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●2.1.283 — No Claude Code release over the weekend; 2.1.283 from September 25 is still the latest. Its new auto-mode default deserves a check against your allow rules●PLANS — Pro and Team Standard now default to Opus instead of Sonnet, a change shipped in Claude Code 2.1.280 that shifts how you compare plans●10/07 — Nine days left until the old spellings of the Claude Desktop / Cowork managed config keys stop being accepted; after that they fail closed●AUTO — Users are asking why commands covered by allow rules get rejected in auto mode. The fix is shaping the invoked command to match the rule●NEW — The week Opus 5.5 became the default: three places an alias was still pointing at the old model●CURSOR — Cursor credits burn in proportion to model cost, so routing Claude through Cursor gets expensive fast. Above ~50 requests a day, flat-rate Claude Code Pro is the steadier choice●2.1.283 — No Claude Code release over the weekend; 2.1.283 from September 25 is still the latest. Its new auto-mode default deserves a check against your allow rules●PLANS — Pro and Team Standard now default to Opus instead of Sonnet, a change shipped in Claude Code 2.1.280 that shifts how you compare plans●10/07 — Nine days left until the old spellings of the Claude Desktop / Cowork managed config keys stop being accepted; after that they fail closed●AUTO — Users are asking why commands covered by allow rules get rejected in auto mode. The fix is shaping the invoked command to match the rule●NEW — The week Opus 5.5 became the default: three places an alias was still pointing at the old model●CURSOR — Cursor credits burn in proportion to model cost, so routing Claude through Cursor gets expensive fast. Above ~50 requests a day, flat-rate Claude Code Pro is the steadier choice
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Fable 5

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Claude API3model selection1automation1Sonnet 51Opus 4.81extended thinking1streaming1migration1headless1cost management1logging1
⬡ API & SDK/2026-07-05Advanced

Fable 5 Is Back Worldwide and Sonnet 5 Is the Default — Where Each of the Three Models Belongs in a Solo Automation Stack

With Fable 5 redeployed worldwide and Sonnet 5 now the default, solo automation suddenly has three capable top-tier models to reach for. Instead of ranking them, this piece assigns each a role and captures that in a policy object with a fallback ladder and run-level logging.

⬡ API & SDK/2026-06-23Advanced

When Thinking Is Always On, Prefill Quietly Stops Working — Fixing Streaming and Token Budgets for Fable 5

Fable 5 thinks by default. Prefill no longer applies, the first streamed block isn't text, and max_tokens has to leave room for reasoning. Here is how I fixed those three broken assumptions in my own automated publishing pipeline.

⬡ API & SDK/2026-06-14Advanced

Record Which Model Actually Answered — Attestation Logging for Headless Pipelines

Persist the model field and usage from every API response so you can detect when the served model differs from the one you requested, and reconcile per-model cost ahead of the usage credits change.