Model Comparison

Claude Sonnet 4.6 vs GPT-4o

Claude Sonnet 4.6 significantly outperforms across most benchmarks. GPT-4o is 1.4x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Claude Sonnet 4.6 outperforms in 7 benchmarks (GPQA, Humanity's Last Exam, MMMLU, MMMU-Pro, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while GPT-4o is better at 0 benchmarks.

Claude Sonnet 4.6 significantly outperforms across most benchmarks.

Tue Apr 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-4o costs less

For input processing, Claude Sonnet 4.6 ($3.00/1M tokens) is 1.2x more expensive than GPT-4o ($2.50/1M tokens).

For output processing, Claude Sonnet 4.6 ($15.00/1M tokens) is 1.5x more expensive than GPT-4o ($10.00/1M tokens).

In conclusion, Claude Sonnet 4.6 is more expensive than GPT-4o.*

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

Lowest available price from all providers
Tue Apr 21 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.6
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
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Context Window

Maximum input and output token capacity

Claude Sonnet 4.6 accepts 200,000 input tokens compared to GPT-4o's 128,000 tokens. Claude Sonnet 4.6 can generate longer responses up to 64,000 tokens, while GPT-4o is limited to 16,384 tokens.

Anthropic
Claude Sonnet 4.6
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-4o
Input128,000 tokens
Output16,384 tokens
Tue Apr 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.6 and GPT-4o support multimodal inputs.

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

Claude Sonnet 4.6

Text
Images
Audio
Video

GPT-4o

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 4.6

Proprietary

Closed source

GPT-4o

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.6 was released on 2026-02-17, while GPT-4o was released on 2024-08-06.

Claude Sonnet 4.6 is 19 months newer than GPT-4o.

Claude Sonnet 4.6

Feb 17, 2026

2 months ago

1.5yr newer
GPT-4o

Aug 6, 2024

1.7 years ago

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 Sonnet 4.6 is available from Anthropic. GPT-4o is available from Azure, OpenAI.

Claude Sonnet 4.6

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

GPT-4o

azure logo
Azure
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher GPQA score (89.9% vs 70.1%)
Higher Humanity's Last Exam score (49.0% vs 5.3%)
Higher MMMLU score (89.3% vs 81.4%)
Higher MMMU-Pro score (75.6% vs 59.9%)
Higher SWE-Bench Verified score (79.6% vs 33.2%)
Higher Tau2 Retail score (91.7% vs 63.4%)
Higher Tau2 Telecom score (97.9% vs 23.5%)
OpenAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.6
OpenAI
GPT-4o

FAQ

Common questions about Claude Sonnet 4.6 vs GPT-4o

Claude Sonnet 4.6 significantly outperforms across most benchmarks. Claude Sonnet 4.6 is made by Anthropic and GPT-4o is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Sonnet 4.6 scores Tau2 Telecom: 97.9%, Tau2 Retail: 91.7%, GPQA: 89.9%, MMMLU: 89.3%, SWE-Bench Verified: 79.6%. GPT-4o scores AI2D: 94.2%, DocVQA: 92.8%, ChartQA: 85.7%, MMLU: 85.7%, CharXiv-D: 85.3%.
GPT-4o is 1.2x cheaper for input tokens. Claude Sonnet 4.6 costs $3.00/M input and $15.00/M output via anthropic. GPT-4o costs $2.50/M input and $10.00/M output via azure.
Claude Sonnet 4.6 supports 200K tokens and GPT-4o supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 128K), input pricing ($3.00 vs $2.50/M). See the full comparison above for benchmark-by-benchmark results.
Claude Sonnet 4.6 is developed by Anthropic and GPT-4o is developed by OpenAI.