Cache Not Utilized When Using Third-Party new-api with Codex Model, Causing Quota Waste

[luoshuijs]

Description

When I use the new-api as a third-party relay and provide the Codex model, most sessions do not read the cache when using OpenCode output. This results in each request failing to utilize the cache from the previous session, leading to significant quota wastage.

Configuration as follows:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "test-openai": {
      "npm": "@ai-sdk/openai",
      "name": "openai",
      "options": {
        "baseURL": "https://test.net/v1",
        "setCacheKey": true
      },
      "models": {
        "codex/gpt-5.4" : {
          "name": "codex/gpt-5.4",
          "variants": {
            "xhigh": { "reasoningEffort": "xhigh" },
            "high": { "reasoningEffort": "high" },
            "medium": { "reasoningEffort": "medium" }
          }
        }
      }
    }
  }
}

When I use the official Codex connection, all sessions correctly utilize the cache.

Plugins

none

OpenCode version

v1.2.26

Steps to reproduce

No response

Screenshot and/or share link

According to the screenshot, only one cache read occurred among all these requests.

Operating System

windows 11

Terminal

Windows Terminal

[github-actions]

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

• Cache hit rate is low / zero #14065: Cache hit rate is low / zero — similar report of cache not being utilized, though with a different provider (DeepInfra)
• applyCaching called too freely, causes LiteLLM to fail #6473: applyCaching called too freely, causes LiteLLM to fail (closed) — related issue where third-party proxy setups using @ai-sdk/openai-compatible had caching misbehavior

If your issue is distinct from these (e.g., specifically tied to the Codex model + new-api relay combination), feel free to clarify and a maintainer will take a look.

[luoshuijs]

This issue has been fixed in version 1.3.0.

[Vinke2]

This issue has been fixed in version 1.3.0.
How did you solve it?