Model Comparison

Gemini 1.5 Flash vs GPT-4o

GPT-4o shows notably better performance in the majority of benchmarks. Gemini 1.5 Flash is 16.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Gemini 1.5 Flash outperforms in 2 benchmarks (MATH, MathVista), while GPT-4o is better at 5 benchmarks (GPQA, HumanEval, MGSM, MMLU, MMLU-Pro).

GPT-4o shows notably better performance in the majority of benchmarks.

Tue May 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash costs less

For input processing, Gemini 1.5 Flash ($0.15/1M tokens) is 16.7x cheaper than GPT-4o ($2.50/1M tokens).

For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 16.7x cheaper than GPT-4o ($10.00/1M tokens).

In conclusion, GPT-4o is more expensive than Gemini 1.5 Flash.*

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

Lowest available price from all providers
Tue May 26 2026 • llm-stats.com
Google
Gemini 1.5 Flash
Input tokens$0.15
Output tokens$0.60
Best providerGoogle
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
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Context Window

Maximum input and output token capacity

Gemini 1.5 Flash accepts 1,048,576 input tokens compared to GPT-4o's 128,000 tokens. Gemini 1.5 Flash can generate longer responses up to 8,192 tokens, while GPT-4o is limited to 4,096 tokens.

Google
Gemini 1.5 Flash
Input1,048,576 tokens
Output8,192 tokens
OpenAI
GPT-4o
Input128,000 tokens
Output4,096 tokens
Tue May 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Flash and GPT-4o support multimodal inputs.

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

Gemini 1.5 Flash

Text
Images
Audio
Video

GPT-4o

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 1.5 Flash

Proprietary

Closed source

GPT-4o

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash was released on 2024-05-01, while GPT-4o was released on 2024-05-13.

GPT-4o is 0 month newer than Gemini 1.5 Flash.

Gemini 1.5 Flash

May 1, 2024

2.1 years ago

GPT-4o

May 13, 2024

2.0 years ago

1w newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a documented knowledge cutoff of 2023-11-01, while GPT-4o's cutoff date is not specified.

We can confirm Gemini 1.5 Flash's training data extends to 2023-11-01, but cannot make a direct comparison without GPT-4o's cutoff date.

Gemini 1.5 Flash

Nov 2023

GPT-4o

—

Provider Availability

Gemini 1.5 Flash is available from Google. GPT-4o is available from Azure, OpenAI.

Gemini 1.5 Flash

google logo
Google
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

GPT-4o

azure logo
Azure
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
* 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 MATH score (77.9% vs 76.6%)
Higher MathVista score (65.8% vs 63.8%)
OpenAI
Higher GPQA score (53.6% vs 51.0%)
Higher HumanEval score (90.2% vs 74.3%)
Higher MGSM score (90.5% vs 82.6%)
Higher MMLU score (88.7% vs 78.9%)
Higher MMLU-Pro score (72.6% vs 67.3%)
GoogleGemini 1.5 Flash
OpenAIGPT-4o
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 1.5 Flash
OpenAI
GPT-4o

FAQ

Common questions about Gemini 1.5 Flash vs GPT-4o.

Which is better, Gemini 1.5 Flash or GPT-4o?

GPT-4o shows notably better performance in the majority of benchmarks. Gemini 1.5 Flash is made by Google and GPT-4o is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 1.5 Flash compare to GPT-4o in benchmarks?

Gemini 1.5 Flash scores XSTest: 97.0%, HellaSwag: 86.5%, GSM8k: 86.2%, BIG-Bench Hard: 85.5%, MGSM: 82.6%. GPT-4o scores MGSM: 90.5%, HumanEval: 90.2%, MMLU: 88.7%, DROP: 83.4%, MATH: 76.6%.

Is Gemini 1.5 Flash cheaper than GPT-4o?

Gemini 1.5 Flash is 16.7x cheaper for input tokens. Gemini 1.5 Flash costs $0.15/M input and $0.60/M output via google. GPT-4o costs $2.50/M input and $10.00/M output via azure.

What are the context window sizes for Gemini 1.5 Flash and GPT-4o?

Gemini 1.5 Flash supports 1.0M tokens and GPT-4o supports 128K 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 and GPT-4o?

Key differences include context window (1.0M vs 128K), input pricing ($0.15 vs $2.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 1.5 Flash and GPT-4o?

Gemini 1.5 Flash is developed by Google and GPT-4o is developed by OpenAI.