Claude Code 2.1.280 metadata reveals Opus 5.5 and Haiku 4.5 model IDs, 65% prompt token jump
ClaudeCodeLog · x · 2026-09-23
ClaudeCodeLog's deeper parse of Claude Code 2.1.280 shows:
- New model IDs: claude-opus-5-5 and claude-haiku-4-5; new commands like edit-chrome-settings, edit-sandbox-settings, edit-skill-overrides; new CLAUDECODEPLUGINDIRS env var
- Removed legacy model IDs including claude-code-user, claude-shallow- and o5-2q
- Released 2d 19h after 2.1.278; bundle grew +1,120.3 kB (+2.2%), prompt files +4 (+26.7%), prompt tokens +10,204 (+65.2%)
- Prompt token mix shifted: tools 73.2%→67.3%, system 26.8%→32.7%
Related event: Claude Code 2.1.280 Ships with Opus 5.5 as Default Model(3 posts)→
More from coding & agent
- Engineer's data: 11x more merged PRs per month at AI-native Tano vs pre-AI PostHog — bibryam · 2026-11-08
- No Chinese models allowed: what's left for local document OCR when contracts rule out PaddleOCR and Qwen? — aidenclarke_12 · 2026-11-08
- ADLC means two different things: Agentic Development Lifecycle vs Agent Development Lifecycle — Thirumalaivasan_GJ · 2026-11-08
- Anthropic's Official claude-quickstarts Repo Nears 20k Stars for Claude API Developers — anthropics · 2026-11-08
- Open-source rwxmap labels API operations r/w/x with a 23MB local model replacing a paid LLM — Tight_Heron1730 · 2026-11-08
- Working With AI: Getting Better Results by Being 'Dumber', Not Smarter — glcst · 2026-11-08