Gemma 2 27BvsGemini 2.5 Pro
Google DeepMind vs Google DeepMind — Side-by-side model comparison
Head-to-Head Comparison
| Metric | Gemma 2 27B | Gemini 2.5 Pro |
|---|---|---|
| Provider | ||
| Arena Rank | #18 | #4 |
| Context Window | 8K | 1M |
| Input Pricing | Free (open)/1M tokens | $1.25/1M tokens |
| Output Pricing | Free (open)/1M tokens | $10.00/1M tokens |
| Parameters | 27B | Undisclosed |
| Open Source | Yes | No |
| Best For | Research, fine-tuning, on-premise deployment | Long documents, multimodal, reasoning |
| Release Date | Jun 27, 2024 | — |
Gemma 2 27B
Gemma 2 27B is Google DeepMind's largest open-weight model in the Gemma 2 family, delivering performance that rivals much larger proprietary models. Built using research and technology from the Gemini models, it features an efficient architecture that runs well on standard hardware. Gemma 2 27B is freely available for both research and commercial use, making it one of the strongest open models available for fine-tuning and on-premise deployment scenarios.
View Google DeepMind profile →Gemini 2.5 Pro
Gemini 2.5 Pro is Google DeepMind's most capable AI model, featuring an industry-leading 1 million token context window that can process entire books, codebases, or hours of video in a single request. Built with native multimodal capabilities, it understands text, images, audio, and video natively rather than through separate encoders. The model demonstrates exceptional performance on coding benchmarks, mathematical reasoning, and multi-step planning tasks. Its massive context window makes it uniquely suited for tasks involving large document analysis, repository-scale code understanding, and long video comprehension. Gemini 2.5 Pro also features built-in 'thinking' capabilities similar to reasoning models, allowing it to tackle complex problems with improved accuracy. Available through Google AI Studio and Vertex AI.
View Google DeepMind profile →Key Differences: Gemma 2 27B vs Gemini 2.5 Pro
Gemini 2.5 Pro ranks higher in arena benchmarks (#4) indicating stronger overall performance.
Gemini 2.5 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 2.5 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 2.5 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, reasoning
The Verdict
Gemini 2.5 Pro wins our head-to-head comparison with 4 out of 5 category wins. It's the stronger choice for long documents, multimodal, reasoning, though Gemma 2 27B holds an edge in research, fine-tuning, on-premise deployment.
Last compared: March 2026 · Data sourced from public benchmarks and official pricing pages