Gensym Announces Immediate Availability of G2 7.1; Latest Release of Company's Flagship Expert System Software Simplifies Integration with Enterprise Systems.

Business Editors/High-Tech Writers

BURLINGTON, Mass.--(BUSINESS WIRE)--Dec. 1, 2003

Gensym Corporation (OTC Bulletin Board: GNSM), a leading provider of software and services for expert operations management, today announced the immediate availability of version 7.1 of its flagship G2(R) real-time expert system software. Version 7.1 introduces and advances important pieces of next-generation G2 functionality, including support for integration of G2-based applications with enterprise systems using message oriented middleware (MOM).

"This release adds a readily configurable module for integrating G2 applications with a wide variety of enterprise systems that support MOM," said Philippe Printz, Gensym's vice president of product engineering. "This capability will be especially valuable for many of our users who are fielding G2 applications that bridge the gap between real-time operations, such as on a factory floor, and transaction-based enterprise systems, such as order processing, inventory, and maintenance systems. For example, a G2 application that detects a problem with production equipment can immediately send a work order message to a maintenance system. Or a G2 application that is automating coordination decisions for a manufacturing operation can receive messages from an ERP system that contain the production orders to be fulfilled by the application."

G2 7.1's support of MOM is based on Java Message Service (JMS), which is an industry-standard API for Java. Examples of JMS-compliant MOM systems include IBM WebSphere(R) MQ, SonicMQ(R), Sun JMQ, FioranoMQ(TM), BEA Weblogic(R), and JBossMQ.

"Another important new module is for simplifying integration with email systems," continued Printz. "There are many G2 applications that already send and receive email. A G2 application can, for example, automatically email or page the appropriate individuals needed to address an operational problem that has been identified. With G2 7.1, developers can much more quickly configure their applications to process email messages."

G2 7.1 adds functionality to G2's native Windows UI, which was introduced in Q1 2003 with the release of G2 7.0. It also includes support for integration with a wide variety of existing systems through the use of communication sockets.

Next Generation Software

"G2 7.1 is an important part of Gensym's transition to its next generation of software," said Lowell Hawkinson, Gensym's chairman, president and CEO. "Our next generation is designed to dramatically reduce the time and effort it takes to deploy operational decision-support solutions and to achieve ROI using real-time reasoning technology. We plan to largely complete the transition to our next generation between now and the end of 2004. G2 7.1's new capabilities for integration with MOM, email, and sockets are examples of our next generation product functionality."

About Gensym Corporation

Gensym Corporation (www.gensym.com) is a provider of software products and services that enable organizations to automate aspects of their operations that have historically required the direct attention of human experts. Gensym's product and service offerings are all based on or relate to Gensym's flagship product G2, which can emulate the reasoning of human experts as they assess, diagnose, and respond to unusual operating situations or as they seek to optimize operations.

With G2, organizations in manufacturing, communications, transportation, aerospace, and government maximize the performance and availability of their operations. For example, Fortune 1000 manufacturers such as Alcan, ExxonMobil, DuPont, El Paso, Eli Lilly, Ford, Hitachi, Lafarge, Procter & Gamble, and Toyota use G2 to help operators detect problems early and to provide advice that avoids off- specification production and unexpected shutdowns. Manufacturers and government agencies use G2 to optimize their supply chain and logistics operations, while communications companies such as AT&T, Ericsson, Motorola, and Nokia use G2 to troubleshoot network faults so that network availability and service levels are maximized. Gensym has numerous partners who help meet the specific needs of customers. Gensym and its partners deliver a range of services, including training, software support, application consulting and complete solutions. Through partners and through its direct sales force, Gensym serves customers worldwide.

Gensym and G2 are registered trademarks of Gensym Corporation. All other trademarks are property of their respective owners.

This press release contains forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. Any statements contained in this press release that relate to prospective events or developments are deemed to be forward-looking statements. Words such as "believes," "anticipates," "plans," "expects," "will" and similar expressions are intended to identify forward-looking statements. These forward-looking statements are subject to important risks and uncertainties, which could cause actual results to differ materially from those anticipated. These important risks and uncertainties include the ability of Gensym to deliver our next generation of software, the acceptance of our latest G2 software releases by users, the impact of intense competition, the effectiveness of our indirect distribution channel and strategic partnerships, fluctuations in our customers' demand for our products, and the other risks which we describe under the caption "Factors That May Affect Future Results" in our Quarterly Report on Form 10-Q for the quarter ended September 30, 2003. Although we believe the expectations reflected in the forward- looking statements are based on reasonable assumptions, we can give no assurance that our expectations will be attained. We disclaim any intention or obligation to update any forward- looking statements as a result of developments occurring after the date of this press release.