Model Comparison

Grok-1.5 vs GPT-4 TurboWhich is better in 2026?

GPT-4 Turbo significantly outperforms across most benchmarks.

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

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

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

Choose Grok-1.5 if…

  • you are already invested in the xAI ecosystem

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
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

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

GPT-4 Turbo significantly outperforms across most benchmarks.

Wed Jun 10 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).

xAI
Grok-1.5
Input- tokens
Output- tokens
OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
Wed Jun 10 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.

Grok-1.5

Proprietary

Closed source

GPT-4 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Grok-1.5

Mar 28, 2024

2.2 years ago

GPT-4 Turbo

Apr 9, 2024

2.2 years ago

1w newer

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.

Grok-1.5

—

GPT-4 Turbo

Dec 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI

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

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%)

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
OpenAI
GPT-4 Turbo

FAQ

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

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

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

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

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

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

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

Who makes Grok-1.5 and GPT-4 Turbo?

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

Related comparisons