Model Comparison

GPT-4 Turbo vs Grok-1.5Which is better in 2026?

GPT-4 Turbo significantly outperforms across most benchmarks.

Verdict: GPT-4 Turbo vs Grok-1.5 — which is better?

GPT-4 Turbo (by OpenAI) and Grok-1.5 (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.

GPT-4 Turbo outperforms in 4 benchmarks (GPQA, HumanEval, MATH, MMLU), while Grok-1.5 is better at 0 benchmarks. GPT-4 Turbo significantly outperforms across most benchmarks.

Choose GPT-4 Turbo if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
  • you want the most recent training data — it shipped Apr 2024

Choose Grok-1.5 if…

  • you are already invested in the xAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

GPT-4 Turbo outperforms in 4 benchmarks (GPQA, HumanEval, MATH, MMLU), while Grok-1.5 is better at 0 benchmarks.

GPT-4 Turbo significantly outperforms across most benchmarks.

Sat Jul 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4 Turbo specifies input context (128,000 tokens). Only GPT-4 Turbo specifies output context (4,096 tokens).

OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-4 Turbo

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4 Turbo was released on 2024-04-09, while Grok-1.5 was released on 2024-03-28.

GPT-4 Turbo is 0 month newer than Grok-1.5.

GPT-4 Turbo

Apr 9, 2024

2.3 years ago

1w newer
Grok-1.5

Mar 28, 2024

2.3 years ago

Knowledge Cutoff

When training data ends

GPT-4 Turbo has a documented knowledge cutoff of 2023-12-31, while Grok-1.5's cutoff date is not specified.

We can confirm GPT-4 Turbo's training data extends to 2023-12-31, but cannot make a direct comparison without Grok-1.5's cutoff date.

GPT-4 Turbo

Dec 2023

Grok-1.5

—

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (128,000 tokens)
Higher GPQA score (48.0% vs 35.9%)
Higher HumanEval score (87.1% vs 74.1%)
Higher MATH score (72.6% vs 50.6%)
Higher MMLU score (86.5% vs 81.3%)
xAI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4 Turbo and Grok-1.5 side-by-side, then vote on the output you prefer.

GPT-4 Turbo
✓ Preferred
Grok-1.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4 Turbo
xAI
Grok-1.5

FAQ

Common questions about GPT-4 Turbo vs Grok-1.5.

Which is better, GPT-4 Turbo or Grok-1.5?

GPT-4 Turbo significantly outperforms across most benchmarks. GPT-4 Turbo is made by OpenAI and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4 Turbo compare to Grok-1.5 in benchmarks?

GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for GPT-4 Turbo and Grok-1.5?

GPT-4 Turbo supports 128K tokens and Grok-1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT-4 Turbo and Grok-1.5?

GPT-4 Turbo is developed by OpenAI and Grok-1.5 is developed by xAI.

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