[BUG] "Upstream idle timeout exceeded"

I don't know what's causing it, but it seems to be coming from the session itself timing out when using the "writing-plans" skill.

OS: macOS Tahoe 26.5 (recently updated)
CPU: Apple M4
More info: "The upstream connection between the client and the model service idled out. This is an infrastructure timeout, not a model error. The model had finished gathering context and was about to produce output, but the connection dropped before the response could be transmitted."

Is this a server error for the model on OpenCode GO?

Thanks for updating the issue! The OS info, error context, and details about the writing-plans skill are helpful. Your report now meets our contributing guidelines.

I also have the same issue with MiMo v2.5 Pro on openrouter. It has been happening for weeks now. Getting it to write large plans always triggers the timeout.

Fedora Linux 44, KDE edition

i also have same issue with Nemotron 3 Ultra Free High
v1.16.2

confirm the issue with Nemotron 3 Ultra Free High

i also have same issue with mimo pro

I am having the same issue with Qwen Coder Next

All Nemotron models i tried always ended up with "Upstream idle timeout exceeded" when the model trying to use "Writing command"

Same issue with DS4 Flash/Pro

same issue with Nemotron 3 Ultra Free High here

same issue but only with Nemotron 3 Ultra Free High. Mimo v2.5 free still okay. current workaround is asking them to write in smaller batches. v1.16.2. using ubuntu linux. terminal alacraty

I have this Issue with MiniMax M3 Opencode {"code":504,"message":"Upstream idle timeout exceeded","metadata":{"error_type":"timeout"}}

OpenCode 1.17.4 - Macbook Pro Mx

having the issue with MiMo V2.5

same issue but only with Nemotron 3 Ultra Free High. Mimo v2.5 free still okay. current workaround is asking them to write in smaller batches. v1.16.2. using ubuntu linux. terminal alacraty

This trick worked for me "small batch writing" for Nemotron 3 Ultra.

$ErrorActionPreference = "Stop"
$chunkTimeoutMs = 2147483647
$stamp = Get-Date -Format "yyyyMMdd-HHmmss"

Close OpenCode processes if any are still alive.

Get-Process -ErrorAction SilentlyContinue | Where-Object {
$.ProcessName -like "opencode" -or
($(try { $.Path } catch { "" }) -like "opencode")
} | Stop-Process -Force -ErrorAction SilentlyContinue

Start-Sleep -Seconds 2

Reset the bloated Desktop GUI store, but keep a backup.

$desktopDir = Join-Path $env:APPDATA "ai.opencode.desktop"
$store = Join-Path $desktopDir "opencode.global.dat"

if (Test-Path $store) {
Rename-Item -LiteralPath $store -NewName "opencode.global.dat.$stamp.bak"
Write-Host "Backed up GUI store: opencode.global.dat.$stamp.bak"
}

Get-ChildItem -Path $desktopDir -Filter "opencode.global.dat.tmp-*" -ErrorAction SilentlyContinue |
Remove-Item -Force -ErrorAction SilentlyContinue

Create/update OpenCode global config for OpenRouter timeout.

$cfgDir = Join-Path $env:APPDATA "opencode"
$cfg = Join-Path $cfgDir "opencode.json"

New-Item -ItemType Directory -Force -Path $cfgDir | Out-Null

if (Test-Path $cfg) {
Copy-Item -LiteralPath $cfg -Destination "$cfg.$stamp.bak" -Force
$data = Get-Content -LiteralPath $cfg -Raw | ConvertFrom-Json
} else {
$data = [pscustomobject]@{}
}

function Set-Prop($obj, [string]$name, $value) {
if ($obj.PSObject.Properties[$name]) {
$obj.PSObject.Properties[$name].Value = $value
} else {
$obj | Add-Member -NotePropertyName $name -NotePropertyValue $value
}
}

function Ensure-Obj($obj, [string]$name) {
if (-not $obj.PSObject.Properties[$name] -or $null -eq $obj.PSObject.Properties[$name].Value) {
Set-Prop $obj $name ([pscustomobject]@{})
}
return $obj.PSObject.Properties[$name].Value
}

Set-Prop $data '$schema' 'https://opencode.ai/config.json'
$provider = Ensure-Obj $data 'provider'
$openrouter = Ensure-Obj $provider 'openrouter'
$options = Ensure-Obj $openrouter 'options'

Set-Prop $options 'timeout' $false
Set-Prop $options 'chunkTimeout' $chunkTimeoutMs

$data | ConvertTo-Json -Depth 32 | Set-Content -LiteralPath $cfg -Encoding UTF8

Write-Host "Done. OpenRouter chunkTimeout set to $chunkTimeoutMs ms."
Write-Host "Restart OpenCode."

This PS1 script slash chunk should help with the caching issues that makes the GUI feel really laggy especially for me and also the time out

same issue but only with Nemotron 3 Ultra Free High. Mimo v2.5 free still okay. current workaround is asking them to write in smaller batches. v1.16.2. using ubuntu linux. terminal alacraty

This trick worked for me "small batch writing" for Nemotron 3 Ultra.

Is not an actual fix but the prompt "Do the edits in small batches" does work as you mentioned, thanks!

I have the same issue, basically OpenRouter is unusable, never seen such unreliable provider, tried 10 differents models they all hit this very same error, I think for a "Router" they should at least make it usable for anything else than sending "hello world" to models.

confirm the issue with Nemotron 3 Ultra Free High

Same but even on default I get the same error. Also the continue in small baches doesn't really help much it seems.

Same issue here with GLM 5.2 on Openrouter. Very frustrating

To give more context to this issue, it does not seem to happen on the paid version (GO or Zen plans), only on the free tier models

Confirmed on Openrouter using GLM-5.2 (paid) via API plan. It's frequent and should be considered a blocker.
OS: EndeavourOS Linux x86_64
:+sssssssssso/. Host: HP Z640 Workstation -/ossssssssssssso/. Kernel: 7.0.14-zen1-1-zen
-/+sssssssssssssssso+: Uptime: 3 days, 22 hours, 7 mins
-:/+sssssssssssssssssso+/. Packages: 2524 (pacman) .://osssssssssssssssssssso++- Shell: bash 5.3.15
.://+ssssssssssssssssssssssso++: Resolution: 1920x1080
.:///ossssssssssssssssssssssssso++: DE: Plasma 6.7.1
:////ssssssssssssssssssssssssssso+++. WM: kwin -////+ssssssssssssssssssssssssssso++++- Theme: Breeze-Dark [GTK2], Breeze [GTK3]
..-+oosssssssssssssssssssssssso+++++/ Icons: breeze-dark [GTK2/3]
./++++++++++++++++++++++++++++++/:. Terminal: konsole
`:::::::::::::::::::::::::------`` CPU: Intel Xeon E5-2699 v4 (44) @ 2.879GHz
GPU: NVIDIA GeForce RTX 5060 Ti
Memory: 36146MiB / 80326MiB

I found when using the xhigh reasoning variant (GLM 5.2), this bug seems to happen much less often. Maybe this helps some of you!

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[BUG] "Upstream idle timeout exceeded" #28957

Close OpenCode processes if any are still alive.

Reset the bloated Desktop GUI store, but keep a backup.

Create/update OpenCode global config for OpenRouter timeout.

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[BUG] "Upstream idle timeout exceeded" #28957

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github-actions commented on May 23, 2026

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namcho commented on Jun 14, 2026

Germanized commented on Jun 15, 2026

Close OpenCode processes if any are still alive.

Reset the bloated Desktop GUI store, but keep a backup.

Create/update OpenCode global config for OpenRouter timeout.

RenanOSX commented on Jun 16, 2026

InfHorus commented on Jun 21, 2026

wasteofoxygen69 commented on Jun 24, 2026

thimvanamersfoort commented on Jul 5, 2026

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github-actions commented on Sep 15, 2026

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