Claude Code v2.1.280 adds Opus 5.5 with 1M context at $4/$20 per Mtok
ashwin-ant · ghdev · 2026-09-23
anthropics/claude-code shipped v2.1.280:
- Adds Claude Opus 5.5 (claude-opus-5-5) as the default Opus model: 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads
- Mouse support extended to more fullscreen lists (/skills scrolling, /plugin skill state options)
- New CLAUDECODEMAXMCPDESCRIPTIONLENGTH to adjust the 2,048-char MCP tool description cap
- Security fixes: writes through symlinked paths are judged by where they land (acceptEdits, allow rules and auto mode no longer approve out-of-tree writes); auto mode stops endlessly retrying actions declined by safety checks and backs off when checks return no answer; validation fixes for Write calls with wrong field names
- UX fixes: double Ctrl+C/D no longer quits, stray n/y no longer close or confirm dialogs, first-click-to-focus no longer triggers the item underneath
More from coding & agent
- Stripe launches claimable sandboxes: frictionless payment integrations for AI agents — jeff_weinstein · 2026-11-12
- Databricks launches autonomous AI coworker Genie: 91% on enterprise tasks with half the tokens — Yuchenj_UW · 2026-11-12
- Loom founder launches Roma 2.0, a shared to-do list that orchestrates AI agents — thetripathi58 · 2026-11-12
- Developer proposes a 'blast radius' test for AI agents before building — Few-Garlic2725 · 2026-11-12
- Sosumi Eval: Apple Docs Access Lifts Coding Agent Pass Rates from ~33% to 94-98% — JordanMorgan10 · 2026-11-12
- CypherGuard fixes structurally wrong LLM Cypher queries, hitting 88.5% on CypherBench — JeremyCMorgan · 2026-11-12