AI API Comparison: OpenAI vs Claude vs Gemini vs Ollama
In 2025, developers have access to 10+ commercial LLM APIs. Choosing the right model directly impacts quality, speed, and cost.
Full Comparison
| Provider | Model | Context | Input (1M) |
|---|---|---|---|
| OpenAI | GPT-4o | 128K | $2.50 |
| Anthropic | Claude 3.5 Sonnet | 200K | $3.00 |
| Gemini 1.5 Pro | 1M | $3.50 | |
| Ollama | Llama 3.1 8B | 128K | Free |
How to Choose
- Support chatbot — GPT-4o-mini or Claude 3 Haiku (cheap, quality)
- Document analysis — Claude 3.5 Sonnet (200K) or Gemini 1.5 Pro (1M)
- Code generation — Claude 3.5 Sonnet or GPT-4o
- Privacy — Ollama + Llama 3.1
Tip: LiteLLM provides a single OpenAI-compatible interface for 100+ LLM providers. Change providers with one line of code.