EXHIBIT 31.1

I, James E. Rottsolk, certify that:

1.       I have reviewed this quarterly report on Form 10-Q of Cray Inc.;

2.       Based on my knowledge, this report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances under which
         such statements were made, not misleading with respect to the period
         covered by this report;

3.       Based on my knowledge, the financial statements, and other financial
         information included in this report, fairly present in all material
         respects the financial condition, results of operations and cash flows
         of Cray as of, and for, the periods presented in this report;

4.       Cray's other certifying officer and I are responsible for establishing
         and maintaining disclosure controls and procedures (as defined in
         Exchange Act Rules 13a-15(e) and 15d-15(e)) for Cray and have:

                           (a) Designed such disclosure controls and procedures,
                           or caused such disclosure controls and procedures to
                           be designed under our supervision, to ensure that
                           material information relating to Cray, including its
                           consolidated subsidiaries, is made known to us by
                           others within those entities, particularly during the
                           period in which this report is being prepared;

                           (b) Evaluated the effectiveness of Cray's disclosure
                           controls and procedures and presented in this report
                           our conclusions about the effectiveness of the
                           disclosure controls and procedures, as of the end of
                           the period covered by this report based on such
                           evaluation; and

                           (c) Disclosed in this report any change in Cray's
                           internal control over financial reporting that
                           occurred during Cray's most recent fiscal quarter
                           (Cray's fourth fiscal quarter in the case of an
                           annual report) that has materially affected, or is
                           reasonably likely to materially affect, Cray's
                           internal control over financial reporting; and

5.       Cray's other certifying officer and I have disclosed, based on our most
         recent evaluation of internal control over financial reporting, to
         Cray's auditors and the audit committee of Cray's board of directors
         (or persons performing the equivalent functions):

                           (a) All significant deficiencies and material
                           weaknesses in the design or operation of internal
                           control over financial reporting which are reasonably
                           likely to adversely affect Cray's ability to record,
                           process, summarize and report financial information;
                           and

                           (b) Any fraud, whether or not material, that involves
                           management or other employees who have a significant
                           role in Cray's internal control over financial
                           reporting.

November 14, 2003
                                         /s/ James E. Rottsolk

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                                         James E. Rottsolk
                                         President and Chief Executive Officer