Best LLMs for Agents (2026)

Top large language models for building autonomous AI agents, featuring strong tool use, function calling, and multi-step reasoning capabilities.

#1Claude Sonnet 4

Anthropic

ELO 1280

Input

$3.00/M

Output

$15.00/M

VisionJSON ModeFunctionsMultimodal

#2Claude Opus 4

Anthropic

ELO 1330

Input

$15.00/M

Output

$75.00/M

VisionJSON ModeFunctionsMultimodal

#3GPT-4.1

OpenAI

ELO 1290

Input

$2.00/M

Output

$8.00/M

VisionJSON ModeFunctionsMultimodalCode Exec

#4Gemini 2.5 Pro

Google

ELO 1340

Input

$1.25/M

Output

$10.00/M

VisionJSON ModeFunctionsMultimodalCode Exec

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