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Pricing
OpenAI

GPT-5.5 API

GPT-5.5 is positioned for complex professional work spanning coding, analysis and multi-step tasks.

MODALITIES
TextText
Available
INPUT / OUTPUT80% OFF
$1/ 1M
/
$6/ 1M
USD per million tokens
CACHED INPUT
$0.1/ 1M
Platform price · USD
CONTEXT WINDOW
1,050,000tokens
Max output: 128,000 tokens

API Usage Examples

API documentation ↗
POSTGet API Key ↗
curl 'https://newrouters.com/v1/chat/completions' \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $MODEL_API_KEY" \
  --data '{
  "model": "gpt-5.5",
  "messages": [
    {
      "role": "user",
      "content": "Explain how an HTTP request works in three concise steps."
    }
  ],
  "max_completion_tokens": 1024,
  "stream": false
}'

Set MODEL_API_KEY in your server environment. Requests use this model’s native API and your account pricing.

Docs: authentication and keys · Error handling

GPT-5.5 pricing

Estimate one request, then choose a budget for your workflow.

UsageQuantityRateCost
tokens$1/ 1M$0.001
tokens$0.1/ 1M$0
tokens$6/ 1M$0.003
tokens$6/ 1M$0
Cost per request$0.004

Public USD estimate. Your account rate and final recorded usage determine the actual charge.

Model pricing details
SpecificationOur priceOfficial reference
Input · input ≤ 272,000$1 / 1M tokens$5 About 80% less than official
Input · input > 272,000$2 / 1M tokens$10 About 80% less than official
Cached input · input ≤ 272,000$0.1 / 1M tokens$0.5 About 80% less than official
Cached input · input > 272,000$0.2 / 1M tokens$1 About 80% less than official
Output · input ≤ 272,000$6 / 1M tokens$30 About 80% less than official
Output · input > 272,000$9 / 1M tokens$45 About 80% less than official
Reasoning · input ≤ 272,000$6 / 1M tokens$30 About 80% less than official
Reasoning · input > 272,000$9 / 1M tokens$45 About 80% less than official

GPT-5.5 API · Examples

Original prompts adapted to documented capabilities; these are not vendor-generated outputs.

Official source ↗ · 2026-10-14

EXAMPLE PROMPT

Read these module relationships and code. Plan a staged refactor preserving API contracts. List affected files and regression checks for each step. Code: [paste code]

USER MESSAGE
01

Cross-module refactoring

Plan a verifiable staged refactor without silently changing API contracts.

EXAMPLE PROMPT

Compare the evidence, assumptions and risks in these three proposals. Flag unverified conclusions and list the next checks. Proposals: [paste material]

USER MESSAGE
02

Multi-step research

Compare evidence across documents while keeping assumptions and unresolved checks explicit.

What Is GPT-5.5?

GPT-5.5 is positioned for complex professional work spanning coding, analysis and multi-step tasks.

Official model information ↗ · 2026-10-14

GPT-5.5 Platform specifications

SpecificationGPT-5.5
Model IDgpt-5.5
ProviderOpenAI
API/v1/chat/completions · /v1/responses
Context window1,050,000 tokens
Maximum output128,000 tokens
Declared capabilitiesTools · Streaming · Reasoning · Structured output
Protocol & capability details

Protocol & capabilities

openai · gpt-5.5

Context limit
1050000
Maximum output
128000

tools · stream · reasoning · structured_output

Compare GPT-5.5 with related models

SpecificationGPT-5.5GPT-5.6 LunaGPT-5.6 Sol
ProviderOpenAIOpenAIOpenAI
Input → outputTextTextTextTextTextText
Selection basisCurrent modelSame openai protocol · Same billing unitsSame openai protocol · Same billing units
Context / max output1,050,000 / 128,0001,050,000 / 128,0001,050,000 / 128,000
Starting price$1 / 1M tokens$0.2 / 1M tokens$1 / 1M tokens

Choose by the input types, output settings and billing unit your workflow needs. Try the same prompt across models to compare results for your own use case.

Integrate GPT-5.5 into your app

Keep the native request format and point your application to the platform API. Prepare a key with model access, then review status and charges in your usage records.

View API examples

GPT-5.5 API · Common Questions

Everything you need to know about API access, pricing and model capabilities.

How is GPT-5.5 billed?

Charges depend on the recorded token usage and your account rates. Input, output and supported cache or reasoning categories are listed separately in the pricing table. The calculator uses public USD prices; the final usage receipt determines the charge.

How do I get an API key?

Choose “Get API access” to open the integration guide. Sign in to your NewRouters account, prepare a key with access to this model and copy an API example.

Which API endpoints can I use?

Supported endpoints: /v1/chat/completions、/v1/responses. Choose an endpoint in the API examples to see its native request format.

Does the model support streaming?

The current model route declares streaming support. Use the native endpoint’s streaming option and consume its events. Usage already completed may still be billed if the connection is interrupted.

Can I use tools or structured output?

Tools: supported. Structured output: supported. Request fields follow the selected native endpoint.

Where can I check usage and charges?

Keep the request ID and open your account’s LLM usage records to inspect request status, token counts and charges. Prompt and answer content are not a conversation history in this view.

Explore LLM Use Cases

All LLM models ↗

Integration topics / Documentation

All documentation ↗