Model Comparison

Claude Sonnet 4.6 vs GPT-5.3 Chat

Comparing Claude Sonnet 4.6 and GPT-5.3 Chat across benchmarks, pricing, and capabilities.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Sonnet 4.6 and GPT-5.3 Chat 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-5.3 Chat costs less

For input processing, Claude Sonnet 4.6 ($3.00/1M tokens) is 1.7x more expensive than GPT-5.3 Chat ($1.75/1M tokens).

For output processing, Claude Sonnet 4.6 ($15.00/1M tokens) is 1.1x more expensive than GPT-5.3 Chat ($14.00/1M tokens).

In conclusion, Claude Sonnet 4.6 is more expensive than GPT-5.3 Chat.*

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

Lowest available price from all providers
Sat Apr 18 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.6
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT-5.3 Chat
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Sonnet 4.6 accepts 200,000 input tokens compared to GPT-5.3 Chat's 128,000 tokens. Claude Sonnet 4.6 can generate longer responses up to 64,000 tokens, while GPT-5.3 Chat is limited to 16,384 tokens.

Anthropic
Claude Sonnet 4.6
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-5.3 Chat
Input128,000 tokens
Output16,384 tokens
Sat Apr 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.6 and GPT-5.3 Chat 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-5.3 Chat

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-5.3 Chat

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.6 was released on 2026-02-17, while GPT-5.3 Chat was released on 2026-03-04.

GPT-5.3 Chat is 1 month newer than Claude Sonnet 4.6.

Claude Sonnet 4.6

Feb 17, 2026

2 months ago

GPT-5.3 Chat

Mar 4, 2026

1 months ago

2w newer

Knowledge Cutoff

When training data ends

GPT-5.3 Chat has a documented knowledge cutoff of 2025-08-31, while Claude Sonnet 4.6's cutoff date is not specified.

We can confirm GPT-5.3 Chat's training data extends to 2025-08-31, but cannot make a direct comparison without Claude Sonnet 4.6's cutoff date.

Claude Sonnet 4.6

—

GPT-5.3 Chat

Aug 2025

Provider Availability

Claude Sonnet 4.6 is available from Anthropic. GPT-5.3 Chat is available from OpenAI.

Claude Sonnet 4.6

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

GPT-5.3 Chat

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
OpenAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.6
OpenAI
GPT-5.3 Chat

FAQ

Common questions about Claude Sonnet 4.6 vs GPT-5.3 Chat

Claude Sonnet 4.6 (Anthropic) and GPT-5.3 Chat (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
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-5.3 Chat scores HealthBench: 54.1%, HealthBench Hard: 25.9%.
GPT-5.3 Chat is 1.7x cheaper for input tokens. Claude Sonnet 4.6 costs $3.00/M input and $15.00/M output via anthropic. GPT-5.3 Chat costs $1.75/M input and $14.00/M output via openai.
Claude Sonnet 4.6 supports 200K tokens and GPT-5.3 Chat 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 $1.75/M). See the full comparison above for benchmark-by-benchmark results.
Claude Sonnet 4.6 is developed by Anthropic and GPT-5.3 Chat is developed by OpenAI.