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Gemma 2 27BvsGemini 1.5 Flash

Google DeepMind vs Google DeepMind — Side-by-side model comparison

Gemini 1.5 Flash leads 4/5 categories

Head-to-Head Comparison

MetricGemma 2 27BGemini 1.5 Flash
Provider
Google DeepMind
Google DeepMind
Arena Rank
#18
#10
Context Window
8K
1M
Input Pricing
Free (open)/1M tokens
$0.075/1M tokens
Output Pricing
Free (open)/1M tokens
$0.30/1M tokens
Parameters
27B
Undisclosed
Open Source
Yes
No
Best For
Research, fine-tuning, on-premise deployment
High-volume tasks, summarization, chat
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 Flash

Gemini 1.5 Flash, developed by Google DeepMind, is a speed-optimized multimodal model with a 1 million token context window. The model processes text, images, audio, and video natively, handling long documents and extended media files efficiently. Its Mixture-of-Experts architecture enables fast inference while maintaining strong performance on general reasoning, summarization, and classification tasks. Gemini 1.5 Flash is particularly effective for high-volume applications like content analysis, chatbots, and real-time data processing. Priced at $0.075 per million input tokens and $0.30 per million output tokens, it ranks among the most cost-effective multimodal models from any major provider. Gemini 1.5 Flash ranks #10 on the Chatbot Arena leaderboard, demonstrating competitive quality despite its focus on speed and efficiency.

Key Differences: Gemma 2 27B vs Gemini 1.5 Flash

1

Gemini 1.5 Flash ranks higher in arena benchmarks (#10) indicating stronger overall performance.

2

Gemini 1.5 Flash supports a larger context window (1M), allowing it to process longer documents in a single request.

3

Gemma 2 27B is open-source (free to self-host and fine-tune) while Gemini 1.5 Flash is proprietary (API-only access).

G

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
View full Gemma 2 27B specs →
G

When to use Gemini 1.5 Flash

  • +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 high-volume tasks, summarization, chat
View full Gemini 1.5 Flash specs →

The Verdict

Gemini 1.5 Flash wins our head-to-head comparison with 4 out of 5 category wins. It's the stronger choice for high-volume tasks, summarization, chat, 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

Frequently Asked Questions

Which is better, Gemma 2 27B or Gemini 1.5 Flash?
In our head-to-head comparison, Gemini 1.5 Flash leads in 4 out of 5 categories (arena rank, context window, input pricing, output pricing, and parameters). Gemini 1.5 Flash excels at high-volume tasks, summarization, chat, while Gemma 2 27B is better suited for research, fine-tuning, on-premise deployment. The best choice depends on your specific requirements, budget, and use case.
How does Gemma 2 27B pricing compare to Gemini 1.5 Flash?
Gemma 2 27B charges Free (open) per 1M input tokens and Free (open) per 1M output tokens. Gemini 1.5 Flash charges $0.075 per 1M input tokens and $0.30 per 1M output tokens. For high-volume production workloads, the pricing difference can significantly impact total cost of ownership.
What is the context window difference between Gemma 2 27B and Gemini 1.5 Flash?
Gemma 2 27B supports a 8K token context window, while Gemini 1.5 Flash supports 1M tokens. Gemini 1.5 Flash can process longer documents, codebases, and conversations in a single request. Context window size matters most for tasks involving long documents, large codebases, or extended conversations.
Can I use Gemma 2 27B or Gemini 1.5 Flash for free?
Gemma 2 27B is a paid API model starting at Free (open) per 1M input tokens. Gemini 1.5 Flash is a paid API model starting at $0.075 per 1M input tokens. Open-source models can be self-hosted for free but require your own GPU infrastructure.
Which model has better benchmarks, Gemma 2 27B or Gemini 1.5 Flash?
Gemma 2 27B holds arena rank #18, while Gemini 1.5 Flash holds rank #10. Gemini 1.5 Flash performs better in overall arena benchmarks, which aggregate human preference ratings across coding, reasoning, and general tasks. Note that benchmarks don't capture every use case — we recommend testing both models on your specific tasks.
Is Gemma 2 27B or Gemini 1.5 Flash better for coding?
Gemma 2 27B's primary strength is research, fine-tuning, on-premise deployment. Gemini 1.5 Flash's primary strength is high-volume tasks, summarization, chat. For coding specifically, arena rank and code-specific benchmarks are the best indicators of performance.