How-Tos & Practical Guides

The clock is ticking. Anthropic announced back on April 14, 2026 that claude-sonnet-4-20250514 and claude-opus-4-20250514 would be retired from the API — and that retirement happens on June 15, 2026 at 9AM PT. There is no grace period. When the clock hits, API calls using these model IDs will error immediately. If you haven’t migrated yet, you have five days. Here’s your checklist. What’s Being Retired Model ID (retiring) Retirement date Recommended replacement claude-sonnet-4-20250514 June 15, 2026 9AM PT claude-sonnet-4-6 claude-opus-4-20250514 June 15, 2026 9AM PT claude-opus-4-6, claude-opus-4-7, or claude-opus-4-8 Note: GitHub Copilot already deprecated Sonnet 4 in May 2026. If you’re on Copilot, that may already be resolved, but double-check any API integrations you maintain separately. ...

At WWDC 2026 (June 8–9), Apple introduced one of the most significant expansions to its AI developer toolkit yet: the Foundation Models framework now supports third-party LLMs, including Claude and Gemini, through a unified Swift API. This means developers can now swap between on-device Apple models and cloud-hosted Anthropic or Google models using the same code — no per-provider API wrappers required. This is a meaningful development for agentic iOS app builders. The same LanguageModel protocol that powers on-device Apple Intelligence now works with Claude and Gemini. ...

Anthropic dropped something big on June 9, 2026: Claude Fable 5, the first publicly available Mythos-class model — and its access-gated sibling, Claude Mythos 5, available through Project Glasswing. These aren’t incremental upgrades. Fable 5 achieves 95.00% ±0.98 on SWE-bench Verified and 80.3% on SWE-bench Pro, both current leaderboard leaders. It has a 1 million token context window with up to 128K output tokens per request. If you run agentic pipelines, this is the model your architecture has been waiting for. ...

OpenClaw shipped its June 2026 stable release — v2026.6.5 — on June 9, 2026, and it’s the most feature-complete stable release in the platform’s history. The headline additions are parallel web search as a first-class bundled provider, a new YYYY.M.PATCH monthly versioning scheme, and a significant hardening of MCP tool handling and auth durability. If you run OpenClaw for serious agentic work, this is a mandatory upgrade. New Monthly Versioning Scheme OpenClaw has shifted from semantic versioning to a YYYY.M.PATCH scheme starting with this release. Version 2026.6.5 means: year 2026, month 6 (June), patch 5. This change better reflects OpenClaw’s release cadence — monthly stable releases with patch-level fixes between them. You’ll no longer need to interpret semantic major/minor version bumps; the date tells you everything about when the release shipped. ...

Something quietly extraordinary happened to Claude Code between January and June 2026. It arrived in that window as a fast, capable coding assistant — you opened a terminal, typed a prompt, got code back. It’s leaving as something structurally different: an unattended agent runtime capable of running hundreds of autonomous sessions in parallel, persisting across terminal closures, routing itself to the cloud, and spinning up sub-fleets of worker agents without a human in the loop. ...

Boris Cherny hasn’t written a single line of code by hand in eight months. That’s not a personal quirk — it’s a deliberate, methodical shift in how the creator and head of Anthropic’s Claude Code thinks about the act of software development itself. Speaking at the 25th annual Fortune Brainstorm Tech conference in Aspen on June 8, 2026, Cherny described a world that would have sounded like science fiction eighteen months ago: on a typical morning, he’s managing a few hundred AI agents doing work on his behalf. On busy days, that number can stretch into the thousands — or tens of thousands. ...

Ask ten different engineers what’s in their AI agent stack and you’ll get ten different answers — often with the same tools stacked in completely different orders for completely different reasons. O’Reilly Radar’s Paolo Perrone has done something genuinely useful with the 2026 edition of “The AI Agents Stack”: he’s cut through the noise with a six-layer framework that maps every component from raw LLM inference to production-ready deployment. Published June 8, 2026, the piece is aimed squarely at engineers who are past the demo stage and wrestling with what it actually takes to run agents reliably. The six-layer framework is both a diagnostic tool and an architectural guide — and it comes with an unusually blunt warning: most teams over-engineer early, and the biggest source of demo-to-production failure isn’t picking the wrong model. It’s adding complexity you don’t yet need. ...

Microsoft Build 2026 produced a lot of announcements. Most of them faded within hours. One didn’t: Anthropic’s Claude is now available as an agentic AI option inside Microsoft Excel — the spreadsheet application used by an estimated 750 million people worldwide. This is not a minor add-in or a chatbot tacked onto a toolbar. It’s Claude operating as an Excel Agent — a system capable of performing multi-step, agentic workflows inside the world’s most-used data tool. And understanding what that actually means, and how it works, is worth your time. ...

At Build 2026, Microsoft announced something that should immediately land on the radar of every developer building with AI agents: built-in MCP for Azure App Service is now in public preview. The premise is simple, the implications are large. If you already host a REST API on Azure App Service, you can now expose it as a Model Context Protocol (MCP) server — accessible to any AI agent or assistant — without writing a single line of MCP-specific code. ...

If you use Google’s Gemini CLI, you have until June 18, 2026 to migrate. After that date, consumer Gemini CLI access ends — and if you’re using the Gemini Code Assist GitHub app, it’s deprecated June 18 and fully shuts down July 17. This isn’t a soft deprecation with years of runway. It’s a hard cutoff. The replacement is Google Antigravity CLI, command: agy. Here’s what you need to know. Why Google Is Making This Change Google shipped Gemini CLI in 2025 and it gathered serious adoption: over 100,000 GitHub stars, 6,000 merged pull requests, and millions of users. But the original design targeted simpler agentic workflows, and developers outgrew it. ...