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Sources & verification notes

GPT-5.4

gpt-5.4
  • Exact identifier & access

    Undated API identifier. This pilot does not claim an immutable weights snapshot behind it.

  • First availability

    Effective Mar 5, 2026. Checked Sep 13, 2026. Re-verification needed.

  • 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-5.4-2026-03-05`; 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-5.4-2026-03-05`; values are that snapshot's as of 2026-09-23.

GPT-5.5

gpt-5.5
  • Exact identifier & access

    Undated API identifier. This pilot does not claim an immutable weights snapshot behind it.

  • First availability

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

    First API availability; the launch post (April 23, 2026) announced ChatGPT availability first.

  • Availability status

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Re-checked: no deprecation notice on the model or deprecations page.

  • Capabilities & limits

    Effective date not established; this is an observation. Checked Oct 20, 2026.

    Re-checked against the model page: 1,050,000 context (922,000 maximum input), 128,000 maximum output.

    • GPT-5.5 ↗OpenAI · provider-authored · checked Oct 20, 2026
  • 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-5.5-2026-04-23`; values are that snapshot's as of 2026-09-23.

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