LLM Chatbot Hosting: Cost at 100K Messages/Month
What does it cost to run llm chatbot hosting at 100K messages/month? Self-hosted dedicated GPU vs API provider pricing.
Side-by-Side: Monthly Costs at 100K Messages
| Provider | Monthly Cost | Pricing Model | vs GigaGPU |
|---|---|---|---|
| GigaGPU (RTX 4060 Ti) | £69/mo | Fixed | — |
| OpenAI GPT-4o-mini | £85/mo | Per-messages | 19% cheaper with GigaGPU |
| Anthropic Claude Haiku | £75/mo | Per-messages | 8% cheaper with GigaGPU |
| Together.ai LLaMA 3 8B | £35/mo | Per-messages | API is cheaper at this volume |
What These Numbers Actually Mean
At 100K messages/month, you are right at the inflection point where self-hosting starts to make financial sense against the big-name APIs. An RTX 4060 Ti at £69/month undercuts OpenAI by 19% and Anthropic by 8%. Together.ai is still cheaper at £35/month — but that changes rapidly the moment your volume increases, and you lose control over latency, privacy, and uptime.
The real value proposition at 100K messages is not cost alone — it is cost predictability. Your £69/month bill stays £69/month whether you handle 80K messages or 130K. API providers will happily charge you for every overage.
Annual savings: Up to £192/year versus OpenAI, with the gap widening significantly if your usage grows.
Why Self-Hosting Wins at This Volume
- Growth runway: At 100K messages, you are likely growing. A dedicated GPU absorbs 5x volume increases with zero cost increase. API bills grow linearly.
- Data stays on your server: No messages transit through OpenAI or Anthropic infrastructure. Essential for regulated industries and privacy-conscious users.
- Sub-100ms inference: Direct GPU access eliminates API round-trip overhead. Your chatbot responds faster than any hosted API can.
- Complete stack control: Fine-tune models on your domain data, adjust quantisation for speed, optimise batching — impossible with API providers.
When APIs Still Make Sense
- Unpredictable volume: If you swing between 10K and 100K monthly, pay-per-use avoids paying for idle capacity.
- Zero ops appetite: API providers manage everything. If your team cannot spare engineering time for infrastructure, that has value.
- Model experimentation: Testing GPT-4o today and Claude tomorrow takes minutes with APIs. Self-hosting requires model deployment work.
Hardware Recommendation
For 100K messages/month, the RTX 4060 Ti at £69/month is the ideal fit. Its 16 GB VRAM runs any 7B-8B parameter model with headroom for 20-30% burst capacity. GigaGPU servers ship pre-configured with CUDA, Docker, and popular inference frameworks — deploy your chatbot in under 15 minutes.
Lock In Your Chatbot Costs
Flat £69/month for 100K+ messages. No per-message fees, no surprise invoices, no rate limits slowing down your users.
