Open Calais Blog is Live! 3 Simple Use Cases to Help Power Your Business, Thomson Reuters’ first open data offering, went live on April 21, 2015. As the portal to Thomson Reuters’ information model, offers your business the opportunity to enhance and enrich your data by giving you a unique identifier for individual data objects called the permanent identifier or “PermID”. There are three ways to extract […]

PHP Code Library for Open Calais!

Very special thanks to Open Calais user Dan Grossman for updating his PHP code library to play with the new Open Calais API! The library can be found here: Please let us know if you have any questions. Thanks!

Open Calais Error Messages

We have received a lot of queries from users about error messages. This blog post attempts to provide some basic recommendations. Open Calais returns messages when it cannot process or complete a transaction due to format or load issues. Such requests are returned in the body of the HTTP response with an HTTP error code. […]

Open Calais Relevance Scores

Continuous relevance scores, which were supported by legacy Open Calais have been slightly modified; in the new Open Calais, relevance scores are expressed as discrete values (except for the company entity which is given both discrete and continuous relevance scores). All extracted entities have an associated RelevanceInfo tag that indicates how centric the entity is […]

Open Calais Provides Direct Links to Open PermID

The new openpermid attribute of the Company and TopmostPublicParentCompany disambiguation types (er/company and er/TopmostPublichParentCompany tags) gives you direct access to high quality, curated Thomson Reuters company data. The attribute value is a direct link to the relevant company page on the Open PermID website ( An example of the openpermid attribute in the Open Calais […]

Updated User and Upgrade Guides

Thank you all for your upgrade to the new Open Calais and thank you for helping us make the product even better for you. We want you to know that we take your feedback seriously and have fixed errors in our user guides that you have brought to our attention. The updated user guides are […]

Links to Company Data – Legacy ID

The old links to company data that were included in the legacy Open Calais output are no longer supported. For the convenience of legacy Open Calais users, a new attribute, legacyid, has been temporarily added to the er/company and er/TopmostPublicParentCompany disambiguation tags. The purpose of the legacyid attribute is to enable you to map the […]

Upgrade to the New Open Calais

Thanks to those of who have made the upgrade to the new Open Calais. We hope that you are experiencing the many advantages of doing so. For those users who have not yet made the upgrade, we urge you to do so at your earliest convenience, as the legacy system you are currently using will […]

Gnosis Shutdown

On Monday, May 18, 2015 we will shut down our Gnosis browser plugin service. Please make the necessary changes to your workflows. We apologize for any inconvenience. If you have any questions, please email us at Thank you.

Invoking Open Calais – code sample

For your convenience, we are now offering a sample code in Java via the Developer portal. Please click here to access the code sample. If you have any questions, please email us at