Model Comparison

o3-mini vs Claude Sonnet 4.5

Claude Sonnet 4.5 significantly outperforms across most benchmarks. o3-mini is 3.1x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

o3-mini outperforms in 0 benchmarks, while Claude Sonnet 4.5 is better at 3 benchmarks (GPQA, TAU-bench Airline, TAU-bench Retail).

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Wed Apr 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o3-mini costs less

For input processing, o3-mini ($1.10/1M tokens) is 2.7x cheaper than Claude Sonnet 4.5 ($3.00/1M tokens).

For output processing, o3-mini ($4.40/1M tokens) is 3.4x cheaper than Claude Sonnet 4.5 ($15.00/1M tokens).

In conclusion, Claude Sonnet 4.5 is more expensive than o3-mini.*

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

Lowest available price from all providers
Wed Apr 15 2026 • llm-stats.com
OpenAI
o3-mini
Input tokens$1.10
Output tokens$4.40
Best providerAzure
Anthropic
Claude Sonnet 4.5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 200,000 tokens. o3-mini can generate longer responses up to 100,000 tokens, while Claude Sonnet 4.5 is limited to 64,000 tokens.

OpenAI
o3-mini
Input200,000 tokens
Output100,000 tokens
Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
Wed Apr 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 4.5 supports multimodal inputs, whereas o3-mini does not.

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

o3-mini

Text
Images
Audio
Video

Claude Sonnet 4.5

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.

o3-mini

Proprietary

Closed source

Claude Sonnet 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

o3-mini was released on 2025-01-30, while Claude Sonnet 4.5 was released on 2025-09-29.

Claude Sonnet 4.5 is 8 months newer than o3-mini.

o3-mini

Jan 30, 2025

1.2 years ago

Claude Sonnet 4.5

Sep 29, 2025

6 months ago

8mo newer

Knowledge Cutoff

When training data ends

o3-mini has a knowledge cutoff of 2023-09-30, while Claude Sonnet 4.5 has a cutoff of 2025-01-31.

Claude Sonnet 4.5 has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to o3-mini (2023-09-30).

o3-mini

Sep 2023

Claude Sonnet 4.5

Jan 2025

1.3 yr newer

Provider Availability

o3-mini is available from Azure, OpenAI. Claude Sonnet 4.5 is available from Anthropic.

o3-mini

azure logo
Azure
Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M
openai logo
OpenAI
Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M

Claude Sonnet 4.5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Less expensive input tokens
Less expensive output tokens
Anthropic
Supports multimodal inputs
Higher GPQA score (83.4% vs 77.2%)
Higher TAU-bench Airline score (70.0% vs 32.4%)
Higher TAU-bench Retail score (86.2% vs 57.6%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
o3-mini
Anthropic
Claude Sonnet 4.5

FAQ

Common questions about o3-mini vs Claude Sonnet 4.5

Claude Sonnet 4.5 significantly outperforms across most benchmarks. o3-mini is made by OpenAI and Claude Sonnet 4.5 is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
o3-mini scores COLLIE: 98.7%, MATH: 97.9%, IFEval: 93.9%, MGSM: 92.0%, AIME 2024: 87.3%. Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%.
o3-mini is 2.7x cheaper for input tokens. o3-mini costs $1.10/M input and $4.40/M output via azure. Claude Sonnet 4.5 costs $3.00/M input and $15.00/M output via anthropic.
o3-mini supports 200K tokens and Claude Sonnet 4.5 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include input pricing ($1.10 vs $3.00/M), multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.
o3-mini is developed by OpenAI and Claude Sonnet 4.5 is developed by Anthropic.