Every current Claude model (Claude Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5) has a 1 million token context window on the Claude API, with up to 128K output tokens, according to Anthropic’s models overview.
As of November 9, 2026, the window in the Claude apps depends on the model. When you chat on a paid plan (Pro, Max, Ultra, Team or Enterprise), Fable 5.1, Opus 5.5, Opus 5, Sonnet 5.5, Sonnet 5 and Haiku 5.5 get 1M tokens, while Fable 5, Opus 4.6 to 4.8 and Sonnet 4.6 get 500K. Other models default to 200K tokens, which Anthropic describes as about 500 pages of text. In Claude Code, every listed Fable, Opus and Sonnet model can use 1M tokens, although Opus 4.6 and Sonnet 4.6 need their 1M model option and, on some plans, usage credits.
On paid plans with code execution turned on, Claude automatically summarizes earlier messages when a chat nears the limit, so most conversations can continue. Anthropic notes that this uses more of your usage limit.
Related: Claude usage limits: how much can you use on each plan?, Claude API pricing: how much does the Claude API cost? and Claude API Version 2026-10-21: Power-User Guide
Source: Claude Platform Docs, Models overview; Claude Help Center, How large is the context window on paid Claude plans?
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