Compare models
GPT-5.5
A new class of intelligence for coding and professional work.
Reasoning
Speed
Input
Output
Reasoning tokens
Pricing
Per 1M tokens
Input
$5.00
Cached Input
$0.50
Output
$30.00
Context
Window
1,050,000
Max Output Tokens
128,000
Knowledge Cutoff
Dec 01, 2025
Endpoints
v1/chat/completions
v1/responses
v1/batch
Supported Features
Streaming
Function calling
Structured outputs
Image input
Rate Limits
TPM
Free
-
Tier 1
500,000
Tier 2
1,000,000
Tier 3
2,000,000
Tier 4
4,000,000
Tier 5
40,000,000
GPT-5.5 pro
Version of GPT-5.5 that produces smarter and more precise responses.
Reasoning
Speed
Input
Output
Reasoning tokens
Pricing
Per 1M tokens
Input
$30.00
Cached Input
-
Output
$180.00
Context
Window
1,050,000
Max Output Tokens
128,000
Knowledge Cutoff
Dec 01, 2025
Endpoints
v1/chat/completions
v1/responses
v1/batch
Supported Features
Streaming
Function calling
Structured outputs
Image input
Rate Limits
TPM
Free
-
Tier 1
50,000
Tier 2
200,000
Tier 3
500,000
Tier 4
1,000,000
Tier 5
4,000,000