// Halo
Use GPT-5 without a ChatGPT subscription — pay per prompt on Halo
The model behind ChatGPT, served peer-to-peer on Halo. No OpenAI account, no monthly plan — pay only for the prompts you actually send.
GPT-5 is the model behind ChatGPT — and for most people the only way to reach it is an OpenAI account plus a recurring plan. That works fine if you prompt every day. It’s poor value if you don’t, and it’s simply unavailable in a lot of the world.
Halo is a different route to the same model. Independent operators serve GPT-5 alongside 140+ other models, and you reach them directly.
No subscription — pay per prompt
You don’t buy a monthly plan. You top up once with card or crypto and pay per prompt in USDC on Base, for the actual tokens you use. For occasional or bursty use that’s usually far cheaper than a plan you barely touch — and there’s nothing to cancel.
No account, no API key
There’s no OpenAI signup and no API key to manage. Sign in with a social account and send a prompt. Your prompts aren’t tied to a personal account with a provider, and there’s no card on file.
Verifiable, not just trusted
The awkward question with any inference marketplace is whether the operator really ran the model you paid for. Halo answers it with Statistical Proof of Execution — a fingerprint on every result that the network checks. You don’t have to take an operator’s word for it.
For anything sensitive, confidential mode encrypts your prompt directly to a hardware enclave (a TEE) that even the serving operator can’t read.
Compare it against the alternatives
Because every model sits behind the same sign-in, you can send one prompt to several and judge for yourself. Worth trying next to GPT-5: Claude, Gemini and DeepSeek — the last of which often matches it on reasoning for a fraction of the price.
New to it? Start with how to use Halo on the web.
Frequently asked questions
Can I use GPT-5 without ChatGPT Plus?
Yes. Independent operators on Halo serve GPT-5, and you reach them directly — no OpenAI account, no Plus subscription. You pay per prompt in USDC on Base, so a light month costs a fraction of a fixed monthly plan.
Is this the real GPT-5 or a copy?
The real model. Every result on Halo carries a statistical proof of execution: running the genuine model produces roughly 90%+ token-distribution overlap with the verifier, while fabricated output looks like random noise. Results below the network's acceptance threshold are rejected.
Do I need an OpenAI API key?
No. There are no provider API keys on Halo and no per-provider signup. You sign in with a social account, top up with card or crypto, and send prompts.
What if ChatGPT isn't available where I am?
Halo is permissionless, so there's no region check and no single company deciding who gets served. If one operator can't reach you, another can. See the access notes for China, Hong Kong and Russia.