Gemma 2 27BvsGemini 1.5 Pro
Google DeepMind vs Google DeepMind — Side-by-side model comparison
Head-to-Head Comparison
| Metric | Gemma 2 27B | Gemini 1.5 Pro |
|---|---|---|
| Provider | Google DeepMind | Google DeepMind |
| Arena Rank | #18 | #4 |
| Context Window | 8K | 1M |
| Input Pricing | Free (open)/1M tokens | $3.50/1M tokens |
| Output Pricing | Free (open)/1M tokens | $10.50/1M tokens |
| Parameters | 27B | Undisclosed |
| Open Source | Yes | No |
| Best For | Research, fine-tuning, on-premise deployment | Long documents, multimodal analysis, coding |
| Release Date | Jun 27, 2024 | May 14, 2024 |
Gemma 2 27B
Gemma 2 27B, developed by Google DeepMind, is the largest model in the Gemma 2 open-source family with 27 billion parameters and an 8K token context window. The model delivers performance competitive with much larger open-source alternatives while requiring less compute for inference. Its architecture incorporates knowledge distillation techniques from larger Gemini models, achieving strong results on reasoning, coding, and multilingual benchmarks. Gemma 2 27B supports fine-tuning and can run on a single high-end consumer GPU, making it practical for on-premise enterprise deployments with data privacy requirements. As a fully open-source model with permissive licensing, it enables commercial deployment without API costs. Gemma 2 27B ranks #18 on the Chatbot Arena leaderboard, placing it among the strongest open-weight models in its parameter class.
Gemini 1.5 Pro
Gemini 1.5 Pro, developed by Google DeepMind, is a high-capability multimodal model with a 1 million token context window that can process entire books, codebases, or hours of video in a single request. The model uses a Mixture-of-Experts architecture to deliver strong performance on complex reasoning, coding, mathematical analysis, and multimodal understanding tasks. Its massive context window makes it uniquely suited for tasks involving large-scale document analysis, repository-wide code review, and comprehensive media processing. Priced at $3.50 per million input tokens and $10.50 per million output tokens, it offers substantial context capacity at competitive pricing. Gemini 1.5 Pro ranks #4 on the Chatbot Arena leaderboard, reflecting its position as one of the most capable models available for tasks requiring deep, contextual understanding.
Key Differences: Gemma 2 27B vs Gemini 1.5 Pro
Gemini 1.5 Pro ranks higher in arena benchmarks (#4) indicating stronger overall performance.
Gemini 1.5 Pro supports a larger context window (1M), allowing it to process longer documents in a single request.
Gemma 2 27B is open-source (free to self-host and fine-tune) while Gemini 1.5 Pro is proprietary (API-only access).
When to use Gemma 2 27B
- +You need to self-host or fine-tune the model
- +Your use case involves research, fine-tuning, on-premise deployment
When to use Gemini 1.5 Pro
- +You need the highest quality output based on arena rankings
- +You need to process long documents (1M context)
- +You prefer a managed API without infrastructure overhead
- +Your use case involves long documents, multimodal analysis, coding
The Verdict
Gemini 1.5 Pro wins our head-to-head comparison with 4 out of 5 category wins. It's the stronger choice for long documents, multimodal analysis, coding, though Gemma 2 27B holds an edge in research, fine-tuning, on-premise deployment.
Last compared: April 2026 · Data sourced from public benchmarks and official pricing pages