Model Comparison

GPT-4o vs Gemini 1.5 Flash

GPT-4o significantly outperforms across most benchmarks. Gemini 1.5 Flash is 16.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

GPT-4o outperforms in 4 benchmarks (GPQA, MMLU, MMLU-Pro, MMMU), while Gemini 1.5 Flash is better at 1 benchmark (MathVista).

GPT-4o significantly outperforms across most benchmarks.

Thu Apr 09 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, GPT-4o ($2.50/1M tokens) is 16.7x more expensive than Gemini 1.5 Flash ($0.15/1M tokens).

For output processing, GPT-4o ($10.00/1M tokens) is 16.7x more expensive than Gemini 1.5 Flash ($0.60/1M 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
Thu Apr 09 2026 • llm-stats.com
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
Google
Gemini 1.5 Flash
Input tokens$0.15
Output tokens$0.60
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

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. GPT-4o can generate longer responses up to 16,384 tokens, while Gemini 1.5 Flash is limited to 8,192 tokens.

OpenAI
GPT-4o
Input128,000 tokens
Output16,384 tokens
Google
Gemini 1.5 Flash
Input1,048,576 tokens
Output8,192 tokens
Thu Apr 09 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

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

GPT-4o

Text
Images
Audio
Video

Gemini 1.5 Flash

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.

GPT-4o

Proprietary

Closed source

Gemini 1.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4o was released on 2024-08-06, while Gemini 1.5 Flash was released on 2024-05-01.

GPT-4o is 3 months newer than Gemini 1.5 Flash.

GPT-4o

Aug 6, 2024

1.7 years ago

3mo newer
Gemini 1.5 Flash

May 1, 2024

1.9 years ago

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.

GPT-4o

—

Gemini 1.5 Flash

Nov 2023

Provider Availability

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

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

Gemini 1.5 Flash

google logo
Google
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Higher GPQA score (70.1% vs 51.0%)
Higher MMLU score (85.7% vs 78.9%)
Higher MMLU-Pro score (74.7% vs 67.3%)
Higher MMMU score (72.2% vs 62.3%)
Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Higher MathVista score (65.8% vs 61.4%)
OpenAIGPT-4o
GoogleGemini 1.5 Flash
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Detailed Comparison

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

FAQ

Common questions about GPT-4o vs Gemini 1.5 Flash

GPT-4o significantly outperforms across most benchmarks. GPT-4o is made by OpenAI and Gemini 1.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-4o scores AI2D: 94.2%, DocVQA: 92.8%, ChartQA: 85.7%, MMLU: 85.7%, CharXiv-D: 85.3%. Gemini 1.5 Flash scores XSTest: 97.0%, HellaSwag: 86.5%, GSM8k: 86.2%, BIG-Bench Hard: 85.5%, MGSM: 82.6%.
Gemini 1.5 Flash is 16.7x cheaper for input tokens. GPT-4o costs $2.50/M input and $10.00/M output via azure. Gemini 1.5 Flash costs $0.15/M input and $0.60/M output via google.
GPT-4o supports 128K tokens and Gemini 1.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (128K vs 1.0M), input pricing ($2.50 vs $0.15/M). See the full comparison above for benchmark-by-benchmark results.
GPT-4o is developed by OpenAI and Gemini 1.5 Flash is developed by Google.