Claude Opus 4.5 vs Claude Sonnet 4 Comparison

Comparing Claude Opus 4.5 and Claude Sonnet 4 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude Opus 4.5 outperforms in 3 benchmarks (GPQA, MMMLU, SWE-Bench Verified), while Claude Sonnet 4 is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Tue Mar 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Sonnet 4 costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 1.7x more expensive than Claude Sonnet 4 ($3.00/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 1.7x more expensive than Claude Sonnet 4 ($15.00/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than Claude Sonnet 4.*

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

Lowest available price from all providers
Tue Mar 17 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Anthropic
Claude Sonnet 4
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. Both models can generate responses up to 64,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Anthropic
Claude Sonnet 4
Input200,000 tokens
Output64,000 tokens
Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Claude Sonnet 4 support multimodal inputs.

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

Claude Opus 4.5

Text
Images
Audio
Video

Claude Sonnet 4

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 Opus 4.5

Proprietary

Closed source

Claude Sonnet 4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Claude Sonnet 4 was released on 2025-05-22.

Claude Opus 4.5 is 6 months newer than Claude Sonnet 4.

Claude Opus 4.5

Nov 24, 2025

3 months ago

6mo newer
Claude Sonnet 4

May 22, 2025

9 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Claude Sonnet 4's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Claude Sonnet 4's cutoff date.

Claude Opus 4.5

Mar 2025

Claude Sonnet 4

—

Provider Availability

Claude Opus 4.5 is available from Anthropic. Claude Sonnet 4 is available from Anthropic, Bedrock, Google. The availability of providers can affect quality of the model and reliability.

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

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
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Higher GPQA score (87.0% vs 75.4%)
Higher MMMLU score (90.8% vs 86.5%)
Higher SWE-Bench Verified score (80.9% vs 72.7%)
Anthropic
Less expensive input tokens
Less expensive output tokens
AnthropicClaude Opus 4.5
AnthropicClaude Sonnet 4
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Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Anthropic
Claude Sonnet 4