Models · 5 February 2026

Claude Opus 4.6 is the first Opus with a 1M-token context window, in beta

Claude Opus 4.6 became the first Opus-class model with a 1M-token context window (API beta) and 128k output tokens, at unchanged pricing of $5/$25 per million tokens. The launch also added agent teams in Claude Code, context compaction, adaptive thinking and effort controls. For developers, it made long-running agentic coding and whole-repository analysis practical on a top-tier model without a price increase.