"The input is too long for the selected model." error when opencode sends a message with too many tokens (auto-compaction is not triggered) #57412

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1. opencode-agent commented on Oct 20, 2026

   

   opencode-agentBot

   on Oct 20, 2026 – with OpenCode Agent

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   Thanks for the report and the suggestion!

   To restate it: you'd like to be able to add your own provider error messages to the list that triggers auto-compaction, so custom endpoints with their own wording still get compacted instead of failing.

   What's happening: OpenCode decides an error means "context overflow" by matching its text against a fixed list of known phrases. That list has input is too long for requested model, but your endpoint says input is too long for the selected model, so it doesn't match and compaction never starts. Right now there's no setting or plugin hook to add your own phrases. Maintainers will consider both broadening the built-in phrase and making the list configurable.

   Related issues:

   • [Bug] litellm ContextWindowExceededError not detected as context overflow #44888: same root cause, with LiteLLM's ContextWindowExceededError wording not recognised
   • [v2] One-shot provider-overflow recovery does not engage when the provider returns an opaque 400 (e.g. bare "invalid request") — session dead-ends with no recovery #46564: a custom endpoint's bare 400 not treated as an overflow
   • compaction: 1M-context sessions never auto-compact before the provider returns HTTP 400, and the 400 is not treated as context overflow #50574: 1M-context sessions where the provider's 400 isn't treated as an overflow

   👍React with 👍1Reacted by GenosseFlosse
2. rekram1-node

   closed this as completedin #57982on Oct 22, 2026