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unexpected status 404 Not Found: Unknown error - Codex

Quick fix

DeepSeek does not support the Responses API. Add /v1 to base_url and remove wire_api = "responses".

Symptom

Section titled “Symptom”
Error output
unexpected status 404 Not Found: Unknown error, url: https://api.deepseek.com/responses

Cause

Section titled “Cause”

When using DeepSeek models in Codex, setting `wire_api` to `responses` causes requests to the `/responses` endpoint. Since DeepSeek does not support the Responses API, it returns a 404 Not Found error.

Fix

Section titled “Fix”

  1. Open the Codex config file (usually at `~/.codex/config.toml`).

  2. In `[model_providers.custom]`, update `base_url` to include `/v1` and remove `wire_api = "responses"`.

  3. If errors persist, delete the current DeepSeek preset in cc-switch and re-add it, ensuring standard OpenAI-compatible interface usage instead of Responses API.

Affected Versions

Section titled “Affected Versions”
ToolCodex
Version26.429.30905
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 2 real issues

FAQ

Section titled “FAQ”
Does DeepSeek support the Responses API?
No. DeepSeek only provides standard OpenAI-compatible interfaces; there is no responses endpoint.
Why does deleting config.toml and reconfiguring still result in a 404 error?
The regenerated config may still default to `wire_api = "responses"`. Manually modify `base_url` and remove that field, or delete the incorrect preset in cc-switch and reconfigure.
Section titled “Related problems”
api failed deserialize json body intoDepending on the error: roll Claude Code back, upgrade cc-switch, turn the local proxy off, or stop sending unsupported fields.7 issues mergedAPI Error: 400 Param Incorrect Claude CodeUpgrade CC Switch to v3.16.2+ to fix 400 errors caused by missing reasoning_content in MiMo thinking mode.2 issues mergedRequest body format invalid error - Claude CodeUpgrade cc-switch and enable the Rectifier, or add MAX_THINKING_TOKENS=0, for compatibility with third-party API formats.4 issues merged

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