Error: 400 unknown provider for model claude-opus-4-5-20251101

[adriangmuender]

Hi!

Being connected to Claude Code (Max subscription) and then looking to select any of the Opus 4.5 models I get this error when doing a prompt (e.g. "test"):
Error: 400 unknown provider for model claude-opus-4-5-20251101

The Sonnet models work as expected however. When having either of the Sonnet models selected and then prompting I get a model response back.

The config.json I use is (copied from https://github.com/automazeio/vibeproxy/blob/main/FACTORY_SETUP.md on Dec. 27, 2025):

{
  "custom_models": [
    {
      "model_display_name": "CC: Opus 4.5 (High)",
      "model": "claude-opus-4-5-20251101-thinking-32000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Opus 4.5 (Medium)",
      "model": "claude-opus-4-5-20251101-thinking-10000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Opus 4.5 (Low)",
      "model": "claude-opus-4-5-20251101-thinking-4000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Opus 4.5",
      "model": "claude-opus-4-5-20251101",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },    
    {
      "model_display_name": "CC: Sonnet 4.5",
      "model": "claude-sonnet-4-5-20250929",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Sonnet 4.5 (Low)",
      "model": "claude-sonnet-4-5-20250929-thinking-4000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Sonnet 4.5 (Medium)",
      "model": "claude-sonnet-4-5-20250929-thinking-10000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },
    {
      "model_display_name": "CC: Sonnet 4.5 (High)",
      "model": "claude-sonnet-4-5-20250929-thinking-32000",
      "base_url": "http://localhost:8317",
      "api_key": "dummy-not-used",
      "provider": "anthropic"
    },

    {
      "model_display_name": "GPT-5.1 Codex",
      "model": "gpt-5.1-codex",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.1 Codex (High)",
      "model": "gpt-5.1-codex(high)",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.1 Codex Max",
      "model": "gpt-5.1-codex-max",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.1",
      "model": "gpt-5.1",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.1 (Low)",
      "model": "gpt-5.1(low)",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.1 (High)",
      "model": "gpt-5.1(high)",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.2",
      "model": "gpt-5.2",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.2 (High)",
      "model": "gpt-5.2(high)",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.2 Codex",
      "model": "gpt-5.2-codex",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "GPT-5.2 Codex (High)",
      "model": "gpt-5.2-codex(high)",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Gemini 3 Pro",
      "model": "gemini-3-pro-preview",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Gemini 3 Pro (Image)",
      "model": "gemini-3-pro-image-preview",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Gemini 2.5 Pro",
      "model": "gemini-2.5-pro",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Gemini 2.5 Flash",
      "model": "gemini-2.5-flash",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Gemini 2.5 Flash Lite",
      "model": "gemini-2.5-flash-lite",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },

    {
      "model_display_name": "Qwen3 Coder Plus",
      "model": "qwen3-coder-plus",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    },
    {
      "model_display_name": "Qwen3 Coder Flash",
      "model": "qwen3-coder-flash",
      "base_url": "http://localhost:8317/v1",
      "api_key": "dummy-not-used",
      "provider": "openai"
    }
  ]
}

Would appreciate any pointers on how to resolve this.

Many thanks in advance!

Best,
Adrian

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[ranaroussi]

Opus 4.5 should work with Claude Code subscription. To help investigate this issue, could you provide:

1. VibeProxy version (check About in menu bar)
2. Output of http://localhost:8317/v1/models - does it list the Opus models?
3. VibeProxy logs (Help > Show Logs) - any errors when trying to use Opus?
4. Exact model name you're using in your config (e.g., claude-opus-4-5-20251101 vs claude-opus-4-5-20251101-thinking-10000)
5. Does Sonnet work with the same setup?

Also try:

# Test directly via curl
curl http://localhost:8317/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-opus-4-5-20251101", "messages": [{"role": "user", "content": "hi"}]}'

This will help us understand if the issue is in model routing, authentication, or the Factory config.

[ranaroussi]

Friendly reminder: This issue will be closed in 7 days if we don't receive the requested information. Please provide the details above so we can help resolve your issue.

[adriangmuender]

HI! And thanks for the interaction!

After having checked http://localhost:8317/v1/models I saw that there was no claude-opus-4-5-20251101 in the output. So I simply installed the latest version of VibeProxy and now it works again! Previously I was on version v1.0.6 and now I'm on 1.8.40.

Best,
Adrian