Claude 3.5 Sonnet vs GPT-5.1 Medium Comparison

Comparing Claude 3.5 Sonnet and GPT-5.1 Medium across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude 3.5 Sonnet and GPT-5.1 Medium don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.1 Medium costs less

For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 2.4x more expensive than GPT-5.1 Medium ($1.25/1M tokens).

For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 1.5x more expensive than GPT-5.1 Medium ($10.00/1M tokens).

In conclusion, Claude 3.5 Sonnet is more expensive than GPT-5.1 Medium.*

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

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

Claude 3.5 Sonnet

Input tokens$3.00

Output tokens$15.00

Best providerAWS Bedrock

GPT-5.1 Medium

Input tokens$1.25

Output tokens$10.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.1 Medium accepts 400,000 input tokens compared to Claude 3.5 Sonnet's 200,000 tokens. Claude 3.5 Sonnet can generate longer responses up to 200,000 tokens, while GPT-5.1 Medium is limited to 128,000 tokens.

Claude 3.5 Sonnet

Input200,000 tokens

Output200,000 tokens

GPT-5.1 Medium

Input400,000 tokens

Output128,000 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3.5 Sonnet and GPT-5.1 Medium support multimodal inputs.

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

Claude 3.5 Sonnet

Text

Images

Audio

Video

GPT-5.1 Medium

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 3.5 Sonnet

Proprietary

Closed source

GPT-5.1 Medium

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3.5 Sonnet was released on 2024-06-21, while GPT-5.1 Medium was released on 2025-11-12.

GPT-5.1 Medium is 17 months newer than Claude 3.5 Sonnet.

Claude 3.5 Sonnet

Jun 21, 2024

1.7 years ago

GPT-5.1 Medium

Nov 12, 2025

4 months ago

1.4yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude 3.5 Sonnet is available from Bedrock, Google. GPT-5.1 Medium is available from OpenAI. The availability of providers can affect quality of the model and reliability.