Claude Code 2.1.280 Ships with Opus 5.5 as Default Model
Claude Code 2.1.280 rolls out 114 CLI changes, making Claude Opus 5.5 (1M context, $4/$20 per million tokens) the default model, with new identifiers also hinting at Haiku 4.5.
2026-09-23 ~ 2026-09-23 · 3 related posts
- Episode 1: Claude Opus 5.5 Spotted in Claude Code Ahead of Imminent Launch(2026-09-23, 8 posts)
- Episode 2: Anthropic Launches Claude Opus 5.5: Stronger, 40% Cheaper, Tops AA Index(2026-09-23, 259 posts)
- Episode 3: Anthropic Launches Banked Usage Resets Alongside Opus 5.5(2026-09-23, 10 posts)
- Episode 4: Perplexity Rolls Out Opus 5.5 to All Users, Citing 67.6% Cost Savings(2026-09-23, 2 posts)
- Episode 5: Anthropic Teases Sonnet 5.5 and Haiku 5.5 Within Weeks(2026-09-23, 2 posts)
- Episode 6: Claude Code 2.1.280 Ships with Opus 5.5 as Default Model(2026-09-23, 3 posts)
- Episode 7: Claude Opus 5.5 Rumored to Fall Back to Weaker Models on Frontier Dev Tasks(2026-09-23, 4 posts)
- Episode 8: Claude Opus 5.5 Sparks Wave of Community Demos Within 24 Hours(2026-09-23, 14 posts)
- Episode 9: Dev recreates Minecraft in browser with Opus 5.5(2026-09-23, 2 posts)
- Episode 10: Rumor: Claude Opus 5.5 Stuns OpenAI, GPT-6.1 Timeline Squeezed(2026-09-23, 3 posts)
- Episode 11: Opus 5's FrontierCode Score Drops from 53.4% to 48% in New Card(2026-09-23, 3 posts)
- Episode 12: Developers Say Opus 5.5 Is Faster, Cheaper and Back as Daily Coding Model(2026-09-23, 4 posts)
- Episode 13: Claude Opus 5.5 Shown Generating Pixel-Art Animated Scenes(2026-09-23, 2 posts)
- Episode 14: Claude Opus 5.5 Launch Wins Rarely Unified Praise as Users Return from Codex(2026-09-24, 28 posts)
- Episode 15: Claude Opus 5.5 Tops Code Arena, Beating GPT-6 Astra by 26 Points(2026-09-24, 2 posts)
- Episode 16: Claude Opus 5.5 Delivers Fast, Proactive Coding That Developers Say Enables Flow State(2026-09-24, 2 posts)
- Claude Code 2.1.280 ships 114 CLI changes, defaults to Opus 5.5 at $4/$20 per Mtok — ClaudeCodeLog · 2026-09-23
- Claude Code 2.1.280 ships 114 changes, makes Opus 5.5 with 1M context the default — ClaudeCodeLog · 2026-09-23
- Claude Code 2.1.280 metadata reveals Opus 5.5 and Haiku 4.5 model IDs, 65% prompt token jump — ClaudeCodeLog · 2026-09-23