OpenCode.json reasoningEffort setting doesnt work? #25026

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1. mejobloggs-cw

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   bugSomething isn't workingSomething isn't working

   on Apr 30, 2026
2. github-actions commented on Apr 30, 2026

   

   github-actionsBot

   on Apr 30, 2026 – with GitHub Actions

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

   • OpenAI reasoningEffort=xhigh is not visible in TUI or export #18634: reasoningEffort set for the build agent is not visibly confirmed to be active in TUI or export — may reflect the same underlying problem where the setting is parsed but not applied
   • subagent model variants are parsed but not applied at runtime in v1.4.0 #21632: Agent-level model config (including reasoningEffort) is parsed correctly but not applied at runtime in the subagent execution path

   If your issue is specifically that the setting is being silently ignored (rather than just not displayed), #21632 in particular may describe the same root cause.

   If you believe this is a distinct issue, feel free to clarify how your case differs from those reports.
3. github-actions

   assigned

   rekram1-node

   on Apr 30, 2026
4. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on Apr 30, 2026
5. mejobloggs-cw commented on Apr 30, 2026

   

   mejobloggs-cw

   on Apr 30, 2026

   Last edited by mejobloggs-cw

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   If I'm doing the opencode.json wrong, is there a way to save current TUI settings?

   I tried setting to Medium via the TUI which works, but I couldnt see any way to save/export the settings.

   I'm not sure if those issues above are duplicates of my issue. I don't know enough of the opencode technicals to understand. I'm just a new user trying to setup a "starter config" with my team
6. rekram1-node commented on Apr 30, 2026

   

   rekram1-node

   on Apr 30, 2026

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   Try using variants instead (see docs)
7. mejobloggs-cw commented on Apr 30, 2026

   

   mejobloggs-cw

   on Apr 30, 2026

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   How do you reference a variant? The docs dont seem to cover that

   For example, this shows how to create "thinking" variant:
   https://opencode.ai/docs/models/#custom-variants

   Then i tried something like

   "build": { "model": "github-copilot/gpt-5/thinking" }
   

   But opencode says that's invalid.

   I read through the whole models section and didn't spot a way.
8. rekram1-node commented on Apr 30, 2026

   

   rekram1-node

   on Apr 30, 2026

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   How are u trying to reference it? like whats your goal?
9. mejobloggs-cw commented on Apr 30, 2026

   

   mejobloggs-cw

   on Apr 30, 2026

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   The end goal is to have Opencode use GPT 5.4 Medium by reading the setting from Opencode.json (not manually switching it to medium via the UI)

   Following this example https://opencode.ai/docs/models/#custom-variants I attempted to create a "Thinking" variant (just following the example. If it worked I would then create a "Medium" variant)

   That example creates the variant, but how do I set Build mode to use that variant? The docs don't appear to say how

   I tried both of these (just attempting to mimic the json hierarchy hoping it would work), but they resulted in errors:

   "build": { "model": "github-copilot/gpt-5/thinking" }
   

   and

   "build": { "model": "github-copilot/gpt-5", "variant": "thinking" }
   

   My current Full opencode.json, using variants as suggested, which still shows in the UI as Build using GPT 5.4 High

   {
       "$schema": "https://opencode.ai/config.json",
       "provider": {
           "copilot": {
               "models": {
                   "gpt-5.4": {
                       "variants": {
                           "plan-high": {
                               "reasoningEffort": "high",
                               "textVerbosity": "low"
                           },
                           "build-medium": {
                               "reasoningEffort": "medium",
                               "textVerbosity": "low"
                           }
                       }
                   }
               }
           }
       },
       "model": "github-copilot/gpt-5.4",
       "agent": {
           "plan": {
               "model": "github-copilot/gpt-5.4",
               "variant": "plan-high"
           },
           "build": {
               "model": "github-copilot/gpt-5.4",
               "variant": "build-medium"
           }
       }
   }
   
10. thdxr

    removed

    bugSomething isn't workingSomething isn't working

    coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

    on May 3, 2026
11. thdxr

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    kitlangton

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    rekram1-node

    on May 3, 2026
12. github-actions commented on Jul 3, 2026

    

    github-actionsBot

    on Jul 3, 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.
13. github-actions

    closed this as not plannedon Jul 3, 2026