosalind · 0 for Grok-4 Fast Non-Reasoning

No common benchmarks found

GPT-6 Rosalind and Grok-4 Fast Non-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

Pricing Analysis

Price comparison per million tokens

Grok-4 Fast Non-Reasoning costs less

For input processing, GPT-6 Rosalind ($15.00/1M tokens) is 75.0x more expensive than Grok-4 Fast Non-Reasoning ($0.20/1M tokens).

For output processing, GPT-6 Rosalind ($75.00/1M tokens) is 150.0x more expensive than Grok-4 Fast Non-Reasoning ($0.50/1M tokens).

In conclusion, GPT-6 Rosalind 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
Mon Nov 09 2026 • llm-stats.com
OpenAI
GPT-6 Rosalind
Input tokens$15.00
Output tokens$75.00
Best providerOpenAI
xAI
Grok-4 Fast Non-Reasoning
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

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

OpenAI
GPT-6 Rosalind
Input- tokens
Output- tokens
xAI
Grok-4 Fast Non-Reasoning
Input2,000,000 tokens
Output30,000 tokens
Mon Nov 09 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Rosalind and Grok-4 Fast Non-Reasoning support multimodal inputs.

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

GPT-6 Rosalind

Text
Images
Audio
Video

Grok-4 Fast Non-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.

GPT-6 Rosalind

Proprietary

Closed source

Grok-4 Fast Non-Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Rosalind was released on 2026-10-30, while Grok-4 Fast Non-Reasoning was released on 2025-08-28.

GPT-6 Rosalind is 14 months newer than Grok-4 Fast Non-Reasoning.

GPT-6 Rosalind

Oct 30, 2026

1 weeks ago

1.2yr newer
Grok-4 Fast Non-Reasoning

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

Provider Availability

GPT-6 Rosalind is available from OpenAI. Grok-4 Fast Non-Reasoning is available from xAI.

GPT-6 Rosalind

openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M

Grok-4 Fast Non-Reasoning

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?

Judge for yourself.

Run your own prompts against GPT-6 Rosalind and Grok-4 Fast Non-Reasoning side-by-side, then vote on the output you prefer.

GPT-6 Rosalind
✓ Preferred
Grok-4 Fast Non-Reasoning
Open in Playground

FAQ

Common questions about GPT-6 Rosalind vs Grok-4 Fast Non-Reasoning.

Which is better, GPT-6 Rosalind or Grok-4 Fast Non-Reasoning?

GPT-6 Rosalind (OpenAI) and Grok-4 Fast Non-Reasoning (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

Is GPT-6 Rosalind cheaper than Grok-4 Fast Non-Reasoning?

Grok-4 Fast Non-Reasoning is 75.0x cheaper for input tokens. GPT-6 Rosalind costs $15.00/M input and $75.00/M output via openai. Grok-4 Fast Non-Reasoning costs $0.20/M input and $0.50/M output via xai.

What are the context window sizes for GPT-6 Rosalind and Grok-4 Fast Non-Reasoning?

GPT-6 Rosalind supports an unknown number of tokens and Grok-4 Fast Non-Reasoning 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 GPT-6 Rosalind and Grok-4 Fast Non-Reasoning?

Key differences include input pricing ($15.00 vs $0.20/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Rosalind and Grok-4 Fast Non-Reasoning?

GPT-6 Rosalind is developed by OpenAI and Grok-4 Fast Non-Reasoning is developed by xAI.

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