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The weekly strip · 102 issues · page 9 of 9

What shipped, and what to build with it

One post a week on the AI models and tools that matter to people shipping products: dates, prices, limits, and what I would actually use. Primary sources only.

  1. Issue 06

    10 October 2026 · Model watch · 6 min read

    Claude Sonnet 4.5 retires on 30 November 2026: a migration checklist

    claude-sonnet-4-5-20250929 retires on 30 November 2026. The settings that now return a 400 on Sonnet 5.5, the cost delta, and how to test before the date.

    • Claude Sonnet 4.5
    • Claude Sonnet 5.5
    • deprecation
    • migration
    • LLM pricing
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  2. Issue 05

    10 October 2026 · Model watch · 6 min read

    Claude Opus 5.5 breaking changes: thinking can't be disabled

    Opus 5.5 costs less per token than Opus 5 but returns a 400 for thinking disabled and forced tool_choice. The exact errors, the cost trap and a migration checklist.

    • Claude Opus 5.5
    • migration
    • API
    • adaptive thinking
    • LLM pricing
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  3. Issue 04

    10 October 2026 · Model watch · 7 min read

    Claude Haiku 5.5 for classification: what changed and what it costs

    Haiku 5.5 launched 7 October 2026 at $0.10 input and $0.50 output per million tokens. What changed from 4.5, what returns a 400, and a classification bill priced out.

    • Claude Haiku 5.5
    • classification
    • LLM pricing
    • structured outputs
    • prompt caching
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  4. Issue 03

    10 October 2026 · Building with AI · 8 min read

    Jev as a programming primitive: typed questions, not prompts

    Jev answers typed questions with calibrated probabilities instead of writing text: how Choice, Score and Noul work, what confidence means, and a worked intake example.

    • TypeSafe Jev
    • System One
    • structured output
    • classification
    • confidence
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  5. Issue 02

    10 October 2026 · Building with AI · 8 min read

    Prompt caching economics: what a RAG bill looks like in 2026

    Cached input now costs 5 to 10% of list price on Claude, Gemini and GPT-6. The rules, minimums and traps, plus a 10,000-call-a-day RAG bill priced on three models.

    • prompt caching
    • LLM pricing
    • RAG
    • Claude Sonnet 5.5
    • Gemini 3.8 Flash
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  6. Issue 01

    10 October 2026 · Model watch · 8 min read

    Which AI model should you build on in October 2026?

    Claude 5.5, GPT-6, Gemini 3.8 and TypeSafe's Jev all shipped in five weeks. Dates, prices and limits from primary sources, and what I would actually pick for a product.

    • Claude 5.5
    • GPT-6
    • Gemini 3.8
    • TypeSafe Jev
    • model selection
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