Claude 3 Sonnet vs o3 Comparison

Comparing Claude 3 Sonnet and o3 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude 3 Sonnet outperforms in 0 benchmarks, while o3 is better at 1 benchmark (GPQA).

o3 significantly outperforms across most benchmarks.

Sat Mar 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o3 costs less

For input processing, Claude 3 Sonnet ($3.00/1M tokens) is 1.5x more expensive than o3 ($2.00/1M tokens).

For output processing, Claude 3 Sonnet ($15.00/1M tokens) is 1.9x more expensive than o3 ($8.00/1M tokens).

In conclusion, Claude 3 Sonnet is more expensive than o3.*

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

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

Claude 3 Sonnet

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

Input tokens$2.00

Output tokens$8.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Both models have the same input context window of 200,000 tokens. Claude 3 Sonnet can generate longer responses up to 200,000 tokens, while o3 is limited to 100,000 tokens.

Claude 3 Sonnet

Input200,000 tokens

Output200,000 tokens

Input200,000 tokens

Output100,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3 Sonnet and o3 support multimodal inputs.

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

Claude 3 Sonnet

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.

Claude 3 Sonnet

Proprietary

Closed source

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3 Sonnet was released on 2024-02-29, while o3 was released on 2025-04-16.

o3 is 14 months newer than Claude 3 Sonnet.

Claude 3 Sonnet

Feb 29, 2024

2.0 years ago

Apr 16, 2025

11 months ago

1.1yr newer

Knowledge Cutoff

When training data ends

o3 has a documented knowledge cutoff of 2024-05-31, while Claude 3 Sonnet's cutoff date is not specified.

We can confirm o3's training data extends to 2024-05-31, but cannot make a direct comparison without Claude 3 Sonnet's cutoff date.

Claude 3 Sonnet

—

May 2024

Provider Availability

Claude 3 Sonnet is available from Anthropic, Bedrock, Google. o3 is available from OpenAI. The availability of providers can affect quality of the model and reliability.