Model Comparison

Gemini 2.5 Flash vs o4-mini

o4-mini significantly outperforms across most benchmarks. Gemini 2.5 Flash is 2.3x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

8 benchmarks

Gemini 2.5 Flash outperforms in 1 benchmarks (GPQA), while o4-mini is better at 7 benchmarks (Aider-Polyglot, Aider-Polyglot Edit, AIME 2024, AIME 2025, Humanity's Last Exam, MMMU, SWE-Bench Verified).

o4-mini significantly outperforms across most benchmarks.

Wed Apr 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash costs less

For input processing, Gemini 2.5 Flash ($0.30/1M tokens) is 3.7x cheaper than o4-mini ($1.10/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 1.8x cheaper than o4-mini ($4.40/1M tokens).

In conclusion, o4-mini is more expensive than Gemini 2.5 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Apr 15 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
OpenAI
o4-mini
Input tokens$1.10
Output tokens$4.40
Best providerOpenAI
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Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to o4-mini's 200,000 tokens. o4-mini can generate longer responses up to 100,000 tokens, while Gemini 2.5 Flash is limited to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
OpenAI
o4-mini
Input200,000 tokens
Output100,000 tokens
Wed Apr 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash and o4-mini support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 2.5 Flash

Text
Images
Audio
Video

o4-mini

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 2.5 Flash

Proprietary

Closed source

o4-mini

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while o4-mini was released on 2025-04-16.

Gemini 2.5 Flash is 1 month newer than o4-mini.

Gemini 2.5 Flash

May 20, 2025

11 months ago

1mo newer
o4-mini

Apr 16, 2025

12 months ago

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a knowledge cutoff of 2025-01-31, while o4-mini has a cutoff of 2024-05-31.

Gemini 2.5 Flash has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to o4-mini (2024-05-31).

Gemini 2.5 Flash

Jan 2025

8 mo newer
o4-mini

May 2024

Provider Availability

Gemini 2.5 Flash is available from Google. o4-mini is available from OpenAI.

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

o4-mini

openai logo
OpenAI
Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (82.8% vs 81.4%)
OpenAI
Higher Aider-Polyglot score (68.9% vs 61.9%)
Higher Aider-Polyglot Edit score (58.2% vs 56.7%)
Higher AIME 2024 score (93.4% vs 88.0%)
Higher AIME 2025 score (92.7% vs 72.0%)
Higher Humanity's Last Exam score (14.7% vs 11.0%)
Higher MMMU score (81.6% vs 79.7%)
Higher SWE-Bench Verified score (68.1% vs 60.4%)
GoogleGemini 2.5 Flash
OpenAIo4-mini
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash
OpenAI
o4-mini

FAQ

Common questions about Gemini 2.5 Flash vs o4-mini

o4-mini significantly outperforms across most benchmarks. Gemini 2.5 Flash is made by Google and o4-mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. o4-mini scores AIME 2024: 93.4%, AIME 2025: 92.7%, MathVista: 84.3%, MMMU: 81.6%, GPQA: 81.4%.
Gemini 2.5 Flash is 3.7x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google. o4-mini costs $1.10/M input and $4.40/M output via openai.
Gemini 2.5 Flash supports 1.0M tokens and o4-mini supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 200K), input pricing ($0.30 vs $1.10/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 2.5 Flash is developed by Google and o4-mini is developed by OpenAI.