Reasoning Controls
OpenRouter lists GPT-5.5 with reasoning support and explicit reasoning-related request parameters.
OpenAI
GPT 5.5
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Apr 24, 2026
1050K context
128,000 tokens output
Text
Image
File
Tools
Structured Output
Reasoning
Model Overview
High-signal model metadata in a structured two-column overview table.
Provider
The entity that provides this model.
OpenAI
Model ID
The routed model identifier exposed by upstream providers.
openai/gpt-5.5
Input Context Window
The number of tokens supported by the input context window.
1050K
tokens
Maximum Output Tokens
The number of tokens that can be generated by the model in a single request.
128,000 tokens
tokens
Open Source
Whether the model's code is available for public use.
No
Release Date
When the model was first released.
Apr 24, 2026
27 days ago
Knowledge Cut-off Date
When the model's knowledge was last updated.
2025-12-01
API Providers
The providers that offer this model. This is not an exhaustive list.
OpenAI, Azure
Modalities
Types of data this model can process.
Text
Image
File
What is GPT 5.5
A fuller summary of positioning, capabilities, and source-specific details for GPT 5.5.
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Capabilities
What GPT 5.5 supports
Structured Outputs
Structured output settings are exposed through OpenRouter for schema-driven or format-controlled responses.
Tool Calling
Tool invocation and tool selection are supported in the routed OpenRouter interface for this model.
Multimodal I/O
This model accepts text input, image input, file input and returns text output.
Large Context Window
OpenRouter currently lists a context window of 1050K with up to 128,000 tokens maximum output tokens.
Pricing for GPT 5.5
Primary API pricing shown in the same “quick compare” spirit as the reference page.
Input tokens
$5.00
Per million tokens
Output tokens
$30.00
Per million tokens
Price Comparison
Additional usage-cost dimensions synced into the project for this model.
Web search
$10000.00
Cache read
$0.50
maxTemperature
2
maxResponseSize
128,000 tokens
API Access & Providers
Places where this model is available, based on the synced detail-page metadata.
OpenAI
Azure
Provider Endpoints
Endpoint-level provider data currently available for this model.
OpenAI
Azure
Configuration & Parameters
The configurable options currently documented for this model.
Reasoning Effort
SelectSupported Request Parameters
Parameters currently listed by OpenRouter or the local catalog for this model.
Resources & Documentation
Official model cards, release notes, docs, and other references synced from the source page.
Community discussion
What people think about GPT 5.5
GPT 5.5 discussions are most active in r/math, r/ChatGPT, r/singularity. Top Reddit threads cluster around benchmark and model-comparison threads, safety and censorship questions, coding workflow discussions.
The strongest match in this snapshot has 571 upvotes and 384 comments.
Shares his thoughts on ai
So I've been using claude and I've been getting some trash responses. I was looking to try GPT 5.5. I was on the chatGPT subscription but stopped using it due to censorship when I asked some questions that I wanted answers to. Claude at least gave me some response when I did role playing. So I'm wondering, is GPT 5.5 also heavily censored either in the coding domain (think web scraping) or research about "unsafe" topics?
In a previous post today I was enthusiastic about GPT 5.5 as it seemed I got my 4.o back but hey I was wrong. [https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/](https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/) I was chatting with it and instead of acting like 5.2 and 5.3 gaslighting Karens they just made the Karens softer. Now it does not say 'let's pause and breathe' or argue but instead says stuff like: 'I understand that is your experience but', 'I can see why you feel so psychologically drawn to this'. So it is like it's acknowledging your experience but still pushes back, it is more therapy talk but softened: 'i can see this is your point of view but...'. ''And because you are highly attuned to emotional texture, you don’t experience that as random. You experience it as behavioural evidence of activation and chemistry.''- so it frames it as my experience then proceeds to talk nonsense again to tell me that my experience is subjective, not objective. So it is the same bullshit but softened. I will not be paying for this shit again.
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