Cheapest LLMs for function calling in 2026: ranked by reliability
GPT-4o-mini, Gemini 2.5 Flash, DeepSeek V4-Flash, and Haiku 4.5 ranked on schema errors, retry costs, and multi-turn reliability for function calling in 2026.
Tag · tool-use
GPT-4o-mini, Gemini 2.5 Flash, DeepSeek V4-Flash, and Haiku 4.5 ranked on schema errors, retry costs, and multi-turn reliability for function calling in 2026.
Function calling lets LLMs trigger your code via JSON schemas. How the loop works, when to use it over plain prompting, and the pitfalls most builders hit.