CLAUDE LABJP
MODEL — Claude Fable 5.1 and Claude Mythos 5.1 landed on September 1. They are the same underlying model; only the strength of the safeguards differsPRICING — Per-token rates hold at $10/$50 per MTok. What changed is cache reads, cut 75% to $0.25 per MTokCOST — How much that saves depends on your workload: roughly 25% for typical use, up to about 45% for context-heavy agentic work. Worth measuring your own split before quoting a numberBENCH — Terminal-Bench-Science 0.1 climbs from 24.7% on Fable 5 to 52.6%. Anthropic also states a standard error of 3.5-4.5 points, which is worth remembering before reading small gaps as realSAFEGUARDS — Sharper cyber safeguards cut interventions in Claude Code sessions by roughly 60% on average. Finding vulnerabilities is now allowed; developing exploits still is notAPI — New API accounts created from today can no longer edit prior context while preserving Claude's thinking transcript. It is an anti-distillation measure, and existing accounts are unaffected for nowMODEL — Claude Fable 5.1 and Claude Mythos 5.1 landed on September 1. They are the same underlying model; only the strength of the safeguards differsPRICING — Per-token rates hold at $10/$50 per MTok. What changed is cache reads, cut 75% to $0.25 per MTokCOST — How much that saves depends on your workload: roughly 25% for typical use, up to about 45% for context-heavy agentic work. Worth measuring your own split before quoting a numberBENCH — Terminal-Bench-Science 0.1 climbs from 24.7% on Fable 5 to 52.6%. Anthropic also states a standard error of 3.5-4.5 points, which is worth remembering before reading small gaps as realSAFEGUARDS — Sharper cyber safeguards cut interventions in Claude Code sessions by roughly 60% on average. Finding vulnerabilities is now allowed; developing exploits still is notAPI — New API accounts created from today can no longer edit prior context while preserving Claude's thinking transcript. It is an anti-distillation measure, and existing accounts are unaffected for now
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Claude Code/2026-08-16Intermediate

A Runaway Build Dies Very Differently Under cgroup Than Under ulimit

Claude Code v2.1.233 added opt-in memory cgroup support for Bash tool commands on Linux. Capping virtual address space with ulimit -v and capping physical memory with a cgroup produce completely different failures — and only one of them lets your Node build start at all.

API & SDK/2026-07-31Advanced

The 400-Character Preview That Was Still Holding On to a Megabyte

Truncating tool output in your own MCP server does not free the original. Node's sliced strings keep the parent alive. Here is the measured 13-character boundary, which flattening tricks actually work, and a heap-snapshot audit script that counts the retained parents for you.

API & SDK/2026-07-24Advanced

When Memory Store Listings Returned Half the Rows: Migrating to agent-memory-2026-07-22

agent-memory-2026-07-22 changed memories.list: fixed ordering, stricter depth, segment-based path_prefix matching. How an audit quietly halved, an access layer that survives it, and measured depth=1 traversal cost.

Claude Code/2026-07-16Advanced

Your Overnight Session Wakes Up at 3GB — Four Places Memory Piles Up, and How to Tell Them Apart

The Claude Code process I left running overnight had grown to 3.4GB of resident memory by morning. Here are the four accumulation sources closed in 2.1.209, how to separate what's left in your own setup by sampling RSS slope, and a watchdog pattern that folds a session before it hurts.

Claude Code/2026-06-27Advanced

Will It Stay Light When You Run It Unattended? Observing and Capping Claude Code's Long-Session Memory

How to keep long, unattended Claude Code sessions from slowly getting heavier — with a tiny ps-based RSS sampler, a rolling-baseline watchdog, and session segmentation, shown with working scripts and a before/after comparison.

API & SDK/2026-06-14Advanced

Wiring Claude's Dreaming Into Memory Hygiene for Long-Running Agents

Managed Agents' Dreaming reviews past sessions and rewrites memory as a self-improvement loop. We unpack the published Harvey and Wisedocs numbers, build a complete self-hosted consolidation loop with the Anthropic SDK, and cover the production pitfalls.

API & SDK/2026-04-13Advanced

Building Production Conversational AI with Claude API — Context Management, Long-Term Memory, and Safety Filters

Solve context explosion, memory loss, and safety risks in production chat systems with a three-layer memory architecture and integrated guardrails using Claude API

Claude AI/2026-04-12Beginner

Why Claude Forgets What You Said — And 5 Fixes That Actually Work

Claude losing track of your instructions mid-conversation? Learn why context windows cause this and 5 practical strategies to keep Claude on track in long chats.

API & SDK/2026-04-06Advanced

Building a Persistent Memory Agent with Claude API, pgvector, and Redis: A Complete

A complete guide to building production-ready persistent memory for Claude API agents using PostgreSQL + pgvector + Redis. Learn vector search, layered memory architecture, session management, and GDPR-compliant data handling.

Claude Code/2026-03-25Beginner

Claude Code Memory Management Basics — Understanding CLAUDE.md and MEMORY.md

Learn how Claude Code's memory system works through CLAUDE.md and MEMORY.md. Persist project-specific instructions and feedback to streamline your AI-powered development workflow, with lessons from real day-to-day use.

Claude Code/2026-03-21Intermediate

Designing CLAUDE.md for Stable Output — Hierarchy, Sub-Agents, and External Memory

Learn how to structure CLAUDE.md with a 3-tier hierarchy, sub-agent workflows, and external memory to keep Claude Code's output consistent — with the practical lessons that actually moved the needle in real operation.

Claude AI/2026-03-18Beginner

Claude Memory Now Available to All Users — AI That Learns from Your Chat History

Complete guide to Claude's new Memory feature. Learn how Claude automatically remembers your preferences from chat history, now available to all users including the free plan. Setup, privacy controls, and practical tips.