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OpenAI: GPT-5.5 Pro

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. $30 per million input tokens, $180 per million output tokens. 1,050,000 token context window, maximum output of 128,000 tokens. Includes independent benchmarks from Artificial Analysis.

View source on OpenRouter
Overview

Model specifications

Context
1,050,000 tokens
Maximum output
128,000 tokens
Architecture
text+image+file->text
Tokenizer
GPT
Knowledge cutoff
2025-12-01
Moderated
Yes
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Input
$30
/M tokens
  • ≤272K$30
  • >272K$60
Output
$180
/M tokens
  • ≤272K$180
  • >272K$270
Web search
$10
/1K calls
API

Model configuration

Reasoning

Moderated
Yes
Default parameters
medium
Capabilities
xhigh, high, medium
API

Quick start

Call this exact model ID through OpenRouter’s OpenAI-compatible API.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.5-pro","messages":[{"role":"user","content":"Hello!"}]}'
Capabilities

Input → Output

Input
fileimagetext
Output
text
Reasoning

No · xhigh · high · medium

API

Supported API parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
Available providers

2 providers

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

OpenAI

unknown
Context
1.1M
Maximum output
128K
Input
$15.00
Output
$90.00
Cache read
Not provided
Cache write
Not provided

OpenAI

unknown
Context
1.1M
Maximum output
128K
Input
$30.00
Output
$180.00
Cache read
Not provided
Cache write
Not provided
openai

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OpenAI: GPT Transcribe

GPT Transcribe is a high-accuracy speech-to-text model from OpenAI. It is suited for recorded audio, streamed file transcription, and committed Realtime turns, with free-form context, keyword hints, and multiple language...

Context
Not provided
Input
audio
Output
transcription
Input: $4500.00Output: Freeper 1M tokens
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OpenAI: GPT-5.6 Luna Pro

GPT-5.6 Luna Pro is the same underlying model as GPT-5.6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Context
1.1M
Input
file · image · text
Output
text
Input: $0.200Output: $1.20per 1M tokens
View model details →
openai logoopenai

OpenAI: GPT-5.6 Luna

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...

Context
1.1M
Input
file · image · text
Output
text
Input: $0.200Output: $1.20per 1M tokens
View model details →
openai logoopenai

OpenAI: GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Context
1.1M
Input
file · image · text
Output
text
Input: $2.00Output: $12.00per 1M tokens
View model details →