How to Pick the Right LLM for Every Task (and Save Money)
Using the most expensive model for every query is like using a sledgehammer for a thumbtack. Learn to match models to tasks and slash your AI costs without sacrificing quality.
LLM Selection Guide
Match the model to the task
Stop using GPT-4 for every little thing. Here is your cheat sheet for picking the right LLM and saving money.
Summarize an email
Use a small model like Claude Haiku or GPT-4o Mini. Fast and cheap.
Rewrite a sentence
Any model works. Pick the cheapest one available to you.
Generate a short caption
A tiny model like Llama 3.2 3B does this perfectly for pennies.
Debug a code snippet
Use a strong model like Claude 3.5 Sonnet or GPT-4o. One good answer beats ten cheap tries.
Analyze a dataset
Premium models handle multi-step analysis without losing context.
Write a business plan
You need deep reasoning and long output. Spring for the big model.
Write a poem or story
Creative tasks benefit from larger models with more personality.
Brainstorm ideas
Medium models are fine. They still give diverse and useful suggestions.
Generate marketing copy
A mid-tier model with good instructions beats a premium model with none.
Set a default cheap model
Route 80% of queries to a small model. Upgrade only when needed.
Use fallback chains
Try a cheap model first. If it fails, retry with a bigger one.
Monitor token usage
Track per-model spend weekly. Cut models that get expensive without results.
Common mistakes that burn money
- +Using GPT-4 to draft a grocery list wastes $0.10 per query
- +Assuming bigger models always give better answers for simple tasks
- +Not caching common responses β you pay for the same answer every time
Key Takeaways
- 1Match model size to task complexity to avoid wasting tokens and money
- 2Cheap models handle 80% of daily tasks just as well as premium ones
- 3Routing simple queries to small models can cut costs by 90%
- 4Premium models are best for creative writing, analysis, and complex reasoning
- 5Testing a model on a sample task reveals its true fit faster than specs
- 6Set usage limits per model to prevent surprise bills from runaway agents
LLM Selection Checklist
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