EXHIBIT 32.1



                 Certificate Pursuant to 18 U.S.C. Section 1350,
      as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002



Pursuant to 18 U.S.C. Section 1350, as adopted to Section 906 of the
Sarbanes-Oxley Act of 2002, the undersigned officers of Cray Inc. (the
"Company") hereby certify, to such officers' knowledge, that:

     (i) the accompanying Annual Report on Form 10-K of the Company for the
     period ended December 31, 2003 (the "Report") fully complies with the
     requirements of Section 13(a) or Section 15(d), as applicable, of the
     Securities Exchange Act of 1934, as amended; and

     (ii) the information contained in the Report fairly presents, in all
     material respects, the financial condition and results of operations of the
     Company.

                                   Dated: March 15, 2004


                                   /s/  JAMES E. ROTTSOLK
                                        James E. Rottsolk
                                        Chief Executive Officer and President


                                   /s/  SCOTT J. POTERACKI
                                        Scott J. Poteracki
                                        Chief Financial and Accounting Officer



          The foregoing certification is being furnished solely to accompany the
          Report pursuant to 18 U.S.C. ss. 1350, and is not being filed for
          purposes of Section 18 of the Securities Exchange Act of 1934, as
          amended, and is not to be incorporated by reference into any filing of
          the Company, whether made before or after the date hereof, regardless
          of any general incorporation language in such filing.