The Cheaper, OpenAI-Compatible OpenAI API Alternative
The OpenAI API is the reference for hosted LLMs; Assisters is an OpenAI-compatible API built on its own 9 proprietary models. Because Assisters speaks the OpenAI format, you can migrate by pointing the base URL at https://api.assisters.dev/v1, swapping your API key, and using an assisters-* model name. For teams that want lower per-token pricing, a genuine free tier, and zero training on customer data, the comparison below lays out pricing, models, and compatibility.
Why switch from the OpenAI API
Teams switch for lower per-token cost — Assisters Chat v1 input is $0.10/M versus $0.40/M for OpenAI's GPT-4.1 Mini — a drop-in OpenAI-compatible API that works with the OpenAI SDKs, and a privacy-first stance that never trains on your data. Assisters also ships a free tier of 100K tokens per month and a 99.9% uptime SLA.
Assisters vs OpenAI: pricing & features
Side-by-side comparison. Prices are per 1M tokens. Chat rows compare Assisters Chat v1 with OpenAI GPT-4.1 Mini; embeddings compare Assisters Embed v1 with OpenAI text-embedding-3-small. OpenAI figures verified June 2026.
| Feature | Assisters | OpenAI API |
|---|---|---|
| Input price (per 1M tokens) | $0.10/M | $0.40/M (GPT-4.1 Mini) |
| Output price (per 1M tokens) | $0.20/M | $1.60/M (GPT-4.1 Mini) |
| Embeddings price (per 1M tokens) | $0.01/M | $0.02/M (text-embedding-3-small) |
| Free tier | 100K tokens/mo | None |
| Uptime SLA | 99.9% | No public SLA |
| Latency (P95) | <100ms P95 | Varies |
| Models offered | 9 proprietary | GPT-4.1 family |
| Capability | Assisters | OpenAI API |
|---|---|---|
| OpenAI-compatible API |
OpenAI-compatible: migrate in one line
Assisters speaks the OpenAI API format, so most projects migrate with three changes: set the base URL to https://api.assisters.dev/v1, swap your OpenAI key for your Assisters API key, and use an assisters-* model name such as assisters-chat-v1. The existing OpenAI SDK code stays the same.
Is Assisters cheaper than OpenAI?
On a like-for-like basis, yes. Assisters Chat v1 costs $0.10/M input and $0.20/M output, versus $0.40/M input and $1.60/M output for OpenAI's GPT-4.1 Mini. Assisters Embed v1 is $0.01/M versus $0.02/M for OpenAI's text-embedding-3-small. Assisters also adds a 100K tokens/month free tier that OpenAI does not offer.
Frequently Asked Questions
Is there a cheaper alternative to the OpenAI API?
Yes. Comparing Assisters Chat v1 to OpenAI's GPT-4.1 Mini, Assisters charges $0.10 per 1M input tokens versus $0.40 at OpenAI, and $0.20 per 1M output tokens versus $1.60. For embeddings, Assisters Embed v1 is $0.01 per 1M tokens versus $0.02 for OpenAI's text-embedding-3-small.
Is Assisters OpenAI-compatible?
Yes. Assisters exposes an OpenAI-compatible API, so you can keep using the existing OpenAI SDKs — set the base URL to https://api.assisters.dev/v1, use your Assisters API key, and swap to an assisters-* model name such as assisters-chat-v1.
How do I migrate from OpenAI to Assisters?
Point your OpenAI SDK client at https://api.assisters.dev/v1, replace your OpenAI key with your Assisters API key, and change the model name to an assisters-* model (for example assisters-chat-v1). No other code changes are required.
Is there a free OpenAI API alternative?
Assisters includes a free tier of 100K tokens per month with no credit card required. OpenAI's API is pay-as-you-go and requires a payment method, with no standing free tier.
Ready to Get Started?
Start free with 100K tokens per month — no credit card required. Point the OpenAI SDK at https://api.assisters.dev/v1 and you are running in minutes.