# Formation Generative Engine Optimization (GEO) review (2026): price, rating, what it teaches

> Formation Generative Engine Optimization (GEO): composite 39.6 of 100, $964 (EUR 840) one-off, 4 of 13 curriculum flags confirmed. Checked September 2026.

URL: https://aiseocourse.directory/courses/sorbonne-celsa-generative-engine-optimization/

Formation Generative Engine Optimization (GEO) review: a live cohort program on Vendor academy from CELSA / Sorbonne Université, taught by Christophe Lachnitt, ranked 6 of 6 French programs with a composite of 39.6 at low confidence, evidence tier D (checked 18 September 2026).

Price $964 (EUR 840) one-off (checked 18 Sep 2026). Rating: No public rating (checked 18 Sep 2026). No member or enrolment count is published (checked 18 Sep 2026). Curriculum: 4 of 13 tracked flags confirmed, 1 confirmed absent, 8 unverified.

## Verdict

By Editorial team. Opinion within the published method; every figure is from the record below.

Formation Generative Engine Optimization (GEO) from CELSA, Sorbonne Universite has no course-level rating on any platform the directory checks, so it sits at evidence tier D and is listed without a rank. The brochure does publish a price and names Christophe Lachnitt, but skips refund terms, class size, certificate details and a session date. What you get is a French-language, in-person day on the Jussieu campus covering AI search fundamentals through to performance measurement. That fits a French communications or marketing team whose employer pays the third-party rate of $964.40. Buyers who want dated reviews, recordings or follow-up support should look at a different program.

### Who it fits

-   French-speaking marketers who want a single in-person day in Paris
-   Communications teams sent by an employer paying the third-party rate
-   In-house teams starting GEO from a standing start

### Who should skip it

-   Buyers who need public reviews before paying
-   Non-French speakers, since the day is taught in French
-   Anyone wanting recordings, a community or follow-up coaching

## Score breakdown

Composite 39.6 of 100, rubric v1, evidence tier D, low confidence (31 of 67 attributes confirmed, checked 18 Sep 2026). The score measures public evidence about a program (what is published, what learners say, how current it is), not teaching quality.

[AI SEO course scoring methodology](/methodology/): weights, evidence ladder, confidence rule and what was checked and not found for every program. Every price in context: [AI SEO course cost](/ai-seo-course-cost/).

| Dimension | Weight | Score | Points | Evidence |
| --- | --- | --- | --- | --- |
| Satisfaction | 0%base 22% | n/a | 0.0 | No course-level rating found (checked 2026-09-18); platforms checked: official-site, educatly, trustpilot, g2, reddit-rating, youtube |
| Volume | 22%base 13% | 0 | 0.0 | . Caps: undefined reviews, members. |
| Recency | 26%base 15% | 84 | 21.7 | Latest dated evidence: last dated content update on 22 Jul 2026, 1.9 months before the cutoff of 18 Sep 2026; 3 dated events on record. |
| Sentiment | 0%base 20% | n/a | 0.0 | No independent public discussion or attributed review found (checked 2026-09-18) |
| Transparency | 34%base 20% | 29 | 9.9 | 2 of 7 checks met (checked 18 Sep 2026); not met: refund policy published, curriculum published (most topic flags resolvable), module or lesson count published, member or enrolment count published, testimonials or reviews carry dates. |
| Completeness | 17%base 10% | 46 | 8.0 | 31 of 67 tracked attributes confirmed (checked 18 Sep 2026). |

Weight redistribution (evidence ladder): satisfaction (22%) to volume, recency, transparency, completeness; sentiment (20%) to volume, recency, transparency, completeness.

## Facts

Each value carries its data label (provider-stated, observed, calculated), the date it was checked and its source. Unverified means the value could not be confirmed on a public page by the check date.

| Attribute | Value | Label | Checked | Source |
| --- | --- | --- | --- | --- |
| Provider | CELSA / Sorbonne Université | provider-stated | 18 Sep 2026 | [1] |
| Instructor | Christophe Lachnitt | provider-stated | 18 Sep 2026 | [2] |
| Platform | Vendor academy | observed | 18 Sep 2026 | [1] |
| Format | Live cohort: One-day, in-person continuing-education stage with methodological contributions and practical workshops | observed | 18 Sep 2026 | [3] |
| Level | Unverified | unverified | 18 Sep 2026 |  |
| Language | French | observed | 18 Sep 2026 |  |
| Status | Live | observed | 18 Sep 2026 | [1] |
| Price | $964 (EUR 840) one-offUSD converted at the ECB reference rate of 17 Sep 2026 | provider-stated | 18 Sep 2026 | [3] |
| Price note | €840 net for third-party payers; €588 net for individuals | provider-stated | 18 Sep 2026 | [3] |
| Annual price | Unverified | unverified | 18 Sep 2026 | [3] |
| Normalised monthly cost | $80 (one-off price amortised over 12 months) | calculated | 18 Sep 2026 |  |
| Pricing mechanism | One-off training price with separate third-party and individual rates | provider-stated | 18 Sep 2026 | [3] |
| Instalments | Unverified | unverified | 18 Sep 2026 |  |
| Regional pricing | Unverified | unverified | 18 Sep 2026 |  |
| Team pricing | Unverified | unverified | 18 Sep 2026 |  |
| Refund policy | Unverified | unverified |  |  |
| Course rating | UnverifiedPlatforms checked with no course-level rating: official site, educatly, Trustpilot, G2, Reddit, YouTube | unverified | 18 Sep 2026 |  |
| Members or enrolled | Unverified | unverified | 18 Sep 2026 |  |
| Launched | 18 May 2026 | provider-stated | 18 Sep 2026 | [1] |
| Last dated content update seen | 22 July 2026 | observed | 18 Sep 2026 | [3] |
| Next cohort | Unverified | unverified | 18 Sep 2026 |  |
| Access model | UnverifiedWindow: start unverified to end unverified | unverified | 18 Sep 2026 | [3] |
| Update model | Unverified | unverified | 18 Sep 2026 |  |
| Module count | Unverified | unverified | 18 Sep 2026 |  |
| Lesson count | Unverified | unverified | 18 Sep 2026 |  |
| Hours of video | Unverified | unverified | 18 Sep 2026 |  |
| Time to complete | 7 | provider-stated | 18 Sep 2026 | [3] |
| Live call frequency | One-off (one-day in-person training) | provider-stated | 18 Sep 2026 | [3] |
| Live call day | Unverified | unverified | 18 Sep 2026 |  |
| Live call timezone | Unverified | unverified | 18 Sep 2026 |  |
| Support channel | Unverified | unverified | 18 Sep 2026 |  |
| Instructor access | Unverified | unverified | 18 Sep 2026 |  |
| Practical work | Assignments | provider-stated | 18 Sep 2026 | [3] |
| Certificate | Unverified | unverified |  |  |
| Community included | Unverified | unverified | 18 Sep 2026 | [3] |
| Tools bundled | Unverified | unverified | 18 Sep 2026 |  |
| Tools taught | Unverified | unverified | 18 Sep 2026 |  |
| AI platforms named | Other | provider-stated | 18 Sep 2026 | [3] |
| Audience (provider-stated) | Unverified | unverified | 18 Sep 2026 |  |
| Provider ranks itself in a roundup | Unverified | unverified |  |  |
| Affiliate program | Unverified | unverified | 18 Sep 2026 |  |
| Public case studies | Unverified | unverified | 18 Sep 2026 |  |

## Formation Generative Engine Optimization (GEO) price and price history

Current price $964 (EUR 840) one-off (checked 18 September 2026). One dated observation on record, so no trend is shown. €840 net for third-party payers; €588 net for individuals.

| Date | Amount | Model | Members at the time | Note | Seen | Source |
| --- | --- | --- | --- | --- | --- | --- |
| 18 Sep 2026 | EUR 840 | One-off | unverified | Current brochure price; no verified Wayback snapshot was accessible | 18 Sep 2026 | [3] |

### Formation Generative Engine Optimization (GEO) refund policy

No refund policy was found on a public page ().

## What Formation Generative Engine Optimization (GEO) teaches

4 of 13 tracked curriculum flags are confirmed on public pages, 1 confirmed absent and 8 unverified (checked 18 September 2026). A confirmed flag means the provider's own curriculum or listing names the topic; the source is cited, the wording is not reproduced.

| Flag | Status | Label | Checked | Source |
| --- | --- | --- | --- | --- |
| GEO | Yes | provider-stated | 18 Sep 2026 | [3] |
| AEO | Unverified | unverified | 18 Sep 2026 |  |
| LLM citations | Yes | provider-stated | 18 Sep 2026 | [1] |
| Entity SEO | Unverified | unverified | 18 Sep 2026 |  |
| AI visibility measurement | Yes | provider-stated | 18 Sep 2026 | [3] |
| Traditional SEO | Yes | provider-stated | 18 Sep 2026 | [3] |
| Links and off-page | Unverified | unverified | 18 Sep 2026 |  |
| Local AI SEO | No | observed | 18 Sep 2026 | [3] |
| Structured data | Unverified | unverified | 18 Sep 2026 |  |
| AI crawler access | Unverified | unverified | 18 Sep 2026 |  |
| Content for extraction | Unverified | unverified | 18 Sep 2026 |  |
| Brand mentions and PR | Unverified | unverified | 18 Sep 2026 |  |
| AI workflows and automation | Unverified | unverified | 18 Sep 2026 |  |

## Reception

### Ratings by platform

No course-level rating was found (checked 18 September 2026). Platforms checked: official site, educatly, Trustpilot, G2, Reddit, YouTube. A missing rating is never scored as zero; see the score breakdown for how the weight moved.

### What public discussion says

No independent public discussion or attributed review found (checked 2026-09-18)

## Cautions

Sourced facts from the caution checks (price consistency, page history, instructor identity, testimonial dating, self-ranking, certificate claims). Neutral by design: each line is what a public page shows, with its date.

1.  The seller publishes €840 net for third-party payers and €588 net for individuals. Check 1, seen 18 Sep 2026 [\[3\]](#src-3)
    
2.  The May announcement says 2 days; the current brochure at https://fc.sorbonne-universite.fr/pdf/fiche/?ID=105102 says 7 hours and the current third-party listing at https://www.educatly.com/program/812561/generative-engine-optimization-geo says 1 day. Check 2, seen 18 Sep 2026 [\[1\]](#src-1)
    
3.  Christophe Lachnitt is named on the public program listing at https://www.educatly.com/program/812561/generative-engine-optimization-geo and has a public Sorbonne teacher profile. Check 3, seen 18 Sep 2026 [\[2\]](#src-2)
    
4.  The current brochure says dates are to be seen in the calendar; no session date is visible in the brochure. Check 4, seen 18 Sep 2026 [\[3\]](#src-3)
    
5.  No testimonials are visible in the official announcement or the two-page brochure at https://fc.sorbonne-universite.fr/pdf/fiche/?ID=105102. Check 5, seen 18 Sep 2026 [\[1\]](#src-1)
    
6.  The current brochure does not name a certificate or an accrediting body. Check 7, seen 18 Sep 2026 [\[3\]](#src-3)

## Compared with

### Formation Generative Engine Optimization (GEO) alternatives

Programs in the same format band that cost less, in composite order (checked 18 Sep 2026):

-   [Formation GEO: SEO pour l'IA](/courses/lafusee-formation-geo/): $279 (CAD 390) one-off, composite 56.1, low confidence (18 Sep 2026)

## Formation Generative Engine Optimization (GEO) review: questions

How much does Formation Generative Engine Optimization (GEO) cost?

The brochure publishes two one-off net rates in euros: a higher one for third-party payers and a lower one for individuals paying themselves. Converted, the third-party rate is $964.40. Price checked 18 September 2026, with no movement recorded since.

Does the course have a refund policy?

The provider does not publish refund terms in the brochure or the official announcement; checked 18 September 2026. If you are paying as an individual rather than through an employer, ask for the cancellation terms in writing before you book a seat.

Who teaches it?

Christophe Lachnitt, of Croisens, is named on the public program listing and has a Sorbonne teacher profile. The record shows prior products to his name but no published AI search tests. Instructor details checked 18 September 2026.

How long is the course and when does it run?

The current brochure gives 7 hours on the Jussieu campus, delivered as one in-person day. The announcement from May 2026 described a longer format, and a third-party listing says one day. No session date is visible in the brochure.

What does it cover?

AI search and GEO fundamentals, strategic questions, content production and activation, then performance management, alternating teaching with workshops. LLM citations, AI visibility measurement and traditional SEO are confirmed. Local AI SEO is not covered, and eight of the curriculum flags stay unverified.

## Sources

1.  [https://fc.sorbonne-universite.fr/actualite/nouvelle-formation-generative-engine-optimization-geo/](https://fc.sorbonne-universite.fr/actualite/nouvelle-formation-generative-engine-optimization-geo/)
    
2.  [https://fc.sorbonne-universite.fr/corps\_enseignant/christophe-lachnitt/](https://fc.sorbonne-universite.fr/corps_enseignant/christophe-lachnitt/)
    
3.  [https://fc.sorbonne-universite.fr/pdf/fiche/?ID=105102](https://fc.sorbonne-universite.fr/pdf/fiche/?ID=105102)

Record last checked on 18 September 2026. Observation cutoff for the dataset: 18 September 2026. Source file: 50-sorbonne-celsa-generative-engine-optimization.md.

Cite this

Formation Generative Engine Optimization (GEO): composite 39.6 of 100 (low confidence), $964 (EUR 840) one-off, No public rating. AiSeoCourse Directory, 18 September 2026. https://aiseocourse.directory/courses/sorbonne-celsa-generative-engine-optimization/ (CC BY 4.0).

HTML with the attribution link <p>Formation Generative Engine Optimization (GEO): composite 39.6 of 100 (low confidence), $964 (EUR 840) one-off, No public rating. <a href="https://aiseocourse.directory/courses/sorbonne-celsa-generative-engine-optimization/">AiSeoCourse Directory</a>, 18 September 2026. Data: CC BY 4.0.</p>