Claude Sonnet 4 vs o3-pro Comparison

Comparing Claude Sonnet 4 and o3-pro across benchmarks, pricing, and capabilities.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Sonnet 4 and o3-pro don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Sonnet 4 costs less

For input processing, Claude Sonnet 4 ($3.00/1M tokens) is 6.7x cheaper than o3-pro ($20.00/1M tokens).

For output processing, Claude Sonnet 4 ($15.00/1M tokens) is 5.3x cheaper than o3-pro ($80.00/1M tokens).

In conclusion, o3-pro is more expensive than Claude Sonnet 4.*

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

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

Claude Sonnet 4

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

o3-pro

Input tokens$20.00

Output tokens$80.00

Best providerOpenAI

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-pro can generate longer responses up to 100,000 tokens, while Claude Sonnet 4 is limited to 64,000 tokens.

Claude Sonnet 4

Input200,000 tokens

Output64,000 tokens

o3-pro

Input200,000 tokens

Output100,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4 and o3-pro support multimodal inputs.

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

Claude Sonnet 4

Text

Images

Audio

Video

o3-pro

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

Proprietary

Closed source

o3-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4 was released on 2025-05-22, while o3-pro was released on 2025-06-10.

o3-pro is 1 month newer than Claude Sonnet 4.

Claude Sonnet 4

May 22, 2025

9 months ago

o3-pro

Jun 10, 2025

9 months ago

2w newer

Knowledge Cutoff

When training data ends

o3-pro has a documented knowledge cutoff of 2024-05-31, while Claude Sonnet 4's cutoff date is not specified.

We can confirm o3-pro's training data extends to 2024-05-31, but cannot make a direct comparison without Claude Sonnet 4's cutoff date.

Claude Sonnet 4

—

o3-pro

May 2024

Provider Availability

Claude Sonnet 4 is available from Anthropic, Bedrock, Google. o3-pro is available from OpenAI. The availability of providers can affect quality of the model and reliability.