claude-code·
Claude Opus vs Sonnet vs Haiku: Which Model to Use When (2026)
Full decision matrix for Claude Opus 5.5, Sonnet 5, and Haiku 4.5 with real cost math, task-by-task recommendations, and how to switch models.
Topic
anthropic
Articles about anthropic.
claude-code·
Claude Opus 5.5 Migration Guide: 4 Breaking Changes (2026)
Full Claude Opus 5.5 migration guide with fixes for the four breaking changes: thinking, tool_choice, thinking blocks, and computer_20251124.
claude-code·
Claude Code Auto Mode Default + Sept 1 Containment Escape Rule
On Aug 14 2026 Claude Code made auto mode the default. On Sept 1 a new Containment Escape rule blocked three risky moves. Plain non-tech guide.
claude-code·
Claude Code Weekly Limit Cut on Sept 14, 2026: What to Do
Anthropic's +50% Claude Code weekly promo ends Sept 13 and a smaller +25% base takes over Sept 14. Plain guide with per-plan numbers and workarounds.
claude·
Why Is Claude Fable 5 Currently Unavailable? What We Know
Claude Fable 5 and Mythos 5 were pulled on June 12 after a US Commerce Department order. Plain guide to what happened, why, and what to do next.