Preview
We track 20 posts about Preview from 8 engineering blogs. Most active: Real Python, Laravel, Vercel. Latest post: Oct 8, 2026.
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Recent posts
Step 5 Preview now available on AI Gateway (opens on the source site)
Vercel ·
Step 5 Preview, StepFun's flagship model, is now available on AI Gateway. It's built for agentic coding, professional knowledge work, and financial analysis, from building apps and debugging code to research and analytical reports. Step 5 Preview supports text and image input with a 1M-token context window, allowing you to work with large codebases, a stack of documents, or screenshots and charts in a single request. Use stepfun/step-5-preview as the model name: For other coding agents such as Claude Code, Codex, Cursor, and more, install the latest Vercel CLI and run setup: Then select…
Announcing AWS Well-Architected Agent, an AI-powered intelligence to optimize your cloud environment (preview) (opens on the source site)
AWS ·
Introducing the public preview of AWS Well-Architected Agent, an AI-powered service that analyzes your AWS environment to deliver targeted, contextual recommendations for improving your applications' cost, security, performance, and resilience—with ready-to-implement fixes aligned to your business goals.
Mailbox for Laravel: Preview and Test Rendered Email (opens on the source site)
Laravel ·
Mailbox for Laravel captures outgoing mail in a local dashboard and lets you test rendered HTML, recipients, and attachments with fluent assertions. The post Mailbox for Laravel: Preview and Test Rendered Email appeared first on Laravel News. Join the Laravel Newsletter to get Laravel articles like this directly in your inbox.
Python 3.15 Preview: Sentinel Values (opens on the source site)
Sometimes your code needs to pass along a signal, like “no argument was passed” or “the stream has ended,” in the same place where it normally receives data. Any ordinary value you pick for that job, even None, might also show up as real data. That’s why, in Python, you’ve probably written or seen something like _MISSING = object() to create a sentinel value that your code treats as a signal rather than as data. That idiom works, but its default representation clutters function signatures, provides no useful information to static type checkers, and fails identity checks after copying. Other…
Quiz: Python 3.15 Preview: Sentinel Values (opens on the source site)
In this quiz, you’ll test your understanding of Python 3.15 Preview: Sentinel Values. By working through this quiz, you’ll revisit what sentinel values are, where the classic object() idiom falls short, and how Python 3.15’s built-in sentinel type gives you readable signatures, precise type hints, and identity that survives copying and pickling. You’ll also practice deciding when a sentinel beats None, so you’ll know exactly which object() markers in your own code are worth replacing once you upgrade. [ Improve Your Python With 🐍 Python Tricks 💌 – Get a short & sweet Python Trick delivered…
Python 3.15 Preview: frozendict (opens on the source site)
Preview Python 3.15's frozendict: build immutable mappings you can hash, cache, and share across threads, and learn where the freeze stops.
Quiz: Python 3.15 Preview: frozendict (opens on the source site)
In this quiz, you’ll test your understanding of Python 3.15 Preview: frozendict. By working through this quiz, you’ll revisit how to build a frozen mapping, why it isn’t a dict subclass, what it takes to make one hashable, and exactly where the freeze stops. Python 3.15 finally gives dictionaries the immutable counterpart that lists and sets have had for years. [ Improve Your Python With 🐍 Python Tricks 💌 – Get a short & sweet Python Trick delivered to your inbox every couple of days. >> Click here to learn more and see examples ]
Preview Blade Templates in macOS Finder with Quick Blade (opens on the source site)
Laravel ·
Quick Blade is a free macOS Quick Look extension that renders .blade.php files in Finder with your layout, compiled CSS, and stand-in data. The post Preview Blade Templates in macOS Finder with Quick Blade appeared first on Laravel News. Join the Laravel Newsletter to get Laravel articles like this directly in your inbox.
Python 3.15 Preview: Lazy Imports (opens on the source site)
Learn how Python 3.15 lazy imports work, how deferring heavy modules cuts your app's startup time, and which imports still have to stay eager.
Quiz: Python 3.15 Preview: Lazy Imports (opens on the source site)
Test your understanding of Python 3.15 lazy imports, from the lazy keyword and __lazy_modules__ to the imports that have to stay eager.
Python 3.15 Preview: UTF-8 by Default (opens on the source site)
Preview the Python 3.15 UTF-8 default: see what changes, try it on a pre-release, and keep your file I/O portable across every platform.
Quiz: Python 3.15 Preview: UTF-8 by Default (opens on the source site)
Test your understanding of Python 3.15's UTF-8 default, from the origins of the old locale-based encoding to passing explicit encodings in your code.
Hy4 Preview now available on AI Gateway (opens on the source site)
Vercel ·
Hy4 Preview from Tencent is now available on AI Gateway. Hy4 Preview is an open-source Mixture-of-Experts model with 770B total parameters and 49B active per token, aimed at long-horizon coding, document analysis, game development, and scientific reasoning. It serves a context window of 1M tokens. To use Hy4 Preview, set model to tencent/hy4-preview in the AI SDK: import { streamText } from 'ai'; const result = streamText({ model: 'tencent/hy4-preview', prompt: 'Add pagination to the results endpoint.', }); To use it in a coding agent, see the coding agents guide, then run vercel ai-gateway…
Python 3.15 Preview: Sampling Profiler (opens on the source site)
Explore Python 3.15's new sampling profiler and learn low-overhead profiling of scripts, threads, and live production processes.
Quiz: Python 3.15 Preview: Sampling Profiler (opens on the source site)
Test your understanding of Python 3.15's new sampling profiler, from CPU and GIL modes to flame graphs, heatmaps, and attaching to a live process.
Quiz: Python 3.12 Preview: Static Typing Improvements (opens on the source site)
Test your grasp of Python 3.12 static typing. Practice the new type variable syntax, the @override decorator, and typed dictionaries.
Explore new features available in C# 15 preview (opens on the source site)
.NET ·
C# 15 ships with .NET 11. It adds union types, closed hierarchies, a preview of the updated unsafe model, and a few smaller changes that remove everyday ceremony. The post Explore new features available in C# 15 preview appeared first on .NET Blog.
Check out the New Node.js API Documentation Preview (opens on the source site)
Node.js ·
Guilherme Araújo We've been rebuilding how Node.js generates and presents its API documentation, and a preview is now live at beta.docs.nodejs.org. Before it becomes the default, we want as many people as possible to use it for real work and tell us what you think. What's different for readers The content itself hasn't changed: every page is generated from the same Markdown files in the nodejs/node repository that power the current docs. The features you rely on today made the trip too: light and dark themes, ESM/CJS switching and copy buttons on snippets, stability badges, version history,…
Preview ESC Changes with Environment Overrides (opens on the source site)
Pulumi ·
Pulumi ESC makes it easy to store configuration and secrets for your Pulumi programs, and with Approvals for ESC you can review and approve changes before they go live. The new --override-env flag lets you preview any environment change, including an unapproved draft, to see exactly how it would affect your stack before it becomes the latest version. Example scenario Your team stores production app configuration in ESC and has enabled Approvals to keep bad values out of critical infrastructure. But one important question remains: how can reviewers properly validate a configuration change…
Behind the Scenes Hardening Firefox with Claude Mythos Preview (opens on the source site)
Two weeks ago we announced that we had identified and fixed an unprecedented number of latent security bugs in Firefox with the help of Claude Mythos Preview and other AI models. In this post, we’ll go into more detail about how we approached this work, what we found, and advice for other projects on making […] The post Behind the Scenes Hardening Firefox with Claude Mythos Preview appeared first on Mozilla Hacks - the Web developer blog.
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