GPT-5.5 pro
Default
Version of GPT-5.5 that produces smarter and more precise responses.
Version of GPT-5.5 that produces smarter and more precise responses.
Reasoning
Highest
Speed
Slowest
Price
$30•$180
Input•Output
Input
Text, image
Output
Text
GPT-5.5 pro uses more compute to think harder and provide consistently better answers.
GPT-5.5 pro is available for Responses API requests, including through the Batch API, to enable support for multi-turn model interactions before responding to API requests and other advanced API features in the future. Since GPT-5.5 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeouts, try using background mode.
1,050,000 context window
128,000 max output tokens
Dec 01, 2025 knowledge cutoff
Reasoning token support
Pricing
Pricing is based on the number of tokens used, or other metrics based on the model type. For tool-specific models, like search and computer use, there’s a fee per tool call. See details in the pricing page.
Text tokens
Per 1M tokens
∙
Batch API price
Input
$30.00
Output
$180.00
Quick comparison
Input
Output
GPT-5.5 pro
$30.00
GPT-5.4 pro
$30.00
GPT-5.5
$5.00
GPT-5.5 pro does not offer a cached input discount.
Regional processing (data residency) endpoints are charged a 10% uplift for GPT-5.5 pro.
Modalities
Text
Input and output
Image
Input only
Audio
Not supported
Video
Not supported
Endpoints
Chat Completions
v1/chat/completions
Responses
v1/responses
Realtime
v1/realtime
Assistants
v1/assistants
Batch
v1/batch
Fine-tuning
v1/fine-tuning
Embeddings
v1/embeddings
Image generation
v1/images/generations
Videos
v1/videos
Image edit
v1/images/edits
Speech generation
v1/audio/speech
Transcription
v1/audio/transcriptions
Translation
v1/audio/translations
Moderation
v1/moderations
Completions (legacy)
v1/completions
Features
Streaming
Not supported
Function calling
Supported
Structured outputs
Supported
Fine-tuning
Not supported
Distillation
Not supported
Tools
Tools supported by this model when using the Responses API.
Web search
Supported
File search
Supported
Image generation
Supported
Code interpreter
Supported
Hosted shell
Supported
Apply patch
Not supported
Skills
Not supported
Computer use
Not supported
MCP
Supported
Tool search
Not supported
Snapshots
Snapshots let you lock in a specific version of the model so that performance and behavior remain consistent. Below is a list of all available snapshots and aliases for GPT-5.5 pro.
gpt-5.5-pro
gpt-5.5-pro-2026-04-23
gpt-5.5-pro-2026-04-23
Rate limits
Rate limits ensure fair and reliable access to the API by placing specific caps on requests or tokens used within a given time period. Your usage tier determines how high these limits are set and automatically increases as you send more requests and spend more on the API.
| Tier | RPM | TPM | Batch queue limit |
|---|---|---|---|
| Free | Not supported | ||
| Tier 1 | 500 | 30,000 | 90,000 |
| Tier 2 | 5,000 | 450,000 | 1,350,000 |
| Tier 3 | 5,000 | 800,000 | 50,000,000 |
| Tier 4 | 10,000 | 2,000,000 | 200,000,000 |
| Tier 5 | 10,000 | 30,000,000 | 5,000,000,000 |