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GPT-4.5 vs Grok-3 Mini

Grok-3 Mini leads the LLM Stats Score 31.3 to 20.2. Grok-3 Mini is 267.9x cheaper per token.

OpenAI · xAI · Updated for 2026

Which is better?

Grok-3 Mini leads the overall LLM Stats Score 31.3 to 20.2, ranking #111 overall.

In the 2 individual benchmarks reported for both models, Grok-3 Mini wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Grok-3 Mini is roughly 267.9x 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-4.5

  • you want the most recent training data — it shipped Feb 2025

Choose Grok-3 Mini

  • overall performance matters — it scores 31.3 and ranks #111 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • cost matters — it's about 267.9x cheaper per token

At a glance

The differences that matter most.

GPT-4.5
OpenAI
Grok-3 Mini
xAI
Core performance indexes
LLM Stats Score
20.2
#196
31.3
#111
Reasoning
20.4
#188
30.9
#112
Coding
5.8
#195
18.7
#110
Cost, coverage & limits
Benchmark wins
0 of 2
2 of 2
Input price
$75.00 / M
$0.30 / M
Output price
$150.00 / M
$0.50 / M
Context window
128,000
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT-4.5
Grok-3 Mini
Math
20.7#155
28.3#94
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

26 reported for GPT-4.5 · 4 for Grok-3 Mini

2 shared

GPT-4.5 outperforms in 0 benchmarks, while Grok-3 Mini is better at 2 benchmarks (AIME 2024, GPQA).

Grok-3 Mini significantly outperforms across most benchmarks.

Mon Sep 21 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Grok-3 Mini costs less

For input processing, GPT-4.5 ($75.00/1M tokens) is 250.0x more expensive than Grok-3 Mini ($0.30/1M tokens).

For output processing, GPT-4.5 ($150.00/1M tokens) is 300.0x more expensive than Grok-3 Mini ($0.50/1M tokens).

In conclusion, GPT-4.5 is more expensive than Grok-3 Mini.*

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

Lowest available price from all providers
Mon Sep 21 2026 • llm-stats.com
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
xAI
Grok-3 Mini
Input tokens$0.30
Output tokens$0.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 128,000 tokens. Grok-3 Mini can generate longer responses up to 8,000 tokens, while GPT-4.5 is limited to 4,096 tokens.

OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
xAI
Grok-3 Mini
Input128,000 tokens
Output8,000 tokens
Mon Sep 21 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-4.5 and Grok-3 Mini support multimodal inputs.

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

GPT-4.5

Text
Images
Audio
Video

Grok-3 Mini

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-4.5

Proprietary

Closed source

Grok-3 Mini

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4.5 was released on 2025-02-27, while Grok-3 Mini was released on 2025-02-17.

GPT-4.5 is 0 month newer than Grok-3 Mini.

GPT-4.5

Feb 27, 2025

1.6 years ago

1w newer
Grok-3 Mini

Feb 17, 2025

1.6 years ago

Knowledge Cutoff

When training data ends

Grok-3 Mini has a documented knowledge cutoff of 2024-11-17, while GPT-4.5's cutoff date is not specified.

We can confirm Grok-3 Mini's training data extends to 2024-11-17, but cannot make a direct comparison without GPT-4.5's cutoff date.

GPT-4.5

—

Grok-3 Mini

Nov 2024

Provider Availability

GPT-4.5 is available from OpenAI. Grok-3 Mini is available from xAI.

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M

Grok-3 Mini

xai logo
xAI
Input Price:Input: $0.30/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-4.5 and Grok-3 Mini side-by-side, then vote on the output you prefer.

GPT-4.5
✓ Preferred
Grok-3 Mini
Open in Playground

FAQ

Common questions about GPT-4.5 vs Grok-3 Mini.

Which is better, GPT-4.5 or Grok-3 Mini?

Grok-3 Mini leads the LLM Stats Score 31.3 to 20.2. GPT-4.5 is made by OpenAI and Grok-3 Mini is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-4.5 compare to Grok-3 Mini in benchmarks?

GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%. Grok-3 Mini scores AIME 2024: 95.8%, AIME 2025: 90.8%, GPQA: 84.0%, LiveCodeBench: 80.4%.

Is GPT-4.5 cheaper than Grok-3 Mini?

Grok-3 Mini is 250.0x cheaper for input tokens. GPT-4.5 costs $75.00/M input and $150.00/M output via openai. Grok-3 Mini costs $0.30/M input and $0.50/M output via xai.

What are the context window sizes for GPT-4.5 and Grok-3 Mini?

GPT-4.5 supports 128K tokens and Grok-3 Mini supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-4.5 and Grok-3 Mini?

Key differences include LLM Stats Score (20.2 vs 31.3), input pricing ($75.00 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4.5 and Grok-3 Mini?

GPT-4.5 is developed by OpenAI and Grok-3 Mini is developed by xAI.

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