Model stuck on context full

[Classic298]

Description

OpenCode does not gracefully handle when the model context is full. Instead, the current message remains in loading state forever and never finishes and it isn't obvious that the context limit is full because no error is being surfaced.

opencode version: Any. Literally this bug existed for months and still does
Windows
Steps to reproduce: Point custom provider at litellm with for example gpt models and just have a very long session. That session will eventually get suck on a forever loading state with no error or indication that the context is full and needs compaction

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• Bug reports should include Steps to Reproduce, OpenCode version, Operating System, and Terminal information — all of these fields are currently empty (_No response_). Please provide at least basic system information and steps (or a description of) how to trigger the context-full state.

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• prompt is too long unrecoverable #4845: "prompt is too long unrecoverable" — same symptom of hitting the context limit with no graceful error surfaced, session gets stuck
• Auto-compaction enabled by default, but context_length_exceeded errors still occur in agent workflows #8089: "Auto-compaction enabled by default, but context_length_exceeded errors still occur" — same underlying problem of context being exceeded without a clear error or recovery path

If you believe this was flagged incorrectly, please let a maintainer know.

[Classic298]

opencode version: Any. Literally this bug existed for months and still does
Windows
Steps to reproduce: Point custom provider at litellm with for example gpt models and just have a very long session. That session will eventually get suck on a forever loading state with no error or indication that the context is full and needs compaction

[github-actions]

Thanks for updating the issue! It now includes the necessary details — a clear description of the problem, your OS, version info, and steps to reproduce. Everything looks good.