◉CLAUDE LABJP
●2.1.310 — Monitor tool now works on Bedrock, Vertex and Foundry, and gateway failures are fixed (10/23)●2.1.307 — Fixes MCP failing to reconnect after sleep or a keychain lock (10/21). 2.1.306 also fixed the false claude -p login message●SONNET 4.5 — Retires on the Claude API on 11/30, 36 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●API — In API version 2026-10-21, passing temperature, top_p or top_k returns a 400 error●NEW — I Put a Ten-Line Promise File at the To…●2.1.310 — Monitor tool now works on Bedrock, Vertex and Foundry, and gateway failures are fixed (10/23)●2.1.307 — Fixes MCP failing to reconnect after sleep or a keychain lock (10/21). 2.1.306 also fixed the false claude -p login message●SONNET 4.5 — Retires on the Claude API on 11/30, 36 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●API — In API version 2026-10-21, passing temperature, top_p or top_k returns a 400 error●NEW — I Put a Ten-Line Promise File at the To…
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Message Batches

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Claude API2Cost Optimization1batch processing1error handling1
⬡ API & SDK/2026-04-11Intermediate

Running Claude's Message Batches Overnight — What the 50% Discount Actually Covers

What I learned running Claude API Message Batches for real: what the 50% discount covers, the custom_id character restriction, and designing around the 24-hour window and 29-day retention.

⬡ API & SDK/2026-07-02Advanced

When 41 of 20,000 Message Batches Requests Quietly Vanished — Field Notes on Reconciling and Requeuing Partial Failures

processing_status: ended does not mean every request succeeded. How errored and expired results hide inside a finished batch, and how a custom_id ledger catches every gap and requeues safely — with real cost and timing numbers.