Model Comparison

GPT-5.1 vs o4-mini

GPT-5.1 significantly outperforms across most benchmarks. o4-mini is 1.8x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

GPT-5.1 outperforms in 4 benchmarks (AIME 2025, GPQA, MMMU, SWE-Bench Verified), while o4-mini is better at 0 benchmarks.

GPT-5.1 significantly outperforms across most benchmarks.

Thu May 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o4-mini costs less

For input processing, GPT-5.1 ($1.25/1M tokens) is 1.1x more expensive than o4-mini ($1.10/1M tokens).

For output processing, GPT-5.1 ($10.00/1M tokens) is 2.3x more expensive than o4-mini ($4.40/1M tokens).

In conclusion, GPT-5.1 is more expensive than o4-mini.*

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

Lowest available price from all providers
Thu May 14 2026 • llm-stats.com
OpenAI
GPT-5.1
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
OpenAI
o4-mini
Input tokens$1.10
Output tokens$4.40
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.1 accepts 400,000 input tokens compared to o4-mini's 200,000 tokens. GPT-5.1 can generate longer responses up to 128,000 tokens, while o4-mini is limited to 100,000 tokens.

OpenAI
GPT-5.1
Input400,000 tokens
Output128,000 tokens
OpenAI
o4-mini
Input200,000 tokens
Output100,000 tokens
Thu May 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.1 and o4-mini support multimodal inputs.

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

GPT-5.1

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.

GPT-5.1

Proprietary

Closed source

o4-mini

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.1 was released on 2025-11-13, while o4-mini was released on 2025-04-16.

GPT-5.1 is 7 months newer than o4-mini.

GPT-5.1

Nov 13, 2025

6 months ago

7mo newer
o4-mini

Apr 16, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

GPT-5.1 has a knowledge cutoff of 2024-09-30, while o4-mini has a cutoff of 2024-05-31.

GPT-5.1 has more recent training data (up to 2024-09-30), making it potentially better informed about events through that date compared to o4-mini (2024-05-31).

GPT-5.1

Sep 2024

4 mo newer
o4-mini

May 2024

Provider Availability

GPT-5.1 is available from OpenAI. o4-mini is available from OpenAI.

GPT-5.1

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

o4-mini

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

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Higher AIME 2025 score (94.0% vs 92.7%)
Higher GPQA score (88.1% vs 81.4%)
Higher MMMU score (85.4% vs 81.6%)
Higher SWE-Bench Verified score (76.3% vs 68.1%)
OpenAI
Less expensive input tokens
Less expensive output tokens
OpenAIGPT-5.1
OpenAIo4-mini
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.1
OpenAI
o4-mini

FAQ

Common questions about GPT-5.1 vs o4-mini.

Which is better, GPT-5.1 or o4-mini?

GPT-5.1 significantly outperforms across most benchmarks. GPT-5.1 is made by OpenAI and o4-mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.1 compare to o4-mini in benchmarks?

GPT-5.1 scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%. o4-mini scores AIME 2024: 93.4%, AIME 2025: 92.7%, MathVista: 84.3%, MMMU: 81.6%, GPQA: 81.4%.

Is GPT-5.1 cheaper than o4-mini?

o4-mini is 1.1x cheaper for input tokens. GPT-5.1 costs $1.25/M input and $10.00/M output via openai. o4-mini costs $1.10/M input and $4.40/M output via openai.

What are the context window sizes for GPT-5.1 and o4-mini?

GPT-5.1 supports 400K tokens and o4-mini 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-5.1 and o4-mini?

Key differences include context window (400K vs 200K), input pricing ($1.25 vs $1.10/M). See the full comparison above for benchmark-by-benchmark results.