[Windows/Desktop v1.17.11] OpenAI gpt-5.5-fast xhigh fails with reasoning part rs_*:0 not found #33934

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1. github-actions

   assigned

   nexxeln

   on Jun 25, 2026
2. github-actions commented on Jun 25, 2026

   

   github-actionsBot

   on Jun 25, 2026 – with GitHub Actions

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

   • Stream parsing: "text part <uuid> not found" when provider is OpenAI-compatible proxy (LiteLLM) #25487: Same <type> part <id> not found error pattern during stream parsing/part-id reconciliation — different provider (LiteLLM proxy) but the same processor-layer mechanism
   • processor.ts: merge multiple reasoning-start/end cycles into one part #27987: Directly related reasoning-start/end cycle merging in processor.ts (which you also referenced) — covers multiple reasoning segments mapped to the same reasoning item id
3. arcanistzed commented on Jul 16, 2026

   

   arcanistzed

   on Jul 16, 2026

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   I’m encountering the same issue:

   • Fedora Workstation 44, x86_64
   • OpenAI via OAuth
   • openai/gpt-5.6-sol (non-fast)
   • medium reasoning variant
   • plan agent, primary mode
   • llm.runtime=ai-sdk
   • No plugins

   The affected session was originally created with OpenCode 1.17.19. The logs from the run containing the failures also record newly created sessions as version 1.18.1.

   Prompting with continue from the affected conversation branch failed repeatedly. Two consecutive attempts in the same session produced the same error with different reasoning IDs:

   stream providerID=openai modelID=gpt-5.6-sol small=false agent=plan mode=primary
   llm.runtime=ai-sdk llm.provider=openai llm.model=gpt-5.6-sol
   process error="reasoning part rs_<redacted-1>:0 not found"
   

   stream providerID=openai modelID=gpt-5.6-sol small=false agent=plan mode=primary
   llm.runtime=ai-sdk llm.provider=openai llm.model=gpt-5.6-sol
   process error="reasoning part rs_<redacted-2>:0 not found"
   

   I recovered the same session by reverting to an earlier message and submitting the original prompt again unchanged. The next request in that session proceeded normally, including further tool/subagent calls. Changing the prompt was not required.

   This differs slightly from recovery by “changing what it’s thinking about”: in my case, the identical prompt succeeds after rolling back the conversation branch. That makes a prompt-only trigger less likely and suggests the failure may depend on reasoning-part state retained in the affected branch. The fact that the session crossed an OpenCode version upgrade may also be relevant.

   This confirms the issue on Linux, with non-fast GPT-5.6 Sol and the medium reasoning variant.
4. rekram1-node commented on Jul 17, 2026

   

   rekram1-node

   on Jul 17, 2026

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   Hm this shouldn't be possible unless u are overriding the default settings. Show me opencode debug config
5. rekram1-node

   assigned

   rekram1-node

   and unassigned

   nexxeln

   on Jul 17, 2026
6. NedMalki-Chief

   changed the title [-][Windows/Desktop v1.17.11] OpenAI gpt-5.5-fast xhigh fails with reasoning part rs_*:0 not found[/-] [+][OpenCode Windows/Desktop v1.17.11] custom OpenAI gpt-5.5-fast/xhigh stream fails: reasoning part rs_*:0 not found[/+] on Jul 18, 2026
7. arcanistzed commented on Jul 18, 2026

   

   arcanistzed

   on Jul 18, 2026

   Last edited by arcanistzed

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   This is my current opencode debug config. The MCP entries were added after the error and were not active during the affected session. At the time, my source config contained only the $schema field, with no provider, model, agent, plugin, or mcp overrides.

   The timestamps confirm this:

   • ~/.local/share/opencode/log/opencode.log records the errors at 2026-07-16T07:50:11Z and 2026-07-16T07:53:29Z.
   • OpenCode’s apply_patch tool call records the MCP block being added at 2026-07-16T19:20:26Z. The diff shows that the previous config contained only $schema.
   • The config file’s modification time is 2026-07-16 15:20:26 -0400, equivalent to 19:20:26Z, corroborating the tool-call record.

   Thus, the MCP configuration was added approximately 11 hours and 27 minutes after the errors. The affected session was effectively using the default configuration.

   Current opencode debug config output:

   {
     "$schema": "https://opencode.ai/config.json",
     "mcp": {
       "cloudflare": {
         "type": "remote",
         "url": "https://mcp.cloudflare.com/mcp",
         "enabled": true,
         "oauth": {}
       },
       "cloudflare-docs": {
         "type": "remote",
         "url": "https://docs.mcp.cloudflare.com/mcp",
         "enabled": true
       },
       "cloudflare-bindings": {
         "type": "remote",
         "url": "https://bindings.mcp.cloudflare.com/mcp",
         "enabled": true,
         "oauth": {}
       },
       "cloudflare-builds": {
         "type": "remote",
         "url": "https://builds.mcp.cloudflare.com/mcp",
         "enabled": true,
         "oauth": {}
       },
       "cloudflare-observability": {
         "type": "remote",
         "url": "https://observability.mcp.cloudflare.com/mcp",
         "enabled": true,
         "oauth": {}
       }
     },
     "agent": {},
     "mode": {},
     "plugin": [],
     "command": {},
     "username": "arcanist"
   }
8. NedMalki-Chief

   changed the title [-][OpenCode Windows/Desktop v1.17.11] custom OpenAI gpt-5.5-fast/xhigh stream fails: reasoning part rs_*:0 not found[/-] [+][Windows/Desktop v1.17.11] OpenAI gpt-5.5-fast xhigh fails with reasoning part rs_*:0 not found[/+] on Jul 18, 2026
9. github-actions commented on Sep 18, 2026

   

   github-actionsBot

   on Sep 18, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
10. github-actions

    closed this as not plannedon Sep 18, 2026