[BUG] /compact fails with "response did not contain valid text content" when using OpenRouter/third-party models

Related Claude Code issues

Matched on shared title terms, labels, topic and reported release — ranked so issues with real discussion come first.

• I want to use openrouter
  Resolved 💬 13 #2
• [BUG] Misleading error message when context window is exceeded for third-party models (mimo-v2.5-pro)
  Resolved 💬 4 v2.1.139 #58252
• [BUG] VSCode "There's an issue with the selected model" With OpenRouter
  Resolved 💬 7 #44752
• [BUG] Desktop app does not save OpenRouter API key
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• Context window detection fails for third-party Anthropic-compatible providers
  Resolved 💬 11 #46416
• [Feature Request] Support multiple providers simultaneously (e.g., Claude Max + OpenRouter)
  Resolved 💬 4 v2.1.81 #38135
• Auto-compaction fails and ends the session on third-party models after the new unknown-model window enforcement
  Open 💬 1 v2.1.205 #85499
• [BUG] OpenRouter model names (dot notation) not recognized by getCanonicalName, causing modelSupports1M=false and capability degradation
  Resolved 💬 7 v2.1.104 #47298

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Same class of failure, ranked by community engagement — this issue is one of many, so it may not appear in the visible list: Context window & memory limits

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