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Exhibit 5.1

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Coherus Oncology, Inc.

333 Twin Dolphin Drive, Suite 600

Redwood City, CA 94065

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Re: Registration Statement No. 333-291520 on Form S-3;

Up to 32,890,000 Shares of Common Stock, par value $0.0001 per share

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To the addressee set forth above:

We have acted as special counsel to Coherus Oncology, Inc., a Delaware corporation (the “Company”), in connection with the proposed issuance of up to 32,890,000 shares of common stock of the Company, $0.0001 par value per share (the “Shares”). The Shares are included in a registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on November 13, 2025 (Registration No. 333-291520) (as so filed and as amended, the “Registration Statement”), a base prospectus dated December 8, 2025 included in the Registration Statement (the “Base Prospectus”), a preliminary prospectus supplement dated February 12, 2026 filed with the Commission pursuant to Rule 424(b) under the Act (together with the Base Prospectus, the “Preliminary Prospectus”), and a prospectus supplement dated February 12, 2026 filed with the Commission pursuant to Rule 424(b) under the Act (together with the Base Prospectus, the “Prospectus”), and an underwriting agreement dated February 12, 2026, among TD Securities (USA) LLC, Guggenheim Securities, LLC, and Oppenheimer & Co. Inc., as representatives of the several underwriters named in the underwriting agreement, and the Company (the “Underwriting Agreement”).

This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or the Prospectus, other than as expressly stated herein with respect to the issue of the Shares.

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As such counsel, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter. With your consent, we have relied upon certificates and other assurances of officers of the Company and others as to factual matters without having independently verified such factual matters. We are opining herein as to the General Corporation Law of the State of Delaware (the “DGCL”), and we express no opinion with respect to any other laws.

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, when the Shares shall have been duly registered on the books of the transfer agent and registrar therefor in the name or on behalf of the purchasers, and have been issued by the Company against payment therefor in the circumstances contemplated by the Underwriting Agreement, the issue and sale of the Shares will have been duly authorized by all necessary corporate action of the Company and the Shares will be validly issued, fully paid and non-assessable. In rendering the foregoing opinion, we have assumed that the Company will comply with all applicable notice requirements regarding uncertificated shares provided in the DGCL.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion as an exhibit to the Company’s Current Report on Form 8-K dated February 17, 2026 and to the reference to our firm in the Prospectus under the heading “Legal matters.” In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

Sincerely,

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/s/ Latham & Watkins LLP

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