Multi-Provider LLM Cost Analysis: Finding the Cheapest Brain for Your Task
Not all tokens cost the same. A prompt that costs $0.50 on Claude might cost $0.08 on Gemini or $0.03 on DeepSeek. The challenge is knowing which model to reach for without sacrificing quality.
The Pricing Landscape (Per 1M Tokens, April 2026)
| Model | Input | Output | Context Window |
|---|---|---|---|
| Claude 3.5 Sonnet | $3.00 | $15.00 | 200K |
| GPT-4o | $2.50 | $10.00 | 128K |
| Gemini 1.5 Pro | $1.25 | $5.00 | 2M |
| GPT-4o-mini | $0.15 | $0.60 | 128K |
| Gemini 1.5 Flash | $0.075 | $0.30 | 1M |
| DeepSeek V3 | $0.07 | $0.28 | 128K |
Cost Drivers Beyond Per-Token Pricing
1. Output Verbosity
Some models are chatty. Claude 3.5 Sonnet tends to write comprehensive explanations, often 2-3x the token count of Gemini Flash for the same task. Your effective cost is input + output, so a cheaper input rate with a verbose model can still be expensive.
2. Context Caching
Anthropic and Gemini both support prompt caching. For repetitive workloads — like coding assistants with the same system prompt — caching can reduce costs by 90%.
3. Thinking Budgets
Claude's extended thinking mode burns extra tokens on internal reasoning before emitting output. This improves quality on complex tasks but doubles or triples the effective cost. Use it only when reasoning depth matters.
Decision Framework
Use this flowchart for every prompt:
- Simple classification/extraction? → GPT-4o-mini or Gemini Flash
- Creative writing with nuance? → Claude 3.5 Sonnet
- Multimodal (images + text)? → GPT-4o or Gemini Pro
- Massive context (100K+)? → Gemini 1.5 Pro (2M window)
- Budget constrained prototype? → DeepSeek V3
The AIWorkbench.dev Cost Calculator
Our built-in calculator normalizes these rates and estimates your monthly spend based on daily usage patterns. It factors in context caching, average output length per model, and your selected providers.
Key Takeaway
The most expensive model is the one you use for every task. Match the model to the cognitive load of the prompt. Your wallet is a function of your routing strategy.