Model Comparison

GPT-5 mini vs o3

GPT-5 mini shows notably better performance in the majority of benchmarks. GPT-5 mini is 5.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

GPT-5 mini outperforms in 3 benchmarks (AIME 2025, FrontierMath, Humanity's Last Exam), while o3 is better at 1 benchmark (GPQA).

GPT-5 mini shows notably better performance in the majority of benchmarks.

Fri May 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5 mini costs less

For input processing, GPT-5 mini ($0.25/1M tokens) is 8.0x cheaper than o3 ($2.00/1M tokens).

For output processing, GPT-5 mini ($2.00/1M tokens) is 4.0x cheaper than o3 ($8.00/1M tokens).

In conclusion, o3 is more expensive than GPT-5 mini.*

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

Lowest available price from all providers
Fri May 15 2026 • llm-stats.com
OpenAI
GPT-5 mini
Input tokens$0.25
Output tokens$2.00
Best providerOpenAI
OpenAI
o3
Input tokens$2.00
Output tokens$8.00
Best providerOpenAI
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Context Window

Maximum input and output token capacity

GPT-5 mini accepts 400,000 input tokens compared to o3's 200,000 tokens. GPT-5 mini can generate longer responses up to 128,000 tokens, while o3 is limited to 100,000 tokens.

OpenAI
GPT-5 mini
Input400,000 tokens
Output128,000 tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Fri May 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5 mini and o3 support multimodal inputs.

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

GPT-5 mini

Text
Images
Audio
Video

o3

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-5 mini

Proprietary

Closed source

o3

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5 mini was released on 2025-08-07, while o3 was released on 2025-04-16.

GPT-5 mini is 4 months newer than o3.

GPT-5 mini

Aug 7, 2025

9 months ago

3mo newer
o3

Apr 16, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

GPT-5 mini has a knowledge cutoff of 2024-05-30, while o3 has a cutoff of 2024-05-31.

o3 has more recent training data (up to 2024-05-31), making it potentially better informed about events through that date compared to GPT-5 mini (2024-05-30).

GPT-5 mini

May 2024

o3

May 2024

Provider Availability

GPT-5 mini is available from OpenAI. o3 is available from OpenAI.

GPT-5 mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M

o3

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $8.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher AIME 2025 score (91.1% vs 86.4%)
Higher FrontierMath score (22.1% vs 15.8%)
Higher Humanity's Last Exam score (16.7% vs 14.7%)
OpenAI
Higher GPQA score (83.3% vs 82.3%)
OpenAIGPT-5 mini
OpenAIo3
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5 mini
OpenAI
o3

FAQ

Common questions about GPT-5 mini vs o3.

Which is better, GPT-5 mini or o3?

GPT-5 mini shows notably better performance in the majority of benchmarks. GPT-5 mini is made by OpenAI and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5 mini compare to o3 in benchmarks?

GPT-5 mini scores AIME 2025: 91.1%, HMMT 2025: 87.8%, GPQA: 82.3%, FrontierMath: 22.1%, Humanity's Last Exam: 16.7%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.

Is GPT-5 mini cheaper than o3?

GPT-5 mini is 8.0x cheaper for input tokens. GPT-5 mini costs $0.25/M input and $2.00/M output via openai. o3 costs $2.00/M input and $8.00/M output via openai.

What are the context window sizes for GPT-5 mini and o3?

GPT-5 mini supports 400K tokens and o3 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5 mini and o3?

Key differences include context window (400K vs 200K), input pricing ($0.25 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.