PowerPoint Presentation Maker by SlidesGPT

PowerPoint Presentation Maker by SlidesGPT was the name of a third-party custom GPT that generated slide decks from a conversation in ChatGPT. It was created before the public launch of the GPT Store and was listed when the store opened in January 2024. The GPT sent structured content to SlidesGPT, which rendered a deck and provided a browser preview or export.^[1][2]

The name now describes a legacy entry point rather than the whole product. SlidesGPT continues as a web service and the company promotes a newer SlidesGPT app for ChatGPT. On July 28, 2026, the old GPT URL for identifier g-cJtHaGnyo returned HTTP 404 to a signed-out request, while SlidesGPT's current app page and ChatGPT app listing were still available. The company nevertheless continued to say that its service was available through both the GPT Store and the ChatGPT App Store. Availability should therefore be checked in the user's account and workspace rather than inferred from the old listing.^[3][4][5]

Scroll sideways for more →

Product history

SlidesGPT says the underlying service was founded in 2023. Its co-founder later described the first version as a prompt field that asked an OpenAI model for a presentation outline and slide text, then converted the returned Markdown into Google Slides. That account is a first-party retrospective, not an independently audited product history.^[7][18]

An independent 2025 study of 14,904 custom GPTs recorded g-cJtHaGnyo as created on November 9, 2023. The GPT therefore existed before the GPT Store opened on January 10, 2024 and could initially be shared by link. SlidesGPT's co-founder said it became a "Day-0" store listing when the store opened. The study's updated dataset recorded 2 million conversations, an average rating of 3.9, and 5,000 reviews for the identifier. Those figures are a historical research snapshot, not current usage totals.^[2][6][8]

SlidesGPT currently reports more than 10 million presentations generated across its services. This is a company-reported cumulative figure and is not the same as conversations with the legacy GPT, unique users, paid subscribers, or completed downloads.^[7]

The current website imprint names Lightstone GmbH as the service operator and gives commercial-register number HRB 118934 at the Cologne district court. A German registry aggregator records the company's registration on May 3, 2024, after the product's stated 2023 launch. Microsoft also lists Lightstone GmbH as the publisher of the SlidesGPT product in its marketplace. These records support the present operator identity but do not establish that the GmbH existed when the first web prototype was released.^[9][10][11]

Legacy GPT and current ChatGPT app

The original listing was a configured GPT that combined ChatGPT instructions with an external action. Descriptions of it often labeled the underlying model GPT-4, but that should not be treated as a current specification. OpenAI says GPT models may be updated or retired and that affected GPTs can be switched automatically to a similar current model. OpenAI also says GPTs can use either actions or apps, but not both at the same time.^[12]

SlidesGPT now directs users to a separate ChatGPT app. Its product page describes conversational refinement, an in-chat slide preview, a carousel, a theme picker, image search, and PowerPoint or PDF download. The broader SlidesGPT feature page also advertises Google Slides export, browser editing, speaker notes, custom branding, uploaded PowerPoint masters, and input from text, PDF, YouTube, and Markdown. Some of those broader web-platform features may not be exposed in every ChatGPT interaction or subscription tier.^[1][3]

The former article treated the legacy GPT's internal instructions as a permanent product specification. That was not reliable. A system prompt can change without notice, leaked text may be incomplete or altered, and an internal instruction does not prove that the service performed the described action. The full prompt dump has therefore been removed. It is more useful to document observable behavior and current public policies than to reproduce prompt engineering material that the publisher did not release as documentation.

Older sources also called external GPT connections plugins. OpenAI's current terminology distinguishes actions, which call developer-defined APIs, from apps, which connect through user-approved tools. The distinction matters because it affects permissions, data flow, and what a user is asked to approve.^[12]

Generation and editing workflow

Across the current web and ChatGPT surfaces, the documented workflow is:

1. The user supplies a topic, source text, or supported file or link.
2. The service creates an outline and draft slide content using generative AI.
3. SlidesGPT applies layouts and images and creates a browser preview.
4. The user can revise the outline, text, order, images, layouts, notes, or theme where the selected surface supports those controls.
5. A paid entitlement may be required to export or download the result.^[1][3][13]

SlidesGPT's feature page describes slide text, speaker notes, stock-image search, AI-generated images, multiple layouts, and branded templates. It does not support the old article's claim that every image comes exclusively from Unsplash. Nor does the public documentation guarantee that every requested chart is a validated data visualization. Generated charts, citations, calculations, and speaker notes still require human review.

A 2024 help article documented a legacy ChatGPT failure mode in which only two or three slides were produced and told users to ask the GPT to create the remaining slides. That is evidence of a past support issue, not proof of a permanent three-slide limit or the behavior of the current app.^[14]

Access and pricing

There are two separate access layers. OpenAI says all signed-in ChatGPT users, including Free users, can use GPTs they are allowed to access. Free accounts have lower rate limits, and managed-workspace administrators can restrict GPT or app access. Creating or editing a GPT requires a paid ChatGPT plan, but using a public GPT does not by itself require Plus, Pro, Business, or Enterprise. This corrects the former article's claim that a paid ChatGPT plan was always required.^[12]

SlidesGPT applies its own product and export limits. Its live pricing page displayed the annual Pro and Pro XL prices, their effective monthly equivalents, and the other plan figures below on July 28, 2026. The $9.99 and $29.99 month-to-month figures come instead from a cited 2026 founder retrospective.^[6][13] Prices, taxes, currencies, regional availability, and limits can change.

Scroll sideways for more →

The pricing page also advertises a REST API with up to 100 presentations per month at no charge and usage-based pricing above that threshold. However, a 2026 founder update said that the public API was being sunset. The two first-party statements conflict, so developers should confirm the API's current onboarding and end-of-service schedule before integrating it.^[13][15]

SlidesGPT's terms say paid subscriptions renew automatically until canceled, cancellation takes effect at the end of the current billing period, and payments are non-refundable. Those contractual terms are more relevant to a purchase decision than the former page's unsupported comparison with competitors.^[16]

Privacy and data flow

The legacy GPT and current app involve more than ChatGPT alone. OpenAI says that when a GPT uses an external API or app, relevant parts of a user's input may be sent to the third party. The GPT builder cannot read individual ChatGPT conversations through the normal GPT interface, but the external service can receive data needed for its tool call. OpenAI says it does not audit or control how that service uses or stores the transferred data.^[12]

SlidesGPT's privacy policy says it may collect account, login, purchase, device, IP-address, location, clickstream, cookie, and interaction information. It says the company does not sell users' personal information. The policy also states that conversation and personal data may be stored for up to six years unless the account is deleted, after which it says the data will not be retained for more than 60 days.^[17]

The policy leaves important questions unresolved. It does not provide a dated revision notice on the page, name a complete subprocessor list, or clearly explain whether prompts and generated decks are used to train models. It also identifies the responsible country and governing law as the United States, while the imprint identifies a German operator and the terms say the service is operated from Germany. Users handling confidential, regulated, personal, or client-owned material should obtain the applicable data-processing terms instead of assuming that a consumer privacy page or an on-premises marketing claim meets their requirements.^[9][17]

OpenAI's own training rules remain a separate issue. It says consumer-plan conversations may be used to improve its models depending on the user's data-control choice, while Business, Enterprise, and Edu data is not used for training by default. Sending material to SlidesGPT can add a second retention and processing path even when OpenAI training is disabled.^[12]

Terms and output responsibility

SlidesGPT's terms define user material as "Inputs" and AI-generated material as "Results." They say results are provided as is, may not be unique, and carry no guarantee of accuracy, completeness, or reliability. Users are made responsible for their inputs and use of the results. The terms also prohibit infringement, harmful or illegal material, regulated professional advice, and some automated or high-volume uses.^[16]

As of July 28, 2026, the terms did not clearly grant the user ownership of generated Results. A separate submissions clause says that ideas, designs, photographs, information, data, and proposals submitted or posted through the service become non-confidential property of SlidesGPT, but it does not clearly state whether that clause covers ordinary generation prompts or uploaded source documents. Organizations that need defined ownership, confidentiality, or reuse rights should resolve that ambiguity contractually before uploading proprietary material.^[16]

The terms require users to check the truthfulness of their content, while SlidesGPT disclaims accuracy. A generated deck is therefore best treated as a first draft. Factual claims, citations, calculations, image licenses, accessibility, brand compliance, and file formatting should be checked before a presentation is delivered or published.

Evidence and comparisons

The 2025 security study provides unusually strong independent evidence that this exact GPT identifier existed, its creation timestamp, and its historical engagement metrics. It also found widespread system-prompt leakage and jailbreak susceptibility across the custom-GPT ecosystem. The paper does not publish a per-GPT vulnerability result for g-cJtHaGnyo, so it cannot be used to claim that SlidesGPT itself passed or failed any specific security test.^[2]

Most current claims about SlidesGPT's speed, deck quality, customer organizations, and cumulative usage come from SlidesGPT. No controlled, independent benchmark was located that compares its current output quality with Gamma AI, Tome, Beautiful.ai, Canva, PopAi, or SlidesAI. Those products are relevant alternatives in AI-assisted writing and productivity, but their workflows, export fidelity, privacy terms, and pricing change frequently. The former article's rankings and superiority claims have therefore been removed.

References

1. ^SlidesGPT, "Features of our AI PowerPoint Generator," accessed July 28, 2026. slidesgpt.com/features
2. ^S. O. Ogundoyin et al., "Unsafe by Design? A First Look at Security and Privacy Risks in OpenAI's Custom GPT Ecosystem," WPES 2025. imikr4m.github.io/...ynamics_of_Custom_GPTs_mq.pdf
3. ^SlidesGPT, "SlidesGPT on ChatGPT Apps," accessed July 28, 2026. slidesgpt.com/...slidesgpt-chatgpt-app
4. ^OpenAI, "SlidesGPT" ChatGPT app listing, accessed July 28, 2026. chatgpt.com/...pp_695bd06f20d88191b873f501a7dd6620
5. ^OpenAI, legacy GPT URL for `g-cJtHaGnyo`, returned HTTP 404 to a signed-out request on July 28, 2026. chatgpt.com/...int-presentation-maker-by-slidesgpt
6. ^Benjamin Spinola, "The SlidesGPT Story, Part 5," company founder account of the GPT Store history and monthly pricing, 2026. linkedin.com/...-activity-7467266828428488704-Lc-0
7. ^SlidesGPT, "About SlidesGPT," accessed July 28, 2026. slidesgpt.com/about
8. ^OpenAI, "Introducing the GPT Store," January 10, 2024. openai.com/...introducing-the-gpt-store
9. ^SlidesGPT, "Imprint," accessed July 28, 2026. slidesgpt.com/imprint
10. ^CompanyHouse, "Lightstone GmbH, Cologne," registry-data profile, accessed July 28, 2026. companyhouse.de/Lightstone-GmbH-Koeln
11. ^Microsoft Marketplace, "SlidesGPT by Lightstone GmbH," accessed July 28, 2026. marketplace.microsoft.com/...WA200008430
12. ^OpenAI Help Center, "GPTs in ChatGPT," updated July 2026. help.openai.com/...8554407-gpts-in-chatgpt
13. ^SlidesGPT, "Pricing," accessed July 28, 2026. slidesgpt.com/pricing
14. ^SlidesGPT Help Center, "My PPT has only 2 or 3 slides!," edited September 19, 2024. slidesgpt.frontkb.com/...2284610
15. ^Benjamin Spinola, "The SlidesGPT Story, Part 6," company founder statement that the public API was being sunset, 2026. linkedin.com/...-activity-7472590671699218432-BAtO
16. ^SlidesGPT, "Terms of Service," accessed July 28, 2026. slidesgpt.com/tos
17. ^SlidesGPT, "Privacy Policy," accessed July 28, 2026. slidesgpt.com/privacy
18. ^Benjamin Spinola, "The SlidesGPT Story, Part 2," company founder account of the original prototype, 2025. linkedin.com/...-activity-7364264220168744960-frYn