The best AI for developers

Claude is the not-so-secret advantage for world class engineering teams and software companies.

80.3%

Fable 5 leads on SWE-Bench Pro

60x

faster code review feedback for an AI platform customer

95%

reduction in time to run tests for an enterprise software customer

Write code with Claude

Get complete insight into your codebase and accelerate exceptional software.

Prompt

> claude fix the authentication error in our login flow

I'll investigate the auth error. Let me look at the relevant files.

‍

Examining auth-related files...

* src/services/authService.js

* src/components/Login.jsx

* src/store/authSlice.js

‍

Running the login flow...

‍

Error detected: "401 Unauthorized: Token expired"

‍

Root cause:

* Token refresh mechanism not handling expired tokens correctly

* Refresh token missing from request header

* Improper error handling for 401 responses

‍

Updating authService.js with proper refresh logic...

Updating request interceptor for 401 handling...

Testing the fix...

‍

* Login successful ✓

* Token refresh working ✓

* Proper redirection on expired tokens ✓

‍

Authentication error fixed! The login flow now properly handles token expiration.

Scale coding impact, not overhead

Write, test, and debug complex software with Claude, analyze codebases with expert-level reasoning via GitHub integration, delegate development tasks through computer use, and fast-track smarter engineering decisions in a shared workspace.

Explore agentic coding with Claude Code

Claude Code brings Fable 5 to your terminal, with deep codebase awareness and the ability to edit files and run commands directly in your environment.

Developers love Claude

“I taught a friend who has never written code in her life how to use Claude to build a simple app and deploy it on Cloudflare today. Watching someone realize that they can now build software is a great experience. Enable everyone to build anything.”

Logan Grasby, @LoganGrasby

“I introduced someone to Claude Code, Opus last night, and we were up til 4 am building a project. It was crazy! 20K lines of codes, audit logging, a full Prisma Database, complete architecture, and a complete roadmap with 4 phases for complete implementation.”

Teneika Askew, @teneikaask_you

“Just taught my fiancée how to use claude to write code that automates dumb tasks that have been making her work life miserable for months. She went from being downtrodden and skeptical to dancing around the room in about 15 minutes. END USER PROGRAMMING IS NOW.”

Kasey, @kaseyklimes

“I know this sounds cringe, but I literally have clammy hands and a racing heart because of how powerful Claude + Cursor is. Like I just made a whole new feature, frontend and backend, built on top of my own custom APIs without touching code, then I had it switch from a SwiftUI.”

Majd Taby, @jtaby

“Anthropic is leading the Industry with models - like Sonnet and Opus - and developer tools - like Claude Code.”

Jon Meyers, @jonmeyers_io

“With new Claude i officially feel like a fraud when i code, I’m the guy in the corner saying um nice job boss keep going.”

Nick, @nickcammarata

0/5

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Existing prompt

Classify all customer support tickets into the most relevant category.

Here is the list of categories to choose from:
{{CATEGORY_LIST}}

Here is the content of the support ticket:
{{TICKET_CONTENT}}

What would you like to improve?

Please include a rationale for the classification.

You are an AI assistant specialized in classifying customer support tickets. Your task is to analyze the content of a given ticket and assign it to the most appropriate category from a predefined list. You will also provide reasoning for your classification decision.

First, let's review the available categories:

<category_list>
{{CATEGORY_LIST}}
</category_list>

Now, here is the content of the support ticket you need to classify:

<ticket_content>
{{TICKET_CONTENT}}
</ticket_content>

Please follow these steps to complete the task:
– Carefully read and analyze the ticket content.
– Consider how the content relates to each of the available categories.
– Choose the most appropriate category for the ticket.
– Provide a detailed explanation of your reasoning process.

Use the following structure for your response:
<classification_analysis>
In this section, break down your thought process:
– Quote the most relevant parts of the ticket content.
– List each category and note how it relates to the ticket content.
– For each category, provide arguments for and against classifying the ticket into that category.
– Rank the top 3 most likely categories.
</classification_analysis>

<classification>
<category>Your chosen category goes here</category>
<reasoning>A concise summary of your reasoning for choosing this category</reasoning>
</classification>

Remember to be thorough in your analysis and clear in your explanation. Your goal is to provide an accurate classification with well-supported reasoning.

Deliver amazing AI experiences

Customize how Claude fits into your solution with our API
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See why companies choose Claude

"On ViBench, our end-to-end vibe-coding benchmark, Claude Fable 5 is the highest-performing model we've tested — nearly saturating our base use cases and building apps in less time with fewer tokens."

Michele Catasta, President & Head of AI

"Claude Fable 5 is a real step forward for the developers GitHub serves. In our early testing, it took on complex, long-horizon coding tasks with a level of autonomy and reliability that exceeded previous benchmarks. But what excites us most is the direction it points: a future where developers can hand increasingly ambitious work to agents and trust the results across the software lifecycle."

Mario Rodriguez, Chief Product Officer

“Claude Opus 5 is a clear generational step up from Opus 4.8. Over one weekend I gave it a chief-of-staff role over my dev environments: it built its own monitor, drove each box, and pulled me in only for the judgment calls.”

Cristian Rivera, Staff Software Engineer

“On FrontierCode 1.1, Claude Opus 5 approaches Fable-level performance at half the cost. Within Devin, it also shows particular strength on difficult debugging and root-cause analysis tasks.”

Scott Wu, CEO

“Claude Opus 5 delivers near Fable 5 intelligence at Opus speed and cost. On CursorBench it’s just under Fable 5 and has many of the same behaviors. We are excited to see how developers use it in Cursor.”

Sualeh Asif, Co-Founder

"These are the strongest results of any Claude model we've had the opportunity to test. Claude Fable 5 is a clear step forward on agentic coding and prototyping."

Matt Colyer, Director of Product, Developers

"Claude Fable 5 came out #1 on our evals, winning head-to-head against every model we tested. It was significantly stronger on the hardest tasks in the set — UI design and game coding."

Kay Zhu, Co-founder & CTO

0/5