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Description
Claude Sonnet 5 is Anthropic's newest Sonnet-class language model, built to provide advanced reasoning, coding, autonomous tool use, and agentic workflow capabilities at a lower cost than larger foundation models. The model is capable of planning multi-step tasks, interacting with browsers and terminals, using external tools, and completing sophisticated work with minimal human intervention. Compared to Claude Sonnet 4.6, Sonnet 5 delivers substantial improvements across coding, reasoning, knowledge work, and AI agent performance while narrowing the capability gap with Anthropic's Opus family of models. Anthropic also reports improvements in safety, including lower rates of hallucinations, reduced undesirable behaviors, stronger resistance to prompt injection attacks, and better handling of malicious requests. Developers can access Sonnet 5 through the Claude platform and API using competitive introductory pricing, making it easier to deploy production AI applications without significantly increasing costs. The model supports a wide range of agentic workflows by allowing users to adjust effort levels to balance performance, speed, and token usage for different tasks. Anthropic also expanded usage limits across its services to support more demanding workloads generated by increasingly capable AI agents. Claude Sonnet 5 is positioned as a practical model for organizations that need powerful AI automation without the higher operating costs associated with frontier-scale models. By combining improved intelligence, stronger safety, flexible pricing, and enhanced agentic behavior, Claude Sonnet 5 enables developers to build more autonomous and reliable AI systems.
Description
GPT-5.3 Instant represents a significant refinement of ChatGPT’s core conversational model, prioritizing smoother, more natural interactions. This update directly addresses user feedback about tone, unnecessary refusals, and overly defensive disclaimers. The model now provides more direct answers when safe to do so, minimizing conversational friction and reducing dead ends. It also demonstrates improved judgment when handling sensitive topics, offering balanced responses without moralizing preambles. When using web information, GPT-5.3 Instant better synthesizes search results with its internal knowledge, delivering concise and relevant insights instead of link-heavy summaries. Internal evaluations show meaningful reductions in hallucination rates, particularly in high-stakes domains such as medicine, law, and finance. The model is designed to feel consistent and familiar while offering noticeable capability upgrades. Writing performance has been enhanced, enabling richer storytelling and more expressive prose without sacrificing clarity. These improvements aim to make ChatGPT feel less mechanical and more intuitively helpful in everyday use. GPT-5.3 Instant is available across ChatGPT and through the API, with older versions remaining temporarily accessible before retirement.
API Access
Has API
Yes
API Access
Has API
No
Integrations
Augment Code
Yes
Bash
Yes
C++
Yes
CSS
Yes
Go
Yes
HTML
Yes
Java
Yes
JavaScript
Yes
Kotlin
Yes
PHP
Yes
Integrations
Augment Code
Yes
Bash
Yes
C++
Yes
CSS
Yes
Go
Yes
HTML
Yes
Java
Yes
JavaScript
Yes
Kotlin
Yes
PHP
Yes
Pricing Details
$2 per 1M tokens (input)
$2 per million input tokens and $10 per million output tokens
Free Trial
No
Free Version
No
Pricing Details
No price information available.
Free Trial
No
Free Version
No
Deployment
Web-Based
Yes
On-Premises
No
iPhone App
No
iPad App
No
Android App
No
Windows
No
Mac
No
Linux
No
Chromebook
No
Deployment
Web-Based
Yes
On-Premises
No
iPhone App
No
iPad App
No
Android App
No
Windows
No
Mac
No
Linux
No
Chromebook
No
Customer Support
Business Hours
No
Live Rep (24/7)
No
Online Support
Yes
Customer Support
Business Hours
No
Live Rep (24/7)
No
Online Support
Yes
Types of Training
Training Docs
Yes
Webinars
No
Live Training (Online)
No
In Person
No
Types of Training
Training Docs
Yes
Webinars
No
Live Training (Online)
No
In Person
No
Vendor Details
Company Name
Anthropic
Founded
2021
Country
United States
Website
claude.ai
Vendor Details
Company Name
OpenAI
Founded
2015
Country
United States
Website
openai.com