Model Comparison

Claude Sonnet 4.5 vs o1-miniWhich is better in 2026?

Claude Sonnet 4.5 significantly outperforms across most benchmarks. o1-mini is 1.1x cheaper per token.

Verdict: Claude Sonnet 4.5 vs o1-mini — which is better?

Claude Sonnet 4.5 (by Anthropic) and o1-mini (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while o1-mini is better at 0 benchmarks. Claude Sonnet 4.5 significantly outperforms across most benchmarks.

On price, o1-mini is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Sonnet 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Sonnet 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you process long inputs — it offers a 200,000 token context window
  • you want the most recent training data — it shipped Sep 2025

Choose o1-mini if…

  • cost matters — it's about 1.1x cheaper per token
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while o1-mini is better at 0 benchmarks.

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Tue Jun 09 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o1-mini costs less

For input processing, Claude Sonnet 4.5 ($3.00/1M tokens) costs the same as o1-mini ($3.00/1M tokens).

For output processing, Claude Sonnet 4.5 ($15.00/1M tokens) is 1.3x more expensive than o1-mini ($12.00/1M tokens).

In conclusion, Claude Sonnet 4.5 is more expensive than o1-mini.*

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

Lowest available price from all providers
Tue Jun 09 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
o1-mini
Input tokens$3.00
Output tokens$12.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Sonnet 4.5 accepts 200,000 input tokens compared to o1-mini's 128,000 tokens. o1-mini can generate longer responses up to 65,536 tokens, while Claude Sonnet 4.5 is limited to 64,000 tokens.

Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
o1-mini
Input128,000 tokens
Output65,536 tokens
Tue Jun 09 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 4.5 supports multimodal inputs, whereas o1-mini does not.

Claude Sonnet 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Sonnet 4.5

Text
Images
Audio
Video

o1-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.

Claude Sonnet 4.5

Proprietary

Closed source

o1-mini

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while o1-mini was released on 2024-09-12.

Claude Sonnet 4.5 is 13 months newer than o1-mini.

Claude Sonnet 4.5

Sep 29, 2025

8 months ago

1.0yr newer
o1-mini

Sep 12, 2024

1.7 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a documented knowledge cutoff of 2025-01-31, while o1-mini's cutoff date is not specified.

We can confirm Claude Sonnet 4.5's training data extends to 2025-01-31, but cannot make a direct comparison without o1-mini's cutoff date.

Claude Sonnet 4.5

Jan 2025

o1-mini

—

Provider Availability

Claude Sonnet 4.5 is available from Anthropic. o1-mini is available from OpenAI, Azure.

Claude Sonnet 4.5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

o1-mini

openai logo
OpenAI
Input Price:Input: $3.00/1MOutput Price:Output: $12.00/1M
azure logo
Azure
Input Price:Input: $3.30/1MOutput Price:Output: $13.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher GPQA score (83.4% vs 60.0%)
OpenAI
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
OpenAI
o1-mini

FAQ

Common questions about Claude Sonnet 4.5 vs o1-mini.

Which is better, Claude Sonnet 4.5 or o1-mini?

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is made by Anthropic and o1-mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 4.5 compare to o1-mini in benchmarks?

Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%. o1-mini scores HumanEval: 92.4%, MATH-500: 90.0%, MMLU: 85.2%, SuperGLUE: 75.0%, GPQA: 60.0%.

Is Claude Sonnet 4.5 cheaper than o1-mini?

Both models cost $3.00 per million input tokens.

What are the context window sizes for Claude Sonnet 4.5 and o1-mini?

Claude Sonnet 4.5 supports 200K tokens and o1-mini 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 Claude Sonnet 4.5 and o1-mini?

Key differences include context window (200K vs 128K), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 4.5 and o1-mini?

Claude Sonnet 4.5 is developed by Anthropic and o1-mini is developed by OpenAI.

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