Model Comparison

Gemma 2 9B vs GPT-4.5Which is better in 2026?

GPT-4.5 significantly outperforms across most benchmarks.

Verdict: Gemma 2 9B vs GPT-4.5 — which is better?

Gemma 2 9B (by Google) and GPT-4.5 (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.

Gemma 2 9B outperforms in 0 benchmarks, while GPT-4.5 is better at 3 benchmarks (GSM8k, HumanEval, MMLU). GPT-4.5 significantly outperforms across most benchmarks.

Choose Gemma 2 9B if…

  • you need open weights you can self-host or fine-tune

Choose GPT-4.5 if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • you want the most recent training data — it shipped Feb 2025

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemma 2 9B outperforms in 0 benchmarks, while GPT-4.5 is better at 3 benchmarks (GSM8k, HumanEval, MMLU).

GPT-4.5 significantly outperforms across most benchmarks.

Tue Jul 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4.5 specifies input context (128,000 tokens). Only GPT-4.5 specifies output context (4,096 tokens).

Google
Gemma 2 9B
Input- tokens
Output- tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.5 supports multimodal inputs, whereas Gemma 2 9B does not.

GPT-4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemma 2 9B

Text
Images
Audio
Video

GPT-4.5

Text
Images
Audio
Video

License

Usage and distribution terms

Gemma 2 9B is licensed under Gemma, while GPT-4.5 uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Gemma 2 9B

Gemma

Open weights

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemma 2 9B was released on 2024-06-27, while GPT-4.5 was released on 2025-02-27.

GPT-4.5 is 8 months newer than Gemma 2 9B.

Gemma 2 9B

Jun 27, 2024

2.1 years ago

GPT-4.5

Feb 27, 2025

1.4 years ago

8mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Has open weights
OpenAI
Larger context window (128,000 tokens)
Supports multimodal inputs
Higher GSM8k score (97.0% vs 68.6%)
Higher HumanEval score (88.0% vs 40.2%)
Higher MMLU score (90.8% vs 71.3%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemma 2 9B and GPT-4.5 side-by-side, then vote on the output you prefer.

Gemma 2 9B
✓ Preferred
GPT-4.5
Open in Playground
AI Model Comparison Table
Feature
Google
Gemma 2 9B
OpenAI
GPT-4.5

FAQ

Common questions about Gemma 2 9B vs GPT-4.5.

Which is better, Gemma 2 9B or GPT-4.5?

GPT-4.5 significantly outperforms across most benchmarks. Gemma 2 9B is made by Google and GPT-4.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemma 2 9B compare to GPT-4.5 in benchmarks?

Gemma 2 9B scores ARC-E: 88.0%, BoolQ: 84.2%, HellaSwag: 81.9%, PIQA: 81.7%, Winogrande: 80.6%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

What are the context window sizes for Gemma 2 9B and GPT-4.5?

Gemma 2 9B supports an unknown number of tokens and GPT-4.5 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 Gemma 2 9B and GPT-4.5?

Key differences include multimodal support (no vs yes), licensing (Gemma vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemma 2 9B and GPT-4.5?

Gemma 2 9B is developed by Google and GPT-4.5 is developed by OpenAI.

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