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Sources & verification notes

GPT-5.5 Pro

gpt-5.5-pro
  • Exact identifier & access

    Identity and lifecycle apply to this exact identifier and serving surface.

  • First availability

    Effective Apr 24, 2026. Checked Sep 23, 2026.

    First API availability (Responses API).

  • Availability status

    Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Capabilities & limits

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Alias of the default snapshot `gpt-5.5-pro-2026-04-23`; values are that snapshot's as of 2026-09-23.

  • Input price

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Derived from the captured rate card's standard token row.

  • Output price

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Derived from the captured rate card's standard token row.

  • Model card

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Alias of the default snapshot `gpt-5.5-pro-2026-04-23`; values are that snapshot's as of 2026-09-23.

  • Official announcement

    Effective Apr 23, 2026. Checked Sep 23, 2026.

  • Full rate card

    Effective date not established; this is an observation. Checked Sep 23, 2026.

  • License

    Effective date not established; this is an observation. Checked Sep 23, 2026.

    Not verified. These sources establish the identifier, not this missing fact.

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