GPT-5.5 is the latest frontier model in the GPT-5 series with a 1M+ context window, offering improved agentic and long context performance. It uses adaptive reasoning to dynamically allocate computation across tasks.
Modalities
In / out price
$5.00 / $30.00
per 1M
Cached price
$0.50
per 1M
Context
272K
Max output
16K
Released
Apr 23, 2026
Providers
2 routesThe same model can have different pricing and privacy guarantees depending on who serves it. Only routes currently callable through AnonRouter are shown.
Privacy
1 / 4Anonymous routing
Anonymous tier
- Anonymous
- Private
- TEE
- E2EE
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Features
7Streaming
Tool calling
Reasoning
Vision
JSON/schema
Web search
Prompt caching