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Opus 5.5 Clears a Stalled Port; the Assembly Speedup Has a Narrow Benchmark
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Two practitioners report Opus 5.5 completing major language translations, while the linked `ttfx` PR gives a testable, decrypt-specific speed result rather than a general coding benchmark. The brief pairs that signal with concrete practices for scoping long runs, verifying agents, and evaluating new developer tools.

🔥 TOP SIGNAL

Long-horizon code translation is the strongest signal. Theo says Opus 5.5 got his four-month, on-and-off TypeScript-compiler-to-Rust port working in 10 hours, after GPT-5.6 Sol and GPT-6 Astra plateaued at roughly 35% and 85% of tests passing. DHH separately says Opus 5.5 translated Omarchy’s ttfx from Rust to x86-64 assembly and claims up to 17× faster. The linked PR reports 14.5× on one decrypt test (371→25.5 ms) and separately lists 32.5 ms versus Rust’s 371 ms, with 206/206 oracle cases matching—strong project-specific evidence, not a general coding benchmark.

⚡ TRY THIS

  • Give long runs a finish line and a quality target. Theo’s exact request: /goal finish the port and make it faster. Peter Steinberger used /goal with Astra to move OpenClaw off synchronous SQLite after it became limiting with one agent running 50 sessions in parallel; he reports 575 PRs landed so far, with improvements shipped along the way.

  • Make review adversarial and isolated. Steinberger’s auto-review skill starts a fresh-context reviewer, feeds its findings back to the writer, and repeats; then the agent gets a separate test box to install the app, inspect the UI, and verify it end to end. He says this can turn a 10-minute PR into two hours, but lets him parallelize about 20 tasks—reserve the extra validation for changes where it pays back.

  • Turn Slack bug reports into repro-to-PR jobs. Boris Cherny says Claude Tag writes more than 50% of his PRs each day; his prompt is: “@Claude from now on, attempt to repro every bug in this channel end to end, running the full app. Once you reproduce the bug, put up a PR to fix it and tag the right team for code review.” Claude Tag’s personal connectors are rolling out on Team plans, with Enterprise to follow; those personal connectors are for user-requested work, not scheduled or agent-started runs, which require connectors attached to the channel.

  • Write the HLDD after the implementation works. Geoffrey Huntley’s pattern: use pre-commit hooks and agent skills to keep the high-level design doc updated, then self-host it in the product. Put the human-authored rationale and success measures first, implementation details below, and editor remarks where a subsection needs its intent preserved.

📡 WHAT SHIPPED

  • Antigravity 2.0 adds /plan in the app and CLI. The workflow explores files and dependencies without writing code, asks clarifying questions, then produces a reviewable plan with verification checkpoints. Review or adjust it and click Proceed; the docs say whether the agent pauses for approval is configurable through the artifact review policy, so set that explicitly if you need a hard gate.

  • Microsoft Copilot Code is an app builder, not the new default coding IDE. It turns natural-language requests into dashboards, automations, and internal apps in a sandbox that can be hosted in a tenant. Frontier rollout is slated for month-end, Managed Runtime is already in preview, and Microsoft says developers will keep using GitHub Copilot for day-to-day work.

  • Autopilot is a separate persistent agent. Microsoft describes a cloud-hosted agent that watches channels, follows up, handles recurring work, and can resume projects days later; its blog says private-preview expansion is at month-end. Omar Shahine says it is built on OpenClaw, whose team worked with Microsoft on deployment readiness; local inference, file transfer, and code mode on machines connected to the OpenClaw gateway are still described as upcoming.

  • Cua Driver is now stable and open source for Omarchy. TryCua says its native synthetic cursor for Hyprland enables OS-level multi-cursor control. The repo shows two sessions operating Calc and Inkscape on Omarchy and supports agent connections through CLI, MCP, or typed SDKs.

  • OpenRouter introduced typesafe/jev-router, a cache-aware model-and-reasoning-effort selector. Theo’s objection is coding-specific: Jev categorizes but cannot see the codebase or the agent’s tools, so prompt-only complexity estimates may miss the work involved. He also doubts mid-task downgrades save much when cache writes are a large cost, and says he is still gathering numbers; his early comparison to a “DeepSeek 4.1 Flash router” is only an impression.

🎬 GO DEEPER

  • PR — Omarchy ttfx Rust-to-assembly port: Inspect how Rust remains the front end and fallback for unported effects, while the assembly engine is checked against byte-for-byte oracle cases.

  • Repo — Cua Driver: The quickstart connects an agent to Calculator, asks it to compute 6 × 7, and checks that the app displays 42; the repo also documents CLI, MCP, and SDK integrations.

Editorial take: The edge is not simply “let it run”: specify the finish line, then give an independent reviewer and a real execution environment a chance to falsify the result.

Opus 5.5 Clears a Stalled Port; the Assembly Speedup Has a Narrow Benchmark
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