Free GPT API access: what is actually free.

Quick answer: four routes, four catches.

One route people remember no longer exists: the automatic trial credit that new OpenAI accounts once received. 2026 guides describe it as discontinued or unreliable, and the dependable statement is that a fresh account should expect to prepay before its first billed request. That is the backdrop against which the four real routes above make sense.

• ChatGPT's free tier: genuinely free chat with current models. The catch: it is a consumer product, no API key comes with it, and a ChatGPT subscription does not add API credits either.
• OpenAI's complimentary data-sharing tokens: opt in to share your API prompts and outputs for training, and eligible accounts receive free daily token allowances on listed models. The catch: your traffic trains their models, eligibility conditions apply, and OpenAI reserves the right to end the program on notice.
• The gpt-oss open weights: OpenAI published open-weight gpt-oss models in 2025 that you can self-host without per-token fees. The catch: they are not the hosted GPT-5.x line, and serving them well takes real hardware.
• APIsRouter's free starting credit: issued without a card, spendable on gpt-5.4-mini, gpt-5.4, gpt-5.5, and the gpt-5.6 family at the same catalog rates as paid traffic. The catch is the honest one: a starting credit, not an unlimited tier; pay-as-you-go after.

What OpenAI offers, and what only looks like an offer.

The developer platform is prepaid pay-as-you-go: create an account, buy credits, generate a key, and requests bill per token at list rates. The playground meters the same billing, so it is a paid surface too, just an interactive one. The one genuine free mechanism is the complimentary daily tokens program. Accounts that opt in to sharing their API data for model training receive free daily token allowances on an eligible-model list, reported in 2026 at up to a million tokens per day on flagship-class models and a larger allowance on mini-class models. Three conditions temper it: the eligible model lists and amounts have changed over time, community threads describe accounts that do not see the offer at all (eligibility has commonly required prior paid usage), and the data-sharing itself makes it a non-starter for anything sensitive. OpenAI has said it gives notice before ending the program, which tells you it is a program, not a tier. Check the data-controls section of the platform settings for what your account is offered today. Beyond that: startup and ecosystem credit programs exist by application, and launch promotions come and go. None of it is a sign-up-and-go free API, which is exactly why this search stays popular.

What the free starting credit here actually is.

The route on this site is deliberately simple: a free starting credit, no card required, spendable on any catalog id, including the GPT family from gpt-5.4-mini up through the gpt-5.6 variants. There is no degraded free endpoint and no separate free-model list; the credit meters the same models at the same catalog rates as paid traffic, and nothing you send is shared for training as the price of the tokens. When the credit runs out, access continues as pay-as-you-go top-ups with no subscription, and an idle month costs nothing. To be precise about what this is not: it is not unlimited free GPT. Nobody serves a frontier model without metering it somewhere. What the credit buys is a real evaluation: current models, real rate behavior, and exact per-request token counts in the usage log, before any money moves. The practical pattern: start on gpt-5.4-mini, which carries most prototype workloads at the family's lowest rates, and step up to gpt-5.4 or gpt-5.5 only where the mini model measurably falls short. The same key also runs Claude, DeepSeek, and Gemini ids, so the comparison that decides your steady state is an afternoon of identical requests.

curl https://api.apisrouter.com/v1/chat/completions \
  -H "Authorization: Bearer $APISROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4-mini",
    "messages": [{"role": "user", "content": "Write a one-paragraph changelog entry for a bugfix release."}]
  }'

ChatGPT free vs the API: the confusion that will not die.

ChatGPT's free tier is real and generous: chat with current models, no payment, daily limits on the heavier features. It is also the wrong answer to every search that ends in "API", because no key comes with it, no automation can sit on top of it, and scraping the chat UI violates the terms it runs under. Paying for ChatGPT changes none of this: consumer subscriptions and API billing are unrelated meters, in both directions. The test is one question: does the route hand you an sk-style key that answers at an HTTPS endpoint? ChatGPT does not, at any plan level. The routes that do are OpenAI's prepaid platform, the data-sharing token program on top of it, and gateway credits like the one here. Each meters usage, because serving frontier models costs someone money per token. The gpt-oss weights are the one escape from metering entirely: openly licensed models you can run on your own hardware with no per-token bill. They sit a tier below the hosted line in capability and a tier above it in operational effort, which makes them a genuine answer for teams with GPUs and a non-answer for everyone else.

Pay-as-you-go · transparent per-model pricing

Selected models are priced below official list prices. Exact input, output, cache, and per-request prices are shown for each model.

When free stops being the right answer.

Free GPT routes fail in characteristic ways: a daily token allowance resets mid-workday, the data-sharing terms rule out the workload that actually matters, the ChatGPT tier caps the conversation your script cannot have anyway. The signal to move is the first time a limit costs more time than the metered price would have cost money. The mini end of the GPT family makes that a low bar. At catalog rates, gpt-5.4-mini prices a typical chat turn at a small fraction of a cent, so workloads that outgrow free tend to land at single-digit dollars per month rather than subscription-tier bills. The pricing table above has the exact per-million figures next to each id. Because the starting credit and paid traffic share one endpoint and one key, outgrowing free involves no migration: the same base URL, the same model strings, and a balance that tops up instead of an allowance that resets.

Which free route fits which situation.

• Trying GPT conversationally: ChatGPT's free tier. Free, capped, no API.
• High-volume non-sensitive experimentation on OpenAI's own platform: the data-sharing daily tokens, if your account is offered them and the training terms genuinely do not bother you.
• Private or bulk workloads with hardware to spare: self-hosted gpt-oss weights, with no per-token bill and full data control.
• Evaluating the hosted GPT family for real work, without a card: the starting credit here, because it runs the exact ids you would ship with, next to every model you might compare them against.
• Production traffic of any size: metered pay-as-you-go, on OpenAI's platform or a gateway. No free mechanism anywhere is built to carry production.

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