One of the most common questions when setting up an auto blog is: "Which AI model should I use? Do I need to pay?" The answer depends on your niche, quality requirements, and budget.
Current Categories of AI Models
Free AI Models (via OpenRouter)
- Llama 3.1 8B/70B (Meta): Powerful, open-source, free on many platforms
- Gemma 3 27B (Google): Good quality for everyday content
- Mistral 7B/Nemo: Lightweight, fast, suitable for batch generation
- Qwen 2.5 72B: Particularly good with Vietnamese and Chinese content
Paid AI Models
- GPT-4o (OpenAI): $5/$15 per 1M tokens (input/output). High quality, most widely used
- Claude 3.5 Sonnet (Anthropic): $3/$15 per 1M tokens. Best for long-form content
- Gemini 1.5 Pro (Google): $1.25/$5 per 1M tokens. Good, large context window
- GPT-4o mini: $0.15/$0.60 per 1M tokens. Balance between quality and cost
Content Quality Comparison by Niche
| Niche/Requirement | Free (Llama/Gemma) | Paid (GPT-4o/Claude) |
|---|---|---|
| Simple how-to guides | Sufficient ✅ | Better but not necessary |
| Product reviews | Sufficient ✅ | More detailed and persuasive |
| SEO long-form 3000+ words | Average ⚠️ | Noticeably better ✅ |
| Technical/expert content | Poor ❌ | Good ✅ |
| Creative writing | Poor ❌ | Good ✅ |
| Vietnamese content | Decent (Qwen) ✅ | Good (GPT/Claude) ✅ |
Calculating Real Costs for Auto Blogging
Assuming you write 200 articles/month, each 1,000 words (~1,500 output tokens + 500 prompt tokens):
- Free model (Llama/Gemma): $0/month (rate-limited but sufficient for most use cases)
- GPT-4o mini: ~$0.60 for 200 articles → very affordable
- GPT-4o: ~$6 for 200 articles
- Claude 3.5 Sonnet: ~$4.50 for 200 articles
Conclusion: AI model costs are not a major concern. At 200 articles/month, even GPT-4o only costs ~$6. Your real budget should go toward your domain, hosting, and SEO tools.
AutoBlogspot's Recommendations
AutoBlogspot supports both free and paid models via OpenRouter:
- Just starting out: Use Llama 3.1 70B or Qwen 2.5 72B (free) to test your concept
- Scaling to production: Upgrade to GPT-4o mini ($0.15/$0.60) — the perfect balance
- High-quality niche: Claude 3.5 Sonnet for pillar content and key articles
- Mixed strategy: Free model for cluster content, paid model for pillar content
See also: AutoBlogspot vs Manual Writing Comparison.
