Model Comparison

Gemini 1.5 Flash 8B vs Phi 4 ReasoningWhich is better in 2026?

Phi 4 Reasoning significantly outperforms across most benchmarks.

Verdict: Gemini 1.5 Flash 8B vs Phi 4 Reasoning — which is better?

Gemini 1.5 Flash 8B (by Google) and Phi 4 Reasoning (by Microsoft) 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.

Gemini 1.5 Flash 8B outperforms in 0 benchmarks, while Phi 4 Reasoning is better at 2 benchmarks (GPQA, MMLU-Pro). Phi 4 Reasoning significantly outperforms across most benchmarks.

Choose Gemini 1.5 Flash 8B if…

  • you want predictable pricing at $0.07/M input and $0.30/M output

Choose Phi 4 Reasoning if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Apr 2025
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini 1.5 Flash 8B outperforms in 0 benchmarks, while Phi 4 Reasoning is better at 2 benchmarks (GPQA, MMLU-Pro).

Phi 4 Reasoning significantly outperforms across most benchmarks.

Mon Jul 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

6.0B diff

Phi 4 Reasoning has 6.0B more parameters than Gemini 1.5 Flash 8B, making it 75.0% larger.

Google
Gemini 1.5 Flash 8B
8.0Bparameters
Microsoft
Phi 4 Reasoning
14.0Bparameters
8.0B
Gemini 1.5 Flash 8B
14.0B
Phi 4 Reasoning

Context Window

Maximum input and output token capacity

Only Gemini 1.5 Flash 8B specifies input context (1,048,576 tokens). Only Gemini 1.5 Flash 8B specifies output context (8,192 tokens).

Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
Microsoft
Phi 4 Reasoning
Input- tokens
Output- tokens
Mon Jul 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 1.5 Flash 8B supports multimodal inputs, whereas Phi 4 Reasoning does not.

Gemini 1.5 Flash 8B can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 1.5 Flash 8B

Text
Images
Audio
Video

Phi 4 Reasoning

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 1.5 Flash 8B is licensed under a proprietary license, while Phi 4 Reasoning uses MIT.

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

Gemini 1.5 Flash 8B

Proprietary

Closed source

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

Gemini 1.5 Flash 8B was released on 2024-03-15, while Phi 4 Reasoning was released on 2025-04-30.

Phi 4 Reasoning is 14 months newer than Gemini 1.5 Flash 8B.

Gemini 1.5 Flash 8B

Mar 15, 2024

2.4 years ago

Phi 4 Reasoning

Apr 30, 2025

1.2 years ago

1.1yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a knowledge cutoff of 2024-10-01, while Phi 4 Reasoning has a cutoff of 2025-03-01.

Phi 4 Reasoning has more recent training data (up to 2025-03-01), making it potentially better informed about events through that date compared to Gemini 1.5 Flash 8B (2024-10-01).

Gemini 1.5 Flash 8B

Oct 2024

Phi 4 Reasoning

Mar 2025

5 mo newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Microsoft
Has open weights
Higher GPQA score (65.8% vs 38.4%)
Higher MMLU-Pro score (74.3% vs 58.7%)
GoogleGemini 1.5 Flash 8B
MicrosoftPhi 4 Reasoning
Compare in Playground

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 1.5 Flash 8B and Phi 4 Reasoning side-by-side, then vote on the output you prefer.

Gemini 1.5 Flash 8B
✓ Preferred
Phi 4 Reasoning
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 1.5 Flash 8B
Microsoft
Phi 4 Reasoning

FAQ

Common questions about Gemini 1.5 Flash 8B vs Phi 4 Reasoning.

Which is better, Gemini 1.5 Flash 8B or Phi 4 Reasoning?

Phi 4 Reasoning significantly outperforms across most benchmarks. Gemini 1.5 Flash 8B is made by Google and Phi 4 Reasoning is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 1.5 Flash 8B compare to Phi 4 Reasoning in benchmarks?

Gemini 1.5 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%. Phi 4 Reasoning scores FlenQA: 97.7%, HumanEval+: 92.9%, IFEval: 83.4%, OmniMath: 76.6%, AIME 2024: 75.3%.

What are the context window sizes for Gemini 1.5 Flash 8B and Phi 4 Reasoning?

Gemini 1.5 Flash 8B supports 1.0M tokens and Phi 4 Reasoning supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 1.5 Flash 8B and Phi 4 Reasoning?

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

Who makes Gemini 1.5 Flash 8B and Phi 4 Reasoning?

Gemini 1.5 Flash 8B is developed by Google and Phi 4 Reasoning is developed by Microsoft.

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