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Significant response time degradation over last releases #1761

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opened 2026-02-16 17:32:31 -05:00 by yindo · 4 comments
yindo commented 2026-02-16 17:32:31 -05:00
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Originally created by @fkukuck on GitHub (Sep 19, 2025).

Originally assigned to: @rekram1-node on GitHub.

I'm experiencing a significant performance degradation of how fast opencode works in the last versions.
These recordings should give you an impression.

https://github.com/user-attachments/assets/51239ba0-153c-403e-b180-3e617a080735

https://github.com/user-attachments/assets/eae87730-b0a3-4be6-9be0-142860f069dc

They are unaltered, and reproducible every single time under these conditions (haven't tried others):

  • gpt-5-mini
  • GitHub Copilot Authentication
  • v0.5.24 vs. v0.10.1
Originally created by @fkukuck on GitHub (Sep 19, 2025). Originally assigned to: @rekram1-node on GitHub. I'm experiencing a significant performance degradation of how fast opencode works in the last versions. These recordings should give you an impression. https://github.com/user-attachments/assets/51239ba0-153c-403e-b180-3e617a080735 https://github.com/user-attachments/assets/eae87730-b0a3-4be6-9be0-142860f069dc They are unaltered, and reproducible every single time under these conditions (haven't tried others): - gpt-5-mini - GitHub Copilot Authentication - v0.5.24 vs. v0.10.1
yindo closed this issue 2026-02-16 17:32:31 -05:00
yindo commented 2026-02-16 17:32:31 -05:00
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@rekram1-node commented on GitHub (Sep 19, 2025):

@fkukuck I think this is just the default settings giving to gpt-5 models changing, right now it defaults to high reasoning effort which means it takes longer

You can override this if you would like

@rekram1-node commented on GitHub (Sep 19, 2025): @fkukuck I think this is just the default settings giving to gpt-5 models changing, right now it defaults to high reasoning effort which means it takes longer You can override this if you would like
yindo commented 2026-02-16 17:32:31 -05:00
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@fkukuck commented on GitHub (Sep 19, 2025):

I wasn’t aware since I thought GitHub Copilot always runs medium and there is no choice possible.

@fkukuck commented on GitHub (Sep 19, 2025): I wasn’t aware since I thought GitHub Copilot always runs medium and there is no choice possible.
yindo commented 2026-02-16 17:32:31 -05:00
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@fkukuck commented on GitHub (Sep 19, 2025):

Will confirm next week

@fkukuck commented on GitHub (Sep 19, 2025): Will confirm next week
yindo commented 2026-02-16 17:32:31 -05:00
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@rekram1-node commented on GitHub (Sep 19, 2025):

@fkukuck to override this you can set this in your opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "github-copilot": {
      "models": {
        "gpt-5-mini": {
          "options": {
            "reasoningEffort": "minimal",
            "textVerbosity": "low"
          }
        }
      }
    }
  }
}

to see available options read vercel ai sdk docs: https://ai-sdk.dev/providers/ai-sdk-providers/openai#responses-models

reasoningEffort 'minimal' | 'low' | 'medium' | 'high' Reasoning effort for reasoning models. Defaults to medium.
textVerbosity 'low' | 'medium' | 'high' Controls the verbosity of the model's response. Lower values result in more concise responses, while higher values result in more verbose responses. Defaults to 'medium'.

@rekram1-node commented on GitHub (Sep 19, 2025): @fkukuck to override this you can set this in your opencode.json: ``` { "$schema": "https://opencode.ai/config.json", "provider": { "github-copilot": { "models": { "gpt-5-mini": { "options": { "reasoningEffort": "minimal", "textVerbosity": "low" } } } } } } ``` to see available options read vercel ai sdk docs: https://ai-sdk.dev/providers/ai-sdk-providers/openai#responses-models reasoningEffort 'minimal' | 'low' | 'medium' | 'high' Reasoning effort for reasoning models. Defaults to medium. textVerbosity 'low' | 'medium' | 'high' Controls the verbosity of the model's response. Lower values result in more concise responses, while higher values result in more verbose responses. Defaults to 'medium'.
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Reference: anomalyco/opencode#1761
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