Model Comparison

GPT-4.1 nano vs Grok 4.5Which is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks. GPT-4.1 nano is 17.1x cheaper per token.

Verdict: GPT-4.1 nano vs Grok 4.5 — which is better?

GPT-4.1 nano (by OpenAI) and Grok 4.5 (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-4.1 nano outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA). Grok 4.5 significantly outperforms across most benchmarks.

On price, GPT-4.1 nano is roughly 17.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-4.1 nano also accepts a larger context window (1,047,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-4.1 nano if…

  • cost matters — it's about 17.1x cheaper per token
  • you process long inputs — it offers a 1,047,576 token context window

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-4.1 nano outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA).

Grok 4.5 significantly outperforms across most benchmarks.

Mon Jul 20 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-4.1 nano costs less

For input processing, GPT-4.1 nano ($0.10/1M tokens) is 20.0x cheaper than Grok 4.5 ($2.00/1M tokens).

For output processing, GPT-4.1 nano ($0.40/1M tokens) is 15.0x cheaper than Grok 4.5 ($6.00/1M tokens).

In conclusion, Grok 4.5 is more expensive than GPT-4.1 nano.*

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

Lowest available price from all providers
Mon Jul 20 2026 • llm-stats.com
OpenAI
GPT-4.1 nano
Input tokens$0.10
Output tokens$0.40
Best providerOpenAI
xAI
Grok 4.5
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-4.1 nano accepts 1,047,576 input tokens compared to Grok 4.5's 500,000 tokens. Only GPT-4.1 nano specifies output context (32,768 tokens).

OpenAI
GPT-4.1 nano
Input1,047,576 tokens
Output32,768 tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Mon Jul 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4.1 nano and Grok 4.5 support multimodal inputs.

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

GPT-4.1 nano

Text
Images
Audio
Video

Grok 4.5

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-4.1 nano

Proprietary

Closed source

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4.1 nano was released on 2025-04-14, while Grok 4.5 was released on 2026-07-16.

Grok 4.5 is 15 months newer than GPT-4.1 nano.

GPT-4.1 nano

Apr 14, 2025

1.3 years ago

Grok 4.5

Jul 16, 2026

4 days ago

1.3yr newer

Knowledge Cutoff

When training data ends

GPT-4.1 nano has a knowledge cutoff of 2024-05-31, while Grok 4.5 has a cutoff of 2026-02-01.

Grok 4.5 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to GPT-4.1 nano (2024-05-31).

GPT-4.1 nano

May 2024

Grok 4.5

Feb 2026

1.8 yr newer

Provider Availability

GPT-4.1 nano is available from OpenAI. Grok 4.5 is available from xAI.

GPT-4.1 nano

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M

Grok 4.5

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (1,047,576 tokens)
Less expensive input tokens
Less expensive output tokens
xAI
Higher GPQA score (93.0% vs 50.3%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4.1 nano and Grok 4.5 side-by-side, then vote on the output you prefer.

GPT-4.1 nano
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4.1 nano
xAI
Grok 4.5

FAQ

Common questions about GPT-4.1 nano vs Grok 4.5.

Which is better, GPT-4.1 nano or Grok 4.5?

Grok 4.5 significantly outperforms across most benchmarks. GPT-4.1 nano is made by OpenAI and Grok 4.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4.1 nano compare to Grok 4.5 in benchmarks?

GPT-4.1 nano scores MMLU: 80.1%, IFEval: 74.5%, CharXiv-D: 73.9%, MMMLU: 66.9%, Multi-IF: 57.2%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

Is GPT-4.1 nano cheaper than Grok 4.5?

GPT-4.1 nano is 20.0x cheaper for input tokens. GPT-4.1 nano costs $0.10/M input and $0.40/M output via openai. Grok 4.5 costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for GPT-4.1 nano and Grok 4.5?

GPT-4.1 nano supports 1.0M tokens and Grok 4.5 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-4.1 nano and Grok 4.5?

Key differences include context window (1.0M vs 500K), input pricing ($0.10 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4.1 nano and Grok 4.5?

GPT-4.1 nano is developed by OpenAI and Grok 4.5 is developed by xAI.

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