Model Comparison

Claude Sonnet 4 vs o3

o3 shows notably better performance in the majority of benchmarks. o3 is 1.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Sonnet 4 outperforms in 1 benchmarks (SWE-Bench Verified), while o3 is better at 3 benchmarks (AIME 2025, GPQA, MMMU).

o3 shows notably better performance in the majority of benchmarks.

Tue Apr 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o3 costs less

For input processing, Claude Sonnet 4 ($3.00/1M tokens) is 1.5x more expensive than o3 ($2.00/1M tokens).

For output processing, Claude Sonnet 4 ($15.00/1M tokens) is 1.9x more expensive than o3 ($8.00/1M tokens).

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

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

Lowest available price from all providers
Tue Apr 14 2026 • llm-stats.com
Anthropic
Claude Sonnet 4
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
o3
Input tokens$2.00
Output tokens$8.00
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 can generate longer responses up to 100,000 tokens, while Claude Sonnet 4 is limited to 64,000 tokens.

Anthropic
Claude Sonnet 4
Input200,000 tokens
Output64,000 tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Tue Apr 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4 and o3 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

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

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4 was released on 2025-05-22, while o3 was released on 2025-04-16.

Claude Sonnet 4 is 1 month newer than o3.

Claude Sonnet 4

May 22, 2025

10 months ago

1mo newer
o3

Apr 16, 2025

12 months ago

Knowledge Cutoff

When training data ends

o3 has a documented knowledge cutoff of 2024-05-31, while Claude Sonnet 4'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 Sonnet 4's cutoff date.

Claude Sonnet 4

—

o3

May 2024

Provider Availability

Claude Sonnet 4 is available from Anthropic, Bedrock, Google. o3 is available from OpenAI.

Claude Sonnet 4

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
google logo
Google
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

o3

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $8.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Higher SWE-Bench Verified score (72.7% vs 69.1%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Higher AIME 2025 score (86.4% vs 70.5%)
Higher GPQA score (83.3% vs 75.4%)
Higher MMMU score (82.9% vs 74.4%)
AnthropicClaude Sonnet 4
OpenAIo3
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4
OpenAI
o3

FAQ

Common questions about Claude Sonnet 4 vs o3

o3 shows notably better performance in the majority of benchmarks. Claude Sonnet 4 is made by Anthropic and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Sonnet 4 scores MMMLU: 86.5%, TAU-bench Retail: 80.5%, GPQA: 75.4%, MMMU: 74.4%, SWE-Bench Verified: 72.7%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.
o3 is 1.5x cheaper for input tokens. Claude Sonnet 4 costs $3.00/M input and $15.00/M output via anthropic. o3 costs $2.00/M input and $8.00/M output via openai.
Claude Sonnet 4 supports 200K tokens and o3 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include input pricing ($3.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.
Claude Sonnet 4 is developed by Anthropic and o3 is developed by OpenAI.