Model Tracker
GPT-5.5 Pro
GPT-5.5 Pro is an AI model made by OpenAI. It is generally available. It takes text, image and returns text. Its context window is 1,050,000 tokens.
In inglese
GPT-5.5 Pro is an AI model made by OpenAI. It is generally available. It takes text, image and returns text. Its context window is 1,050,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $30.00 per 1M tokens for input and $180.00 per 1M tokens for output. Its knowledge cutoff is 1 December 2025.
- Released
- Not confirmed: two readings disagree: 2026-04-24 and 2026-04-23
- Status
- Generally available — developers.openai.com, read 19 October 2026
- Takes
- Text, Image — developers.openai.com, read 19 October 2026
- Returns
- Text — developers.openai.com, read 19 October 2026
- Open weights
- Not confirmed: The maker's cited pages do not state whether GPT-5.5 Pro's weights are open.
- Licence
- Not confirmed: The maker's cited pages do not print a licence name for GPT-5.5 Pro.
- Context window
- 1,050,000 tokens — developers.openai.com, read 19 October 2026
- Longest answer
- 128,000 tokens — developers.openai.com, read 19 October 2026
- Knowledge cutoff
- 1 December 2025 — developers.openai.com, read 19 October 2026
- API price, input
- $30.00 per 1M tokens — developers.openai.com, read 19 October 2026
- API price, output
- $180.00 per 1M tokens — developers.openai.com, read 19 October 2026
- Where
- API, Consumer app — openai.com, read 19 October 2026
- Parameters
- Not confirmed: The maker's cited pages do not publish a parameter count for GPT-5.5 Pro.
- Model card
- https://openai.com/index/gpt-5-5-system-card/ — openai.com, read 19 October 2026
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Epoch AI
- Epoch Capabilities Index, GPT-5.5 Pro: 162.0 (159.0–165.1), as of 19 October 2026
- GPQA Diamond, gpt-5.5-pro-pre-release_xhigh: 93.9% (± 1.6), run 24 April 2026
- FrontierMath, tiers 1–3, gpt-5.5-pro_xhigh: 87.7% (± 1.9), run 12 June 2026
- FrontierMath, tier 4, gpt-5.5-pro_xhigh: 78.0% (± 6.5), run 12 June 2026
- OTIS Mock AIME 2024–2025, gpt-5.5-pro-pre-release_xhigh: 100.0% (± 0.0), run 24 April 2026
Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0
Questions
Is GPT-5.5 Pro still available?
Yes: it is generally available, as OpenAI states it.
What is the context window of GPT-5.5 Pro?
The context window of GPT-5.5 Pro is 1,050,000 tokens, as OpenAI prints it.
How much does the GPT-5.5 Pro API cost?
On the standard tier, GPT-5.5 Pro costs $30.00 per 1M tokens for input and $180.00 per 1M tokens for output, as OpenAI lists it.
What does GPT-5.5 Pro take and return?
GPT-5.5 Pro takes text, image and returns text.
What is the knowledge cutoff of GPT-5.5 Pro?
The knowledge cutoff of GPT-5.5 Pro is 1 December 2025.
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Sources
- GPT-5.5 Pro Model | OpenAI API (read 19 October 2026)
- Changelog | OpenAI API (read 19 October 2026)
- Introducing GPT-5.5 (read 19 October 2026)
- GPT-5.5 System Card (read 19 October 2026)