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claude-code - 💡(How to fix) Fix [Bug] Resumed sessions ignore [1m] context spec, fall back to 200k (regression in 2.1.144) [1 participants]

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anthropics/claude-code#60548•Fetched 2026-05-20 03:55:44
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Resumed sessions ignore the [1m] context window suffix in the model setting and fall back to 200k context. Fresh sessions work correctly.

Root Cause

Resumed sessions ignore the [1m] context window suffix in the model setting and fall back to 200k context. Fresh sessions work correctly.

Code Example

⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛀ ⛁   Opus 4.6
⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁   claude-opus-4-6
⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁   67.7k/200k tokens (34%)
RAW_BUFFERClick to expand / collapse

Description

Resumed sessions ignore the [1m] context window suffix in the model setting and fall back to 200k context. Fresh sessions work correctly.

Repro

  1. Set "model": "claude-opus-4-6[1m]" in ~/.claude/settings.json
  2. Start a fresh session - /context shows 1M (correct)
  3. Exit and resume the session - /context shows 200k (wrong)
⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛀ ⛁   Opus 4.6
⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁   claude-opus-4-6
⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁ ⛁   67.7k/200k tokens (34%)

Regression

  • Broken: 2.1.144 (auto-updated 2026-05-19)
  • Working: 2.1.143 (downgrading fixes it)

Environment

  • macOS, standalone installer
  • claude-opus-4-6[1m] in global settings.json

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#dependency error#configuration error#environment variable#network issue#logging issue

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claude-code - 💡(How to fix) Fix [Bug] Resumed sessions ignore [1m] context spec, fall back to 200k (regression in 2.1.144) [1 participants]