manifest.build
Open source LLM router connecting AI agents to any provider.
- Freemium· from $19/month
- Web
- API Available
- Open Source
What is manifest.build?
manifest.build is a Model Routing tool. Open source LLM router connecting AI agents to any provider. manifest.build is freemium: it has a free plan, and paid plans start at $19/month. It is available on Web App, Windows, macOS and Linux. It is aimed at ai builders, teams & startups and platforms & providers.
Open source LLM router that connects AI agents to any provider. Supports subscriptions, pay-per-token, local models, and custom providers.
Built for ai builders, teams & startups and platforms & providers.
Features
AI Builders
Teams & Startups
Platforms & Providers
Model Fallbacks
Full Body Logs
Autofix
Self-Host
Local Models
Easy Parameter Setup
Cost Visualization
Built in the Open
Use cases
- Connect AI agents to any provider
- Manage subscriptions and pay-per-token models
- Support local models and custom providers
Who it's for
- AI Builders
- Teams & Startups
- Platforms & Providers
Pros & cons
Pros
- Public API available
- Free plan available
- Integrates with OpenAI, Anthropic
Cons
No documented limitations yet.
Pricing
Freemium — paid plans start at $19/month.
| Plan | Price |
|---|---|
| Free | Free |
| Pro | $19 / month |
AI models
- GPT 5
- Claude Opus 5
- Gemini 3.6 Flash
- DeepSeek V4.1
Developer & API
Public REST API available
- Authentication
- API Key, Bearer Token
Open source
Security & compliance
- SSO
- SAML
- Encryption
- Data deletion
As stated on manifest.build's website — not independently verified by AiByts.
FAQ
What is manifest.build?
manifest.build is a Model Routing tool. Open source LLM router connecting AI agents to any provider. Open source LLM router that connects AI agents to any provider. Supports subscriptions, pay-per-token, local models, and custom providers.
Is manifest.build free?
manifest.build has a free plan; advanced features require a paid plan.
How much does manifest.build cost?
manifest.build offers 2 plans: Free (Free) and Pro ($19 / month).
Does manifest.build have an API?
Yes, manifest.build offers a public REST API for building custom integrations.
What platforms does manifest.build support?
manifest.build is available on Web App, Windows, macOS and Linux.
Who should use manifest.build?
manifest.build is built for ai builders, teams & startups and platforms & providers. Common uses: connect AI agents to any provider, manage subscriptions and pay-per-token models and support local models and custom providers.
What does manifest.build integrate with?
manifest.build integrates with OpenAI and Anthropic.
Is manifest.build open source?
Yes, manifest.build is open source.
What are the best alternatives to manifest.build?
Similar tools on AiByts include PromptLayer, HandyAI, Twigg, Oracle AI and GPT4All.
manifest.build news & updates
The AI Agent API Reliability Stack, September 2026
A market map of the tools that help AI agents understand, call, test and monitor APIs reliably: 44 products across Understand, Build, Verify and Run.
manifest.build Blog4 min read
Best oasdiff Alternatives in 2026
The best oasdiff alternatives in 2026, for API vendors and API consumers: what each tool watches, what it produces and what it costs.
manifest.build Blog8 min read
Manifest gateway now has a CLI and a remote MCP server
Run every Manifest gateway task from the terminal with mnfst, or connect Claude, Cursor, Codex, and other MCP clients over OAuth, without opening the dashboard.
manifest.build Blog3 min read
Manifest is now available as an n8n community node
Install n8n-nodes-manifest to use Manifest as the chat model behind n8n AI Agents, or call Chat Completions and Responses directly from a workflow, on Manifest Cloud or self-hosted.
manifest.build Blog3 min read
Manifest is taking a new direction
Manifest is becoming an autofix solution for APIs in general: it reads the error, corrects the request and retries it in less than a second.
manifest.build Blog2 min read
Everyone is building LLM routers, we deprecated ours
We don't believe in model routing anymore. For most use cases, sticking to a single battle-tested model is the best thing you can do.
manifest.build Blog3 min read
Request logs are back
Request logs are back, opt-in at the agent level. See the full payload on every provider call, including messages, tool usage, and raw JSON.
manifest.build Blog2 min read
Your failing requests now fix themselves
Autofix is live on Manifest Cloud. When a provider rejects a request with a fixable error, Manifest patches it and sends it again. Here's what shipped.
manifest.build Blog2 min read
The Biggest Reliability Problem in AI Isn't Hallucinations Anymore
In production, the biggest AI problem isn't what the model says. It's whether users get an answer at all. Datadog's 2026 report puts LLM failure at 5%, and 60% of it is rate limits. Reliability is the next competitive advantage.
manifest.build Blog3 min read
Introducing paid plans for Manifest Cloud
Manifest Cloud now has a Pro plan at $19/month. The Free plan stays free with all features included. Here is what changes and what stays the same.
manifest.build Blog3 min read
The reliability stack for LLM agents: tools and methods
A request can fail before you send it, while it runs, or after it returns. This is a directory of tools and methods grouped by what each one does.
manifest.build Blog3 min read
This will get you banned from your ChatGPT subscription
A ChatGPT subscription is cheap inference, but strictly personal. Sharing, automating, serving other users, or reselling access can get you banned.
manifest.build Blog2 min read
ChatGPT Plus: Enjoy $200 of Tokens for $20 While It Lasts
OpenAI lets you spend your $20 ChatGPT Plus subscription inside third-party harnesses like OpenCode and Pi — worth ~$200 in tokens. Here's why it may not last.
manifest.build Blog3 min read
The errors that actually break LLM agents in production
Your agent ran clean in the demo. Friday it returns 400s. Here are the six plumbing failures we see most in Manifest's logs.
manifest.build Blog4 min read
I Stopped Prompting My Agent. Now I Design the Loop That Prompts It.
How a Python script, four files, and a strict eval turned a personal AI agent from something I operated into something I supervise.
manifest.build Blog5 min read
We are deprecating our rule-based routing
Manifest is deprecating rule-based complexity and specificity routing on September 1, 2026. Why, and how to switch to the default or custom routing tiers.
manifest.build Blog3 min read
Announcing modelparams.dev, the open-source model parameter database
modelparams.dev is a free, open-source database of parameters for popular AI models. Browse the UI, fetch the API, or get type-safe configs in TypeScript.
manifest.build Blog3 min read
Run Claude Code on your ChatGPT Plus subscription
Use Manifest to route Claude Code requests through your existing ChatGPT Plus subscription instead of paying for API keys on top.
manifest.build Blog3 min read
Details are compiled from manifest.build's website and public sources, last verified Oct 3, 2026. Features and pricing change — confirm on the official site before you buy.
Try manifest.build
Freemium · from $19/month
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