OpenAI

GPT-5.5

gpt-5.5

Long-context GPT flagship

GPT-5.5 is OpenAI's long-context GPT flagship for professional reasoning, writing, and long-document analysis, with a 400K context window. Best for workflows that need longer inputs, stable reasoning, and high-quality text output, and the previous-generation flagship before GPT-5.6.

Context window1M context
Released2026-04-23
Relays82 sites
400K contextReasoningWritingLong documentsTool use

Model information

Model ID
gpt-5.5
Context
1.1M
Max input
922K
Max output
128K
Knowledge cutoff
2025-12-01
Open weights
Not supported
License
-
Release date
2026-04-23

Input

Text: SupportedImage: SupportedAudio: Not supportedVideo: Not supportedPDF: SupportedFile: Supported

Output

Text: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported

API capabilities

Reasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Not supported

OpenAI Official Pricing

CNY
Updated: 2026-10-04T22:55:12.995+08:00

Input

~¥33.447/ 1M tokens

Output

~¥200.68/ 1M tokens

Cache read

~¥3.345/ 1M tokens

Relay Comparison

Compare token, per-request, or per-second pricing by relay channel.

How should GPT-5.5 relay pricing be compared?

This GPT-5.5 pricing page compares official pricing with public prices from 82 listed AI gateways. Token prices are shown in CNY per 1M tokens, while per-request, per-second, and per-character rows use the unit shown in the table. Last updated: 10/23/2026, 08:16.

Data sources
Public price catalogs, official pricing records, and monitoring results.
Metric definitions
Uptime means successful probe response rate, fake-rate signals possible model mismatch or abnormal output risk, and latency is average API response time.
Risk note
Relay gateways are third-party services. Pricing, billing, privacy, and stability can change; start with a small top-up and verify reliability before continued use.