Best AI tools to access llm models
| Tool | What it does | Pricing | Free tier | Refunds |
|---|---|---|---|---|
| OpenRouter | A unified interface and marketplace to access and use various AI models through a single API. | Free tier | Yes | 1 day |
| Inworld AI | Realtime voice AI platform for text-to-speech, speech-to-speech, and LLM routing built for conversational applications. | Free tier; paid from $25/mo | Yes | None stated |
| Blackbox | High-trust inference layer for teams that deploy at scale. | Free tier | Yes | — |
| Serno | Assembles AI experts to research and debate questions, providing a navigable map instead of a simple report. | Free tier; paid from $20/mo | Yes | — |
| Hunch | A workspace for teams to use all the top AI models, tackle complex projects, and be more productive. | Free tier * | Yes | — |
— means the vendor does not state it on the pages we read.
* pricing not verified against the vendor's pricing page.
OpenRouter
Visit OpenRouteropenrouter.aiCancellation & refund terms for OpenRouter
A unified interface and marketplace to access and use various AI models through a single API.
Access all major models through a single, unified interface.
Pricing, in their words: “Currently, OpenRouter requires users to purchase Credits to make API calls and access the Service, with a minimum and maximum purchase amount of $5 and $25,000 per transaction, respectively.” (pricing)
Subscription terms they state: cancel in-app · auto-renews · 1-day refund window (source)
Limits the vendor states:
- Access Restricted Models
Inworld AI
Visit Inworld AIinworld.ai
Realtime voice AI platform for text-to-speech, speech-to-speech, and LLM routing built for conversational applications.
One API that intelligently routes requests across OpenAI, Anthropic, Google, and 220+ models.
Pricing, in their words: “Choose a plan and get credits each month to use across TTS, STT, and LLMs.” (pricing)
Subscription terms they state: cancel in-app · auto-renews · states no refunds (source)
No usage limits stated on the pages we read.
Blackbox
Visit Blackboxblackbox.ai
High-trust inference layer for teams that deploy at scale.
Route across 300+ models and send only the data that each task requires.
Pricing, in their words: “Commit annual enterprise spend for a discount on every token: the balance decreases as your teams consume it” (pricing)
No usage limits stated on the pages we read.
Serno
Visit Sernoserno.ai
Assembles AI experts to research and debate questions, providing a navigable map instead of a simple report.
Switch models mid-conversation
— serno.ai
Pricing, in their words: “$40$20/ first month Then $40/month 7,500 credits/mo” (pricing)
No usage limits stated on the pages we read.
A workspace for teams to use all the top AI models, tackle complex projects, and be more productive.
Source: hunch.tools
Pricing: Free tier (pricing)
No usage limits stated on the pages we read.
FAQ
Is there a free tool to access llm models?
Yes — OpenRouter, Inworld AI, Blackbox, Serno, Hunch offer a free tier.
What is the cheapest paid option to access llm models?
Serno starts at $20/month.
Which of these have an API?
OpenRouter, Inworld AI, Blackbox document a developer API.
How do I cancel these subscriptions?
OpenRouter: cancel in-app; Inworld AI: cancel in-app. Blackbox, Serno, Hunch do not state a cancellation route on the pages we read.
Can I get a refund?
OpenRouter states a 1-day refund window; Inworld AI states it does not offer refunds. The others (Blackbox, Serno, Hunch) do not state a refund policy on the pages we read.
Do these subscriptions auto-renew?
OpenRouter, Inworld AI state that paid plans renew automatically. Check the billing page before subscribing; the rest do not state it either way.
Sources
Every fact above was read from the vendors' own pages: