Model Comparison

GPT-5.4 vs Grok-4Which is better in 2026?

GPT-5.4 shows notably better performance in the majority of benchmarks. GPT-5.4 is 1.1x cheaper per token.

Verdict: GPT-5.4 vs Grok-4 — which is better?

GPT-5.4 (by OpenAI) and Grok-4 (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-5.4 outperforms in 2 benchmarks (ARC-AGI v2, GPQA), while Grok-4 is better at 1 benchmark (Humanity's Last Exam). GPT-5.4 shows notably better performance in the majority of benchmarks.

On price, GPT-5.4 is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.4 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-5.4 if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
  • cost matters — it's about 1.1x cheaper per token
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Mar 2026

Choose Grok-4 if…

  • you want predictable pricing at $3.00/M input and $15.00/M output
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

GPT-5.4 outperforms in 2 benchmarks (ARC-AGI v2, GPQA), while Grok-4 is better at 1 benchmark (Humanity's Last Exam).

GPT-5.4 shows notably better performance in the majority of benchmarks.

Sun Jun 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.4 costs less

For input processing, GPT-5.4 ($2.50/1M tokens) is 1.2x cheaper than Grok-4 ($3.00/1M tokens).

For output processing, GPT-5.4 ($15.00/1M tokens) costs the same as Grok-4 ($15.00/1M tokens).

In conclusion, Grok-4 is more expensive than GPT-5.4.*

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

Lowest available price from all providers
Sun Jun 07 2026 • llm-stats.com
OpenAI
GPT-5.4
Input tokens$2.50
Output tokens$15.00
Best providerOpenAI
xAI
Grok-4
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.4 accepts 1,000,000 input tokens compared to Grok-4's 256,000 tokens. GPT-5.4 can generate longer responses up to 128,000 tokens, while Grok-4 is limited to 8,000 tokens.

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
xAI
Grok-4
Input256,000 tokens
Output8,000 tokens
Sun Jun 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Grok-4 support multimodal inputs.

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

GPT-5.4

Text
Images
Audio
Video

Grok-4

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-5.4

Proprietary

Closed source

Grok-4

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Grok-4 was released on 2025-07-09.

GPT-5.4 is 8 months newer than Grok-4.

GPT-5.4

Mar 5, 2026

3 months ago

7mo newer
Grok-4

Jul 9, 2025

11 months ago

Knowledge Cutoff

When training data ends

Grok-4 has a documented knowledge cutoff of 2024-12-31, while GPT-5.4's cutoff date is not specified.

We can confirm Grok-4's training data extends to 2024-12-31, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

Grok-4

Dec 2024

Provider Availability

GPT-5.4 is available from OpenAI. Grok-4 is available from xAI.

GPT-5.4

openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Grok-4

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,000,000 tokens)
Less expensive input tokens
Higher ARC-AGI v2 score (73.3% vs 15.9%)
Higher GPQA score (92.8% vs 87.5%)
xAI
Higher Humanity's Last Exam score (40.0% vs 39.8%)
OpenAIGPT-5.4
xAIGrok-4
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
xAI
Grok-4

FAQ

Common questions about GPT-5.4 vs Grok-4.

Which is better, GPT-5.4 or Grok-4?

GPT-5.4 shows notably better performance in the majority of benchmarks. GPT-5.4 is made by OpenAI and Grok-4 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.4 compare to Grok-4 in benchmarks?

GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. Grok-4 scores AIME 2025: 91.7%, HMMT25: 90.0%, GPQA: 87.5%, LiveCodeBench: 79.0%, Humanity's Last Exam: 40.0%.

Is GPT-5.4 cheaper than Grok-4?

GPT-5.4 is 1.2x cheaper for input tokens. GPT-5.4 costs $2.50/M input and $15.00/M output via openai. Grok-4 costs $3.00/M input and $15.00/M output via xai.

What are the context window sizes for GPT-5.4 and Grok-4?

GPT-5.4 supports 1.0M tokens and Grok-4 supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.4 and Grok-4?

Key differences include context window (1.0M vs 256K), input pricing ($2.50 vs $3.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.4 and Grok-4?

GPT-5.4 is developed by OpenAI and Grok-4 is developed by xAI.

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