Mintplex-Labs/anything-llm · error · Error

DeepSeek chat: ${this.model} is not valid for chat completio

Error message

DeepSeek chat: ${this.model} is not valid for chat completion!

What it means

Thrown by getChatCompletion when isValidChatCompletionModel returns false. Unlike cache-based providers, DeepSeek's validator calls this.openai.models.list() and checks whether any returned model id matches this.model. If the DeepSeek API is unreachable, returns an empty list (the .catch fallback yields {data:[]}), or the model id is not in the live list, the guard rejects the call.

Source

Thrown at server/utils/AiProviders/deepseek/index.js:99

  /**
   * Parses and prepends reasoning from the response and returns the full text response.
   * @param {Object} response
   * @returns {string}
   */
  #parseReasoningFromResponse({ message }) {
    let textResponse = message?.content;
    if (
      !!message?.reasoning_content &&
      message.reasoning_content.trim().length > 0
    )
      textResponse = `<think>${message.reasoning_content}</think>${textResponse}`;
    return textResponse;
  }

  async getChatCompletion(messages = null, { temperature = 0.7 }) {
    if (!(await this.isValidChatCompletionModel(this.model)))
      throw new Error(
        `DeepSeek chat: ${this.model} is not valid for chat completion!`
      );

    const result = await LLMPerformanceMonitor.measureAsyncFunction(
      this.openai.chat.completions
        .create({
          model: this.model,
          messages,
          temperature,
        })
        .catch((e) => {
          throw new Error(e.message);
        })
    );

    if (
      !result?.output?.hasOwnProperty("choices") ||
      result?.output?.choices?.length === 0

View on GitHub (pinned to 526360e320)

Solutions

1. Verify the model id against the live GET https://api.deepseek.com/v1/models response using the same API key.
2. Check that DEEPSEEK_API_KEY is valid — if it is expired, models.list() silently returns empty and every model fails.
3. Default to 'deepseek-chat' (the constructor fallback) if unsure.
4. If the API is temporarily unreachable, retry — the validation is network-dependent and will pass once connectivity is restored.

// Pre-validate the model against DeepSeek's live list
const models = await fetch('https://api.deepseek.com/v1/models', {
  headers: { Authorization: `Bearer ${process.env.DEEPSEEK_API_KEY}` },
}).then(r => r.json()).catch(() => ({ data: [] }));
const isValid = models.data?.some(m => m.id === modelId);
if (!isValid) throw new Error(`Model ${modelId} not found in DeepSeek /v1/models`);

try {
  return await deepseek.getChatCompletion(messages, { temperature });
} catch (e) {
  if (/is not valid for chat completion/i.test(e.message))
    throw new Error(`DeepSeek model "${modelId}" invalid or API unreachable. Check DEEPSEEK_API_KEY and model id.`);
  throw e;
}

When it happens

Trigger: DEEPSEEK_MODEL_PREF is set to a model id not returned by GET /v1/models (e.g. a typo or a model DeepSeek retired); the models.list() call fails due to network/auth issues, causing the catch to return an empty data array, which makes every model id fail validation.

Common situations: DeepSeek deprecating 'deepseek-coder' or similar legacy ids; transient network failure to api.deepseek.com during the models.list() call masking a valid model as invalid; an expired API key causing models.list() to 401 and silently return an empty list.

Related errors

• CometAPI chat: ${this.model} is not valid for chat completio
• e.message
• Invalid response body returned from DeepSeek: ${JSON.stringi
• Docker Model Runner chat: ${this.model} is not valid or defi
• FireworksAI chat: ${this.model} is not valid for chat comple

AI-assisted analysis of Mintplex-Labs/anything-llm@526360e320 (2026-08-13). Data as JSON: /api/errors/cd8ce71f53183558. Report an issue: GitHub.