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The Cheapest LLM APIs in 2026: A Complete Ranking

We compared every major LLM API provider to find the best value. Here's the full ranking.

By Raw Cost (cheapest first)

Budget Tier (under $1 per 1M tokens)

1. Mistral Small 4: $0.10 in / $0.30 out — Cheapest option for simple tasks
2. Gemini 2.0 Flash: $0.10 in / $0.40 out — Best budget option with large context
3. GPT-4o mini: $0.15 in / $0.60 out — Best budget option from OpenAI
4. Claude Haiku 4.5: $1.00 in / $5.00 out — Premium budget option

Premium Tier ($1+ per 1M tokens)

1. Mistral Large 3: $2.00 in / $6.00 out — Best value premium
2. GPT-4o: $2.50 in / $10.00 out — Most popular premium
3. Gemini 2.5 Pro: $1.25 in / $10.00 out — Best for long context
4. Claude Sonnet 4: $3.00 in / $15.00 out — Best for complex reasoning

By Value (quality per dollar)

Raw cost isn't everything. A model that's 2x more expensive but produces 3x better output is actually cheaper per unit of quality.

The cheapest API is the one that gets the job done correctly on the first try.

For most production workloads, we recommend starting with GPT-4o mini or Gemini 2.0 Flash and upgrading only when needed.

Context Window Considerations

If you need to process long documents, Gemini 2.5 Pro (1M tokens) and Claude Sonnet 4 (200K tokens) offer significantly larger context windows, potentially eliminating the need for chunking and summarization.