OpenCode fix for Anthropic plans

opencode-anthropic-system-prompt.patch

diff --git a/packages/opencode/src/session/system.ts b/packages/opencode/src/session/system.ts
--- a/packages/opencode/src/session/system.ts
+++ b/packages/opencode/src/session/system.ts
@@ -27,12 +27,12 @@
   }

   export function provider(model: Provider.Model) {
+    if (model.providerID.includes("anthropic") && model.api.id.includes("claude")) return []
     if (model.api.id.includes("gpt-5")) return [PROMPT_CODEX]
     if (model.api.id.includes("gpt-") || model.api.id.includes("o1") || model.api.id.includes("o3"))
       return [PROMPT_BEAST]
     if (model.api.id.includes("gemini-")) return [PROMPT_GEMINI]
-    if (model.api.id.includes("claude")) return [PROMPT_ANTHROPIC]
     return [PROMPT_ANTHROPIC_WITHOUT_TODO]
   }

opencode-fix.nix

{ inputs, ... }:
{
  environment.systemPackages = [
    (inputs.opencode.packages.${pkgs.stdenv.hostPlatform.system}.default.overrideAttrs (old: {
      patches =
        (old.patches or [])
        ++ [
          ./opencode-anthropic-system-prompt.patch
        ];
    }))
  ];
}

... good temporary fix until the OpenCode releases the official fix.

if

I updated this gist for todays block
Patch is based on this PR: anomalyco/opencode#8553

Seems to work so far