GPT-5.2 vs Claude Sonnet 4.5 Comparison

Comparing GPT-5.2 and Claude Sonnet 4.5 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

GPT-5.2 outperforms in 3 benchmarks (AIME 2025, GPQA, MMMLU), while Claude Sonnet 4.5 is better at 0 benchmarks.

GPT-5.2 significantly outperforms across most benchmarks.

Tue Mar 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.2 costs less

For input processing, GPT-5.2 ($1.75/1M tokens) is 1.7x cheaper than Claude Sonnet 4.5 ($3.00/1M tokens).

For output processing, GPT-5.2 ($14.00/1M tokens) is 1.1x cheaper than Claude Sonnet 4.5 ($15.00/1M tokens).

In conclusion, Claude Sonnet 4.5 is more expensive than GPT-5.2.*

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

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

GPT-5.2

Input tokens$1.75

Output tokens$14.00

Best providerOpenAI

Claude Sonnet 4.5

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

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Context Window

Maximum input and output token capacity

GPT-5.2 accepts 400,000 input tokens compared to Claude Sonnet 4.5's 200,000 tokens. GPT-5.2 can generate longer responses up to 128,000 tokens, while Claude Sonnet 4.5 is limited to 64,000 tokens.

GPT-5.2

Input400,000 tokens

Output128,000 tokens

Claude Sonnet 4.5

Input200,000 tokens

Output64,000 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.2 and Claude Sonnet 4.5 support multimodal inputs.

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

GPT-5.2

Text

Images

Audio

Video

Claude Sonnet 4.5

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.

GPT-5.2

Proprietary

Closed source

Claude Sonnet 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.2 was released on 2025-12-11, while Claude Sonnet 4.5 was released on 2025-09-29.

GPT-5.2 is 2 months newer than Claude Sonnet 4.5.

GPT-5.2

Dec 11, 2025

3 months ago

2mo newer

Claude Sonnet 4.5

Sep 29, 2025

5 months ago

Knowledge Cutoff

When training data ends

GPT-5.2 has a knowledge cutoff of 2025-08-25, while Claude Sonnet 4.5 has a cutoff of 2025-01-31.

GPT-5.2 has more recent training data (up to 2025-08-25), making it potentially better informed about events through that date compared to Claude Sonnet 4.5 (2025-01-31).

GPT-5.2

Aug 2025

7 mo newer

Claude Sonnet 4.5

Jan 2025

Provider Availability

GPT-5.2 is available from OpenAI. Claude Sonnet 4.5 is available from Anthropic. The availability of providers can affect quality of the model and reliability.