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Gemini 2.5 Flash vs Phi 4 Reasoning Plus

Gemini 2.5 Flash leads the LLM Stats Score 21.9 to 15.2.

Google · Microsoft · Updated for 2026

Which is better?

Gemini 2.5 Flash leads the overall LLM Stats Score 21.9 to 15.2, ranking #172 overall.

In the 3 individual benchmarks reported for both models, Gemini 2.5 Flash wins 2; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 2.5 Flash

  • overall performance matters — it scores 21.9 and ranks #172 on LLM Stats
  • you value its reported benchmark strengths — it wins 2 of 3 exact shared results
  • you want the most recent training data — it shipped May 2025

Choose Phi 4 Reasoning Plus

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

At a glance

The differences that matter most.

Gemini 2.5 Flash
Google
Phi 4 Reasoning Plus
Microsoft
Core performance indexes
LLM Stats Score
21.9
#172
15.2
#219
Reasoning
21.6
#170
15.5
#213
Coding
8.7
#172
5.8
#188
Cost, coverage & limits
Benchmark wins
2 of 3
1 of 3
Input price
$0.30 / M
— / M
Output price
$2.50 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Gemini 2.5 Flash
Phi 4 Reasoning Plus
Math
16.2#200
18.3#174
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

14 reported for Gemini 2.5 Flash · 11 for Phi 4 Reasoning Plus

3 shared

Gemini 2.5 Flash outperforms in 2 benchmarks (AIME 2024, GPQA), while Phi 4 Reasoning Plus is better at 1 benchmark (AIME 2025).

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks.

Mon Sep 07 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Gemini 2.5 Flash specifies input context (1,048,576 tokens). Only Gemini 2.5 Flash specifies output context (65,536 tokens).

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Microsoft
Phi 4 Reasoning Plus
Input- tokens
Output- tokens
Mon Sep 07 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Gemini 2.5 Flash supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.

Gemini 2.5 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 2.5 Flash

Text
Images
Audio
Video

Phi 4 Reasoning Plus

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash is licensed under a proprietary license, while Phi 4 Reasoning Plus uses MIT.

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

Gemini 2.5 Flash

Proprietary

Closed source

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while Phi 4 Reasoning Plus was released on 2025-04-30.

Gemini 2.5 Flash is 1 month newer than Phi 4 Reasoning Plus.

Gemini 2.5 Flash

May 20, 2025

1.3 years ago

2w newer
Phi 4 Reasoning Plus

Apr 30, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a knowledge cutoff of 2025-01-31, while Phi 4 Reasoning Plus has a cutoff of 2025-03-01.

Phi 4 Reasoning Plus has more recent training data (up to 2025-03-01), making it potentially better informed about events through that date compared to Gemini 2.5 Flash (2025-01-31).

Gemini 2.5 Flash

Jan 2025

Phi 4 Reasoning Plus

Mar 2025

2 mo newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 2.5 Flash and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

Gemini 2.5 Flash
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about Gemini 2.5 Flash vs Phi 4 Reasoning Plus.

Which is better, Gemini 2.5 Flash or Phi 4 Reasoning Plus?

Gemini 2.5 Flash leads the LLM Stats Score 21.9 to 15.2. Gemini 2.5 Flash is made by Google and Phi 4 Reasoning Plus is made by Microsoft. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 2.5 Flash compare to Phi 4 Reasoning Plus in benchmarks?

Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

What are the context window sizes for Gemini 2.5 Flash and Phi 4 Reasoning Plus?

Gemini 2.5 Flash supports 1.0M tokens and Phi 4 Reasoning Plus 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 2.5 Flash and Phi 4 Reasoning Plus?

Key differences include LLM Stats Score (21.9 vs 15.2), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Flash and Phi 4 Reasoning Plus?

Gemini 2.5 Flash is developed by Google and Phi 4 Reasoning Plus is developed by Microsoft.

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