Sources & verification notes
GPT-5.5
gpt-5.5Exact identifier & access
Undated API identifier. This pilot does not claim an immutable weights snapshot behind it.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026
First availability
Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026
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.
- Changelog ↗OpenAI · provider-authored · checked Sep 23, 2026
- Introducing GPT-5.5 ↗OpenAI · provider-authored · checked Sep 23, 2026
Availability status
Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026
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.
- GPT-5.5 ↗OpenAI · provider-authored · checked Oct 20, 2026
- Deprecations ↗OpenAI · provider-authored · checked Oct 20, 2026
Capabilities & limits
Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026
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 13, 2026. Re-verification needed.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 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.
- Pricing ↗OpenAI · provider-authored · checked Sep 23, 2026
- GPT-5.5 Model ↗OpenAI · provider-authored · checked Sep 23, 2026
Output price
Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026
Output price
Effective date not established; this is an observation. Checked Sep 23, 2026.
Derived from the captured rate card's standard token row.
- Pricing ↗OpenAI · provider-authored · checked Sep 23, 2026
- GPT-5.5 Model ↗OpenAI · provider-authored · checked Sep 23, 2026
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.
- GPT-5.5 Model ↗OpenAI · provider-authored · checked Sep 23, 2026
Official announcement
Effective Apr 23, 2026. Checked Sep 23, 2026.
- Introducing GPT-5.5 ↗OpenAI · provider-authored · checked Sep 23, 2026
Full rate card
Effective date not established; this is an observation. Checked Sep 23, 2026.
- Pricing ↗OpenAI · provider-authored · checked Sep 23, 2026
- GPT-5.5 Model ↗OpenAI · provider-authored · checked Sep 23, 2026
License
Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.
No downloadable-weights license is represented for this API offering.
- GPT-5.5 specifications ↗OpenAI · provider-authored · checked Sep 13, 2026