One-million-token windows as the default

watching Models and releases first seen 2026-09-22

first seen

Its history

• 2026-09-22 new → watching

  first seen

Filed under this

• 2026-09-27 Claude Code 2.1.280 sets Opus 5.5 as the default Opus model, with a 1M-token window · Agents and tooling · 1 source
• 2026-09-22 Anthropic released Claude Opus 5.5 with a 1M-token context window · Models and releases · 2 sources