bug: deprecated models no longer usable

[Minh141120]

Describe the Bug

Cohere models are now deprecated and no longer work for chatting. Attempting to use them results in errors since the endpoints have been removed.

Deprecated models:

• command-r-plus
• command-r
• command
• command-light
• command-light-nightly

Reference: https://docs.cohere.com/docs/deprecations#2025-09-15-various-older-command-models-a-number-of-endpoints-all-of-fine-tuning

Steps to Reproduce

1. Select one of the deprecated Cohere models (e.g., command-r-plus) from Cohere provider (need to input api key)
2. Attempt to start a chat.
3. Observe the modeil fails to respond

Screenshots / Logs

Operating System

• MacOS
• Windows
• Linux

[Minh141120]

Deprecated models:

OpenAI:

• model_not_found: 404 The model gpt-4.5-preview-2025-02-27 does not exist or you do not have access to it.
• model_not_found: 404 The model gpt-4-32k does not exist or you do not have access to it.
• model_not_found: 404 The model gpt-4-32k-0613 does not exist or you do not have access to it.

Gemini:

• {"error":{"message":"{\n "error": {\n "code": 404,\n "message": "models/gemini-1.5-flash is not found for API version v1beta, or is not supported for generateContent.
• {"error":{"message":"{\n "error": {\n "code": 404,\n "message": "models/gemini-1.5-flash-8b is not found for API version v1beta, or is not supported for generateContent.

Mistral:

• HTTP error! status: 400 Response:
  {"object":"error","message":"Invalid model: codestral-mamba-2407","type":"invalid_model","param":null,"code":"1500"}

Groq:

• model_decommissioned: 400 The model llama3-70b-8192 has been decommissioned and is no longer supported. Please refer to https://console.groq.com/docs/deprecations for a recommendation on which model to use instead.
• model_decommissioned: 400 The model llama3-8b-8192 has been decommissioned and is no longer supported. Please refer to https://console.groq.com/docs/deprecations for a recommendation on which model to use instead.

HF:

• model_not_supported: 400 The requested model 'moonshotai/Kimi-K2-Instruct' is not supported by provider 'groq'.