Introducing 'Claude Sonnet 4.5,' an AI model with better coding ability than GPT-5



AI development company Anthropic announced its AI model, Claude Sonnet 4.5 , on September 30, 2025. Claude Sonnet 4.5 has been shown to have higher coding performance than GPT-5 and Gemini 2.5 Pro, and Anthropic is promoting it as 'the world's best coding model.'

Introducing Claude Sonnet 4.5 \ Anthropic

https://www.anthropic.com/news/claude-sonnet-4-5

Enabling Claude Code to work more autonomously \ Anthropic
https://www.anthropic.com/news/enabling-claude-code-to-work-more-autonomously

Below is a table summarizing the various benchmark results for 'Claude Sonnet 4.5', 'Claude Opus 4.1', 'Claude Sonnet 4', 'GPT-5', and 'Gemini 2.5 Pro'. Claude Sonnet 4.5 recorded the highest scores in most tests.



The results of the coding ability benchmark test '

SWE-bench Verified ' developed by OpenAI are as follows. Claude Sonnet 4.5 not only outperforms GPT-5 and Gemini 2.5 Pro, but also shows better performance than the coding-specific model ' GPT-5-Codex .' In addition, it has a track record of running for more than 30 hours on complex tasks.



It also took the top spot in the

OSWorld benchmark test, which measures AI PC operation capabilities, with a score of 61.4%. In the demo video below, you can see how Chrome is operated using Claude for Chrome with Claude Sonnet 4.5.

Claude for Chrome brings AI where you're already working (Instrumental) - YouTube


Claude Sonnet 4.5 also features a lower risk of misbehavior, such as deception, subservience, power-seeking, fostering delusions, and obedience to harmful system prompts. The graph below shows the risk of misbehavior for various AIs, with Claude Sonnet 4.5 showing the lowest risk.



Claude Sonnet 4.5

API fees are $3 per million tokens for inputs of 200,000 or less, $6 per million tokens for inputs of over 200,000, $15 per million tokens for outputs of 200,000 or less, and $22.50 per million tokens for outputs of over 200,000.



In addition, Anthropic has also released a preview version for researchers of 'Imagine with Claude,' a service that allows you to create software in real time using Claude Sonnet 4.5.

An experimental new way to design software - YouTube


Additionally, Claude Sonnet 4.5 is now available for use with the extension ' Claude Code for VS Code ,' which allows you to use the coding agent 'Claude Code' with Visual Studio Code. You can see an example of how it works in the video below.

Claude Code is available in VS Code - YouTube


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