A Claude Opus 5.5 migration looks like a one-line change. Swap claude-opus-5 for claude-opus-5-5, redeploy, enjoy the lower price. For a plain chat integration that is roughly true. For anything that uses tools, manages conversation history, or streams output to a user, it is not. Anthropic's what's new page lists four breaking changes, each of which returns a 400 error for a request pattern that worked on Opus 5.

Agent configuration management barely exists as a practice. Ask a team running three AI agents in production where the system prompts live and the honest answer is usually a console text box, a .env file, and somebody's laptop. No diff. No review. No rollback. No record of who changed the instruction that changed the behavior. That is not a criticism of anyone.

SAP TechEd 2025 introduces groundbreaking AI advancements empowering developers with tools to transform business data into actionable insights, fueling innovation across industries.

Muse Code is Meta's terminal coding agent, released in beta on 5 August 2026 by Meta Superintelligence Labs. It runs on Muse Spark 1.2, a coding-focused model that shipped the same day, and Meta is selling it on price rather than on capability. That is not a critic's reading. It is Mark Zuckerberg's own framing, and it is the most interesting thing about the release, because it tells you where coding agents are in their product cycle.

OpenAI Codex is the hardest name in developer tooling to write about accurately, because it has denoted three genuinely different products since 2021 and most explanations quietly blend them. Today it is a coding agent product line spanning a desktop app, a command line tool, IDE extensions, a cloud service, GitHub and Chrome. It is not a model. Understanding that, and the two things the name used to mean, is most of what you need before evaluating it.

Async tool calling went generally available in OpenAI's Responses API on September 3, 2026, alongside mid-turn steering and an opt-in replacement for context compaction in Codex. It received almost none of the coverage that the benchmark table on the same announcement page did. That is the wrong way round. The benchmark numbers describe a model that most organizations cannot access yet.

GPT-6 Astra landed on September 3, 2026, and the announcement page is doing several jobs at once. Some of what it describes is generally available in the API today. Some is capability-complete but gated behind a limited rollout. Some is behind an opt-in flag in a config file. And some is a name attached to a plan with no date, no criteria, and no definition.

OpenAI announced late on Friday, August 28, 2026 that it is ending developer access to its models inside Cursor, with a proposed shutoff date of November 12. The trigger was SpaceX completing its $60 billion acquisition of Anysphere, Cursor's parent company, on August 14. The reason OpenAI gave was not technical, not commercial, and not about anything Cursor did. This piece covers what OpenAI actually said, the number that deflates the panic around it, why the…