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Chat with GPT-5.5, OpenAI's reasoning model for coding, research and complex knowledge work, in your browser or through the API.
- From $1.40 in / $8.40 out per 1M tokensSave up to 72%
- OpenAI Responses and OpenAI Chat Completions API
- Coding · Research · Knowledge work
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What is GPT-5.5?
GPT-5.5 is an OpenAI reasoning model. OpenAI positions it for agentic coding, knowledge work, scientific research and tasks that need several connected steps.
On UniRoute, you can ask a question in the chat box or integrate the model through Responses and Chat Completions. Use it to work through code, compare documents and turn rough material into a clear plan.
OpenAI's description of GPT-5.5 emphasizes coding agents, research and broader professional workflows. It describes work that spans understanding a problem, planning a solution and checking the result, rather than code generation alone.
What you can do
What GPT-5.5 is built for.
Code review and debugging
Share the relevant code and describe the expected behavior. Ask for a diagnosis, a proposed fix and tests that would check the change.
Research and technical analysis
Bring research notes or technical questions into the conversation, compare explanations and identify what evidence is still missing.
Knowledge work
Turn scattered notes into a report, a decision brief or an implementation plan, then refine it with follow-up instructions.
Agent integration
Use the API to connect the model to function calls and search in your own application. Keep the application in control of the tools it runs.
The chat box accepts text; attachments, function calls, search and reasoning controls belong in API requests.
Specs & variants
The variants you can call, with their options and prices.
| Variant | Model ID | Modes | Inputs | Output | Price |
|---|---|---|---|---|---|
| GPT-5.5 | gpt-5-5 | Chat and text generation | OpenAI Responses and OpenAI Chat Completions API | Streaming; Context window: Not stated on this page | $1.40 input / $8.40 output per 1M tokens |
Pricing
Priced per token. Input and output are billed separately.
| Usage | Official API | UniRoute | Save |
|---|---|---|---|
| Input | $5.00 | $1.40 | Save 72% |
| Output | $30.00 | $8.40 | Save 72% |
| Cache read | $0.50 | $0.14 | Save 72% |
Official price: developers.openai.com · 2026-11-07
Prices updated 2026-11-08.
Pay as you go from a single USD wallet balance. You see the quote before each request.
API
Call GPT-5.5 through OpenAI Responses and OpenAI Chat Completions API.
curl 'https://api.uniroute.app/v1/responses' \ -H 'Authorization: Bearer YOUR_API_KEY' \ -H 'Content-Type: application/json' \ -d '{ "model": "gpt-5-5", "input": "Hello", "stream": false}'from openai import OpenAIclient = OpenAI( api_key="YOUR_API_KEY", base_url="https://api.uniroute.app/v1",)response = client.responses.create( model="gpt-5-5", input="Hello",)print(response.output_text)curl 'https://api.uniroute.app/v1/chat/completions' \ -H 'Authorization: Bearer YOUR_API_KEY' \ -H 'Content-Type: application/json' \ -d '{ "model": "gpt-5-5", "messages": [ { "role": "user", "content": "Hello" } ], "stream": false}'Parameters
| Name | In | Description |
|---|---|---|
model | Body | Model ID to run. |
messages | Body | The conversation as a list of role and content messages. |
stream | Body | Set to true to receive the response as a stream. |
input | Body | Text or input items (OpenAI Responses). |
max_output_tokens | Body | Upper limit on generated tokens (OpenAI Responses). |
Guides
Benchmarks & ranking
Published scores next to the models they were compared with.
| Evaluation | GPT-5.5 Thinking | GPT-5.4 Thinking | GPT-5.5 Pro | GPT-5.4 Pro | Claude Opus 4.7 | Gemini 3.1 Pro |
|---|---|---|---|---|---|---|
| Terminal-Bench 2.0 | 82.70% | 75.10% | — | — | 69.40% | 68.50% |
| GDPval | 84.90% | 83.00% | 82.30% | 82.00% | 80.30% | 67.30% |
| OSWorld-Verified | 78.70% | 75.00% | — | — | 78.00% | — |
| Toolathlon | 55.60% | 54.60% | — | — | — | 48.80% |
| BrowseComp | 84.40% | 82.70% | 90.10% | 89.30% | 79.30% | 85.90% |
| FrontierMath Tier 1–3 | 51.70% | 47.60% | 52.40% | 50.00% | 43.80% | 36.90% |
| FrontierMath Tier 4 | 35.40% | 27.10% | 39.60% | 38.00% | 22.90% | 16.70% |
| CyberGym | 81.80% | 79.00% | — | — | 73.10% | — |
Figures published by OpenAI from its own evaluations. Results depend on each benchmark’s configuration.
Use cases
Typical ways to put GPT-5.5 to work.
Engineering reviews
Review a proposed change for logic errors, missing cases and consistency with the surrounding code.
Research briefs
Organize supplied material into findings, open questions and suggested next steps.
Internal workflow assistants
Build an assistant that drafts reports and uses your application’s tools through the API.
FAQ
Common questions about GPT-5.5.
What is GPT-5.5?
GPT-5.5 is OpenAI's reasoning model for agentic coding, knowledge work, research and complex tasks. You can chat with it here or integrate it through the API.
Which GPT-5.5 variant can I use here?
This page offers the callable gpt-5-5 model. Thinking and Pro names in broader product descriptions do not add separate choices to this workspace.
How do I call GPT-5.5 from code?
Create a UniRoute API key and use gpt-5-5 as the model ID. The API section shows Responses and Chat Completions request examples.
How much does GPT-5.5 cost?
From $1.40 input / $8.40 output per 1M tokens. Input and output are metered separately. The Pricing section shows the available rates and worked examples, with prices updated 2026-11-08.
Can the chat box use files and tools?
The chat box accepts text. Use the API for attachments, function calls, search and reasoning controls.
Is there a free trial or free credits?
No. Requests are paid from your wallet balance. You can read this page and review the prices without paying, and you need an account with funds to send a message.
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