GPT-5.5 Pro

openai/gpt-5.5-pro

GPT-5.5 Pro is the high-capability variant of 5.5, listed with a 1,050,000-token window and file, image and text input. The reference targets deep reasoning and accuracy on high-stakes workloads.

Input · Account credit
$30.00

per 1M tokens

Cash equivalent $3.00

Output · Account credit
$180.00

per 1M tokens

Cash equivalent $18.00

Context window
1,050,000

tokens · OpenRouter

Input → Output
File · Image · Text→ Text
Model specifications
Sources reviewed: Y-API catalog snapshot:

Choosing this model

Selection advice by Y-API. The checks below are suggested evaluations, not published test results.

Where to start

Reserve it for decisions where being wrong is expensive and the reasoning is checkable: a data-model change, a numerical result, a security review with a concrete threat model.

What to watch for

This is the most expensive input rate in the catalog. Deep-reasoning variants also spend more tokens thinking, so the per-call cost is not the per-token rate alone — measure a realistic call before putting it on a path with volume.

Model specifications

These are OpenRouter model-level specifications, not a Y-API compatibility test. A particular route may accept fewer input formats, parameters or tokens. Verify the features you need with a small request; a successful text response does not validate vision or tool calling.

Context window
1,050,000 tokens
Input
File · Image · Text
Output
Text
Listed on OpenRouter
Parameters listed by OpenRouter
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity
OpenRouter model page & specifications

API pricing & cost estimate

Estimated credit consumed
$120.00
Estimated cash equivalent
$12.00

Illustrative token budget, not measured usage or a quote. Includes input and output; excludes separate media charges, cache discounts and retries. Include billed reasoning tokens in your output budget where applicable. Actual billing follows usage returned by the service.

$1 paid adds $10 of credit. Cash equivalent = credit consumed ÷ 10; this is not the model publisher’s list price.

Same token budget, different models
ModelEstimated credit consumedEstimated cash equivalent
GPT-5.5 Pro$120.00$12.00
GPT-5.5$20.00$2.00
GPT-6 Astra$35.00$3.50
View LLM API pricing & billing

API integration examples

These minimal, text-only requests use the exact Y-API model ID. They do not demonstrate image, audio, video, file or tool support. The output limit also needs room for reasoning; an empty answer with finish_reason=length can mean the budget was exhausted.

A task to try

Review this schema migration for a table with 40 million rows. Identify the step that would lock writes, propose an online alternative, and state how to roll back if the backfill fails halfway.

Set the TOKEN environment variable to a key from your console. Run this on your server or locally; never expose a key in browser code or a public repository.

cURL · GPT-5.5 Pro
curl --fail-with-body --silent --show-error --max-time 120 \
  'https://api.y-api.bestvirtualgoods.com/v1/chat/completions' \
  -H "Authorization: Bearer ${TOKEN:?Set TOKEN first}" \
  -H 'Content-Type: application/json' \
  --data-binary @- <<'JSON'
{
  "model": "openai/gpt-5.5-pro",
  "messages": [
    {
      "role": "user",
      "content": "Review this schema migration for a table with 40 million rows. Identify the step that would lock writes, propose an online alternative, and state how to roll back if the backfill fails halfway."
    }
  ],
  "max_tokens": 4096
}
JSON

How to evaluate the result

Look for the specific locking behaviour, not a general warning. The rollback plan should be executable at the halfway point, which is the case most plans skip.

Before you choose

Can I use this for bulk processing?

Technically yes, but check the cost per call first. Route bulk work to a cheaper entry and keep this one for the cases where a wrong answer is the expensive outcome.

Sources & scope

Technical facts come from the cited model page and, where available, its linked publisher card. A card describes that checkpoint; it is not proof of the weights a gateway serves. Prices come only from the Y-API catalog. We do not claim measured latency, uptime or benchmark scores for this endpoint.