GenX supports 5 LLM providers for reply generation. Each has different strengths.

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OpenRouter

Best for: Access to 200+ models from multiple providers through a single API key. 
Key format: sk-or-v1-...
Get your key at openrouter.ai/keys Popular models:
  • anthropic/claude-3.5-sonnet — Best quality
  • meta-llama/llama-3.1-70b-instruct — Great value
  • google/gemini-pro-1.5 — Fast and capable

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OpenAI

Best for: Consistent, reliable reply quality. 
Key format: sk-...
Get your key at platform.openai.com/api-keys Available models:
  • gpt-4o — Most capable
  • gpt-4o-mini — Fast and cost-effective

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Anthropic

Best for: Natural tone matching, human-like replies. 
Key format: sk-ant-...
Get your key at console.anthropic.com Available models:
  • claude-sonnet-4-6 — Best balance
  • claude-haiku-4-5-20251001 — Fastest

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Groq

Best for: Ultra-fast generation for high-volume campaigns. 
Key format: gsk_...
Get your key at console.groq.com/keys Available models:
  • llama-3.1-70b-versatile — Best quality
  • mixtral-8x7b-32768 — Great speed

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Google

Best for: Cost-effective with strong capabilities. 
Key format: AIza...
Get your key at aistudio.google.com/apikey Available models:
  • gemini-2.5-pro — Most capable
  • gemini-2.5-flash — Fast and affordable

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Testing Your Key

After entering your API key in Settings, click Test. GenX sends a simple prompt to validate the key and model access. If the test fails, check:
  1. The key is correctly copied (no extra spaces)
  2. The key has not expired
  3. You have sufficient credits/quota
  4. The selected model is available on your plan