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Top 8 OpenAI Assistants API Alternatives in 2026

Looking for something different? Here are the best tools like OpenAI Assistants API.

🧰

OpenAI Assistants API

Paid★ 4.6

Build AI assistants with tools

🔄 Automation & Workflows
#1
🤖

OpenAI GPTs

Paid★ 4.7

Custom AI agents

Same category with shared features: agents

Try it →Compare
#2
🤝

Tendem AI

Paid★ 4.6

Hybrid AI agent with human experts

Same category with shared features: agents

Try it →Compare
#3
🎤

Vapi

Freemium★ 4.4

Voice AI platform

Same category with shared features: agents, API

Try it →Compare
#4
🧠

Letta

Freemium★ 4.4

Stateful LLM agents with memory

Same category with shared features: memory, agents

Try it →Compare
#5
🦾

Phidata

Freemium★ 4.3

Build AI agents with memory and tools

Same category with shared features: agents, memory

Try it →Compare
#6
🦸

SuperAGI

Free★ 4.2

Open-source agent framework

Same category with shared features: agents, tools

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#7
🔄

Arahi AI

Paid★ 4.5

Autonomous workflows across 2,800+ apps

Same category — solves similar problems

Try it →Compare
#8
📞

SkipCalls

Paid★ 4.4

AI answers your calls & books appointments

Same category — solves similar problems

Try it →Compare

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