OpenCode Subagents fail due to unsupported parameter on gpt-5.6-sol-fast
brandon-julio-t · ghdev · 2026-08-19
A user reported that Subagents using gpt-5.6-sol-fast (variant max) in OpenCode stop working after executing tools. Logs reveal the failure is caused by OpenCode sending the unsupported promptcacheretention option to the model. Multiple subagent sessions failed to complete tasks due to this error within a short period, with logs clearly indicating an invalid parameter error.
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