Best LLMs for Function Calling (2026)
Top AI models for agentic workflows, tool use, and API integration. Compare models with native function calling support, structured output, and JSON mode.
| # | Model | Input $/1M | Output $/1M | |
|---|---|---|---|---|
| 1 | Sarvam 30B Tools | — | — | |
| 2 | Nemotron 3 Nano Tools | — | — | |
| 3 | Leanstral 120B Tools | — | — | |
| 4 | Mistral Small 4 VisionTools | — | — | |
| 5 | Kimi K2.5 Tools | $0.5 | $2.3 | |
| 6 | Together AI - Gemma 3n-e4B Tools | $0.02 | $0.04 | |
| 7 | GPT-4.5 VisionTools | — | — | |
| 8 | Gemini 3.1 Flash-Lite Preview VisionTools | $0.25 | $1.5 | |
| 9 | Gemini 3.1 Pro Preview VisionTools | $2 | $12 | |
| 10 | Gemini 3.1 Pro VisionTools | $2 | $12 | |
| 11 | Claude Sonnet 4.6 ReasoningVisionTools | $3 | $15 | |
| 12 | Claude Sonnet 4.6 Batch ReasoningVisionTools | $1.5 | $7.5 | |
| 13 | Gemini 2.0 Ultra VisionTools | — | — | |
| 14 | Claude Opus 4.6 ReasoningVisionTools | $5 | $25 | |
| 15 | Claude Opus 4.6 Batch ReasoningVisionTools | $2.5 | $12.5 | |
| 16 | Together AI - Qwen 3.5 9B Tools | $0.1 | $0.15 | |
| 17 | Together AI - Mistral Small 3 Tools | $0.1 | $0.3 | |
| 18 | Qwen 3 Max VisionTools | $0.78 | $3.9 | |
| 19 | Grok-3 ReasoningVisionTools | $3 | $15 | |
| 20 | Gemini 3 Flash Preview VisionTools | $0.5 | $3 |