Model Comparison

Claude Sonnet 4.5 vs GPT-4

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is 6.3x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while GPT-4 is better at 0 benchmarks.

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Tue May 12 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Sonnet 4.5 costs less

For input processing, Claude Sonnet 4.5 ($3.00/1M tokens) is 10.0x cheaper than GPT-4 ($30.00/1M tokens).

For output processing, Claude Sonnet 4.5 ($15.00/1M tokens) is 4.0x cheaper than GPT-4 ($60.00/1M tokens).

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

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

Lowest available price from all providers
Tue May 12 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT-4
Input tokens$30.00
Output tokens$60.00
Best providerAzure
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Sonnet 4.5 accepts 200,000 input tokens compared to GPT-4's 32,768 tokens. Claude Sonnet 4.5 can generate longer responses up to 64,000 tokens, while GPT-4 is limited to 32,768 tokens.

Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-4
Input32,768 tokens
Output32,768 tokens
Tue May 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.5 and GPT-4 support multimodal inputs.

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

Claude Sonnet 4.5

Text
Images
Audio
Video

GPT-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 Sonnet 4.5

Proprietary

Closed source

GPT-4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while GPT-4 was released on 2023-06-13.

Claude Sonnet 4.5 is 28 months newer than GPT-4.

Claude Sonnet 4.5

Sep 29, 2025

7 months ago

2.3yr newer
GPT-4

Jun 13, 2023

2.9 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a knowledge cutoff of 2025-01-31, while GPT-4 has a cutoff of 2022-12-31.

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 GPT-4 (2022-12-31).

Claude Sonnet 4.5

Jan 2025

2.1 yr newer
GPT-4

Dec 2022

Provider Availability

Claude Sonnet 4.5 is available from Anthropic. GPT-4 is available from Azure, OpenAI.

Claude Sonnet 4.5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

GPT-4

azure logo
Azure
Input Price:Input: $30.00/1MOutput Price:Output: $60.00/1M
openai logo
OpenAI
Input Price:Input: $30.00/1MOutput Price:Output: $60.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (83.4% vs 35.7%)
OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
OpenAI
GPT-4

FAQ

Common questions about Claude Sonnet 4.5 vs GPT-4.

Which is better, Claude Sonnet 4.5 or GPT-4?

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is made by Anthropic and GPT-4 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 4.5 compare to GPT-4 in benchmarks?

Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%. GPT-4 scores AI2 Reasoning Challenge (ARC): 96.3%, HellaSwag: 95.3%, Uniform Bar Exam: 90.0%, SAT Math: 89.0%, LSAT: 88.0%.

Is Claude Sonnet 4.5 cheaper than GPT-4?

Claude Sonnet 4.5 is 10.0x cheaper for input tokens. Claude Sonnet 4.5 costs $3.00/M input and $15.00/M output via anthropic. GPT-4 costs $30.00/M input and $60.00/M output via azure.

What are the context window sizes for Claude Sonnet 4.5 and GPT-4?

Claude Sonnet 4.5 supports 200K tokens and GPT-4 supports 33K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 4.5 and GPT-4?

Key differences include context window (200K vs 33K), input pricing ($3.00 vs $30.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 4.5 and GPT-4?

Claude Sonnet 4.5 is developed by Anthropic and GPT-4 is developed by OpenAI.