Model Comparison

Claude 3.5 Sonnet vs GPT-5.1 Medium

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
Wed Apr 15 2026 • llm-stats.com
Anthropic
Claude 3.5 Sonnet
Input tokens$3.00
Output tokens$15.00
Best providerAWS Bedrock
OpenAI
GPT-5.1 Medium
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

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.

Anthropic
Claude 3.5 Sonnet
Input200,000 tokens
Output200,000 tokens
OpenAI
GPT-5.1 Medium
Input400,000 tokens
Output128,000 tokens
Wed Apr 15 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

1.8 years ago

GPT-5.1 Medium

Nov 12, 2025

5 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.

Claude 3.5 Sonnet

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

GPT-5.1 Medium

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
OpenAI
Larger context window (400,000 tokens)
Less expensive input tokens
Less expensive output tokens
AnthropicClaude 3.5 Sonnet
OpenAIGPT-5.1 Medium
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3.5 Sonnet
OpenAI
GPT-5.1 Medium

FAQ

Common questions about Claude 3.5 Sonnet vs GPT-5.1 Medium

Claude 3.5 Sonnet (Anthropic) and GPT-5.1 Medium (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
Claude 3.5 Sonnet scores GSM8k: 96.4%, BIG-Bench Hard: 93.1%, HumanEval: 92.0%, MGSM: 91.6%, MMLU: 90.4%. GPT-5.1 Medium scores AIME 2025: 98.4%.
GPT-5.1 Medium is 2.4x cheaper for input tokens. Claude 3.5 Sonnet costs $3.00/M input and $15.00/M output via bedrock. GPT-5.1 Medium costs $1.25/M input and $10.00/M output via openai.
Claude 3.5 Sonnet supports 200K tokens and GPT-5.1 Medium supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 400K), input pricing ($3.00 vs $1.25/M). See the full comparison above for benchmark-by-benchmark results.
Claude 3.5 Sonnet is developed by Anthropic and GPT-5.1 Medium is developed by OpenAI.