Describe the Bug Hello, when using Cursor, I selected the Opus 4.7 1M model. However, during my conversation, I noticed that the limit seems to be 300K tokens. Once it reaches 300K, my conversation is automatically compressed. What is the reason for this? Steps to Reproduce Hello, when using Cursor…

Hey, yeah, this is a known issue. With Max mode enabled on Opus 4.7, the real context cap is about 300K and auto-summarization kicks in, even though the UI shows 1M. It’s a bug on our side, the team is aware, but I can’t share an ETA yet. We’re tracking it here: Opus 4.7 Max mode shows only 200K co…

I selected the Opus 4.7 1M model, but the actual context limit is 300K

Support Bug Reports

Topic		Replies	Views
Max Mode shows 300K context limit instead of 1M for all models (Opus 4.6, Sonnet 4.5, etc.) Bug Reports nightly , max-mode , context , anthropic	1	413	May 12, 2026
1M doesnt change context window Bug Reports max-mode , context , openai , anthropic	3	195	May 4, 2026
Claude models stuck at 200k context window size Bug Reports max-mode , context , anthropic	2	340	April 1, 2026
Chat context limited to 70k for a 200K model Bug Reports chat , max-mode , context , anthropic	1	113	February 17, 2026
Custom context size (200K) not reflected in status bar — still shows 1M Bug Reports chat , max-mode , anthropic	1	133	March 30, 2026

I selected the Opus 4.7 1M model, but the actual context limit is 300K

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