[DecimalError] Invalid argument: [object Object]

[karthiknish]

Description

Keep getting this on opus 4.5

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response

[github-actions]

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

• claude-opus-4.5 on azure unusable #5294: claude-opus-4.5 on azure unusable - Similar DecimalError/invalid argument issues with opus 4.5 models
• [aws bedrock: anthropic opus 4.1] The arguments provided to the tool are invalid: Invalid input for tool write: JSON parsing failed: Text #1803: [aws bedrock: anthropic opus 4.1] JSON parsing failed - Related tool validation and JSON parsing errors with Anthropic opus models

Feel free to ignore if none of these address your specific case.

[rekram1-node]

what provider?

Can you share a session?

When does it happen?

Steps to reproduce?

[gcacoutinho]

I'm getting the same thing.
Just installed opencode on NixOS WSL via nix flakes configuration.
Didn't set up anything else, just tried to run anything and it shows this error.
On free models it shows the thinking process but doesn't execute anything.
I would share the session here but it doesnt show the error there, just the commands I've issued

[karthiknish]

yes had the similar issue as above

[gcacoutinho]

Quick update, tried the same thing on Debian WSL and it worked just fine.
Checked the version over on NixOS and it echoes 0.5.28 while Debian shows 1.0.198, apparently the NixOS version is quite old.
Not sure if that's the case for everyone.

edit: the weird thing is that I'm using unstable and my flakes are updated, maybe it has something to do with the WSL release? Not a big OS guy so I'm not sure that makes sense

edit2: not exactly sure what I did, I was trying a bunch of stuff but nix flake update (again) fixed the version and I'm now on 1.0.180 on NixOS and it seems to be working just fine

[jakejrichards]

+1 I'm seeing this as well. The error shows up as a final message / breaks chats randomly. It's very hard to debug, but I'm able to repro with (and I assume it's related to) the new @ai-sdk/anthropic major version (3.x.x) is installed, not seeing with 2.0.54.

[brandonwisnicki]

Architecturally, seems like it would make sense to pin the provider package to a specific version rather than always relying on latest. Otherwise, opencode will be at the mercy of whatever changes are made upstream (in this case a breaking change in ai-sdk).

A workaround right now is to change the provider.npm in the config to file://ABSOLUTE_PATH_TO_BUN_PROJECT/node_modules/@ai-sdk/anthropic where your bun project installs a pinned version rather than relying on the cache's latest version.

[Locbac]

On nix-darwin with nixpkgs at 25.11 and nix-darwin at the same I'm also getting a very old version

❯ opencode -v
0.3.58

Opencode on nixpkgs unstable is at 1.0.180, the interesting thing is that I set it specifically to grab the latest package, but it still is using an old one anyways.
I'm just adding a flake input with opencode itself:
Flake.nix

  inputs = {
    ...
    # OpenCode
    opencode-flake = {
      url = "github:sst/opencode";
      inputs.nixpkgs.follows = "nixpkgs";
    };

  };
  outputs = {
    self,
    ...
    opencode-flake,
    ...
  } ...

Apps.nix

{ 
  pkgs,
  config,
  nixpkgs-unstable,
  opencode-flake,
  ...
}:
{
  environment.systemPackages = with pkgs; [
    inputs.opencode-flake.packages.${pkgs.system}.default
    #(nixpkgs-unstable.legacyPackages.${pkgs.system}.opencode) #This didn't work before.
  ];

[rekram1-node]

Ah this seems like if you are on older version before we started pinning the provider packages (we had some built in but only recently did we include all of them, others were dynamically installed)

If u upgrade to more recent versions this should be fixed.