Best LLMs for Customer Support (2026)
Function-calling models ideal for customer support chatbots and agentic workflows. Ranked by BFCL tool-use performance with MMLU as a fallback.
| # | Model | Input $/1M | Output $/1M | |
|---|---|---|---|---|
| 1 | Claude Opus 4.5 ReasoningVisionTools | $5.00 | $25.00 | |
| 2 | Claude Sonnet 4.5 ReasoningVisionTools | $3.00 | $15.00 | |
| 3 | Gemini 3 Pro VisionTools | $2.00 | $12.00 | |
| 4 | Claude Haiku 4.5 VisionTools | $1.00 | $5.00 | |
| 5 | Kimi K2.5 Tools | $0.38 | $1.72 | |
| 6 | Gemini 2.5 Flash VisionTools | $0.30 | $2.50 | |
| 7 | GPT-5 Mini VisionTools | $0.25 | $2.00 | |
| 8 | GPT-4.1 VisionTools | $2.00 | $8.00 | |
| 9 | GPT-4.1 Mini VisionTools | $0.40 | $1.60 | |
| 10 | Mistral Large 2 VisionTools | $0.48 | $1.50 | |
| 11 | DeepSeek V3 Tools | $0.10 | $0.28 | |
| 12 | GPT-4 Turbo VisionTools | $5.00 | $15.00 | |
| 13 | Mistral 7B Instruct v0.3 Tools | $0.20 | $0.20 | |
| 14 | Claude Opus 4.7 ReasoningVisionTools | $5.00 | $25.00 | |
| 15 | Claude Opus 4.7 Batch ReasoningVisionTools | $2.50 | $12.50 | |
| 16 | Gemma 4 26B A4B IT Tools | $0.08 | $0.35 | |
| 17 | Gemma 4 31B IT Tools | $0.13 | $0.38 | |
| 18 | Trinity-Large-Thinking ReasoningTools | $0.22 | $0.85 | |
| 19 | GLM-5V-Turbo ReasoningVisionTools | $1.20 | $4.00 | |
| 20 | GLM-5.1 ReasoningTools | $0.95 | $3.15 |