# Claude Opus 4.8 context window lineage: /models/claude.md entity: /record/claude-opus-4-8.md predicate: context_window page: /record/claude-opus-4-8/context_window as_of: 2026-11-11 cite: AsOf. "Claude Opus 4.8 context window: 1M token context window", as of 2026-05-28. Claim clm_34EE9AAE8E66, https://asof.is/claim/clm_34EE9AAE8E66, accessed 2026-11-11. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28. As of November 11, 2026, Claude Opus 4.8's context window on the AsOf record is 1 M token context window, dated May 28, 2026, from a primary source (platform.claude.com). 1 claim on Claude Opus 4.8's context window, 1 open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted. ## Current context window What the record asserts on 2026-11-11. - [Claude Opus 4.8](/record/claude-opus-4-8.md) | context_window | 1M token context window | valid 2026-05-28 to present | conf 0.70 | valid | [clm_34EE9AAE8E66](/claim/clm_34EE9AAE8E66.md) sources: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28 ## Every dated value One claim per line, oldest first. Superseded claims stay visible. - [Claude Opus 4.8](/record/claude-opus-4-8.md) | context_window | 1M token context window | valid 2026-05-28 to present | conf 0.70 | valid | [clm_34EE9AAE8E66](/claim/clm_34EE9AAE8E66.md) sources: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28 ## Questions this record answers ### What is Claude Opus 4.8's current context window? 1 M token context window, dated May 28, 2026, from a primary source (platform.claude.com). The record asserts this claim as of November 11, 2026 (status valid, confidence 0.70). ## Read on - This page: /record/claude-opus-4-8/context_window (markdown: /record/claude-opus-4-8/context_window.md) - Entity twin: /record/claude-opus-4-8.md ยท timeline: /timelines/claude-opus-4-8.md --- AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.