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About

Agent Builder is part of OpenAI’s tooling for constructing agentic applications, systems that use large language models to perform multi-step tasks autonomously, with governance, tool integration, memory, orchestration, and observability baked in. The platform offers a composable set of primitives—models, tools, memory/state, guardrails, and workflow orchestration- that developers assemble into agents capable of deciding when to call a tool, when to act, and when to halt and hand off control. OpenAI provides a new Responses API that combines chat capabilities with built-in tool use, along with an Agents SDK (Python, JS/TS) that abstracts the control loop, supports guardrail enforcement (validations on inputs/outputs), handoffs between agents, session management, and tracing of agent executions. Agents can be augmented with built-in tools like web search, file search, or computer use, or custom function-calling tools.

About

OpenRouter is an AI model routing platform that gives developers access to hundreds of models through a single unified API. It connects users with models from providers such as OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, Qwen, xAI, and many others. The platform supports text, image, video, and audio generation while allowing developers to use one API key and a consistent interface across providers. OpenRouter can route requests based on price, performance, and availability, with fallback options that help maintain service when a provider experiences downtime. It also offers configurable data policies so organizations can control which providers receive prompts and how requests are handled. Developers can purchase credits, choose from more than 500 active models across over 80 providers, and integrate OpenRouter using an OpenAI-compatible API.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Developers and engineering teams in search of a tool for composing workflows, integrating tools, managing memory, and observing behavior in their agentic systems

Audience

AI developers, software teams, startups, enterprises, and agent builders that want unified access to many AI models while optimizing cost, performance, reliability, and provider flexibility

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

Free
Pay-as-you-go (5.5%) and Enterprise plans available
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 4.0 / 5
support 4.0 / 5

Pros & Cons from Real Users

Pros

  • Instead of getting married to ChatGPT or Claude and being locked into that relationship, OpenRouter is way more polyamorous. LMAO. And it's less messy than the real life relationship version. I can use different LLMs for different types of tasks and you learn quickly which LLMs excel in certain areas. In the beginning I did multichats where I'd ask 1 question to 2 or 3 bots at a time (their multichat features) and whoever gave the best answer was who I continued interacting with. I guess it's more like speed dating than polyamory. But the bottom line is, instead of spending $20-$30/mo with one system, I am spending a la carte, which is WAAAAYYYY cheaper, and using the right tool at any given moment. It just takes discipline to copy and paste your chats elsewhere. It does give you a copy markdown button to make it easier. And if you enable markdown in Google docs, there is a paste as markdown feature that makes it look like RTF when it's pasted in, with no codes. Because the chats are browser bound, they are stuck on one computer and everybody is on a bunch of different devices these days. So pasting into Google Docs is the best bet for portability all around. Privacy isn't an issue, because they aren't storing your chats! For some people, this is a big plus. To use the service, they charge you a 9 or 10% charge for however much money you put towards tokens. So if I refill for $10, the total is $10.90, with $10 of usable token for whichever LLM I feel like using. Keep in mind, there are free LLMs too which you can choose and never pay. When you add models, type 'free' in the search box and you'll see several free, from Maverick to Scout to Gemma, etc. It will make you feel like a serious power user and you'll feel smarter everytime you use it. It also has access to the secret parameters that the online LLMs don't show you, like Temperature, Top P, Frequency penalty, etc. It can save you money if you tell it ahead of time what type of vocab you like or how divergent you want the suggestions to be, vs. training ChatGPT or Gemini manually.

Cons

  • The chats aren't persistent - you must copy and save them elsewhere before you close a browser window, or all that info from that chat is gone.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

OpenAI
Founded: 2015
United States
platform.openai.com/docs/guides/agent-builder

Company Information

OpenRouter
Founded: 2023
United States
openrouter.ai/

Alternatives

Alternatives

AgentKit

AgentKit

OpenAI
Router

Router

Ramp

Categories

Categories

Integrations

ChatKit
OpenAI
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GLM-5.3
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Grok 4
Grok 4.1
Grok 4.1 Thinking
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Ming-Flash Omni 2.0
Nano Banana 2 Lite
Sakana Fugu Ultra
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Integrations

ChatKit
OpenAI
APIPark
Fugu Cyber
GLM-5.3
GPT-5.1 Pro
Gemini 2.5 Flash Image
Grok 4
Grok 4.1
Grok 4.1 Thinking
Liquid Apollo
Ming-Flash Omni 2.0
Nano Banana 2 Lite
Sakana Fugu Ultra
ShipAhead
Spawn
TypeScript
Whim
YeeroAI
omp
Claim Agent Builder and update features and information
Claim Agent Builder and update features and information
Claim OpenRouter and update features and information
Claim OpenRouter and update features and information