GPT-5.5-pro
gpt-5.5-pro
OpenAI · chat · api · seen 11m ago
Unavailable
Alert me on changes
Not currently available.
This model is listed by OpenAI but a live request is rejected, so it isn't usable right now.
We re-check every few minutes and will alert subscribers the moment it goes live.
Context
1.1M
Max output
128K
Input $/1M
$30.00
Output $/1M
$180.00
Modalities
text
Released
22 Apr 2026
AI summary
● machine-written
OpenAI releases GPT-5.5-pro with enhanced reasoning for professional workloads
GPT-5.5-pro is OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1,050,000-token context window and supports up to 128,000 tokens of maximum output. The model is available via API with pricing at $30 per million input tokens and $180 per million output tokens.
What's new
- Context window expanded to 1,050,000 tokens for large-scale reasoning tasks
- Maximum output capacity of 128,000 tokens per response
- Optimized for deep reasoning and complex professional workflows
- Higher input pricing reflects enhanced capability tier versus standard GPT-5.5
Best for
Complex research and analysis requiring extended contextHigh-stakes professional decision-making and reasoningCoding and technical problem-solving at scaleDeep reasoning on complex workloads