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invalid function arguments json string: Codex

Quick fix

Upgrade cc-switch to 3.16.4 or later, then retest with MiniMax-M3.

Symptom

Section titled “Symptom”
Error output
CC Switch local proxy failed while handling Codex endpoint /responses. Provider: MiniMax; model: MiniMax-M3; upstream_status: HTTP 400; cause: invalid params, invalid function arguments json string, tool_call_id: call_function_ou9fwsqecq27_1 (2013)

Cause

Section titled “Cause”

This report occurred when Codex called MiniMax-M3 through the cc-switch local proxy: the JSON string for tool-call arguments was invalid, causing the upstream to return HTTP 400 (2013) and preventing the session from continuing.

The maintainer stated that v3.16.4 restored the historical function_call field for Codex tool calls, prevented empty streaming deltas from overwriting tool-call state, and changed MiniMax domestic and international versions to use the native OpenAI Responses API instead of Responses→Chat conversion. These changes may cover the issue, but the original post did not confirm the retest result, so this is not a verified fix.

Fix

Section titled “Fix”

  1. Upgrade cc-switch from 3.16.3 to 3.16.4 or later.

  2. Retest tool calls with MiniMax-M3 in Codex. If the issue persists, reopen the original issue as the maintainer advised and include the latest version and logs.

Affected Versions

Section titled “Affected Versions”
ToolCodex
Version3.16.3（报告版本；维护者建议升级至 3.16.4 及以上复测）
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”
What if the issue still occurs after upgrading?
The maintainer recommends reopening the issue and including the latest version and logs for further investigation.
Has this fix been confirmed?
Not yet. The maintainer only said the v3.16.4 changes may cover the issue and requested a retest after upgrading.
Section titled “Related problems”
unknown model 'ark-code-latest' (2013)Change the MiniMax provider's model ID to `MiniMax-M3` or a model MiniMax actually supports, then save. Do not use Volcano Engine Ark's `ark-code-latest`.1 issues mergedexceeded retry limit, last status: 429 Too Many RequestsAn incorrect GLM preset URL can cause 429: delete the old GLM provider, create the official preset in cc-switch, confirm it uses a Coding Plan link, and check…3 issues mergedInput should be a valid string: Codex image requestUpgrade CC Switch to v3.20.4; it converts image `detail: "original"` to a value accepted upstream.1 issues merged

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