GPT-5.5 Pro

Name: GPT-5.5 Pro
Brand: openai
SKU: openai/gpt-5.5-pro
Price: 31.5 USD
Availability: InStock

openai/gpt-5.5-pro

text, image, document in · text out · 272,000 context · 128,000 max output

toolsschemavisionreasoningno-trainShow prices also in

Effective cost per 1k requestsInput tokens 2,000Output tokens 500Cached share 50%

cost = p_in·(input − cached) + p_cache_read·cached + p_out·output + p_req; cached tokens are the prefix a sticky endpoint already holds (part2b §9.3), which is why the cheapest list price is not always the cheapest request.

Provider	Region · quant	Context / max out	Input / M	Output / M	Cache read / write	Markup	Per 1k req	Uptime 30 d	TTFT p50 / p95	Throughput	Last 24 h	Fidelity	Data	Capabilities	Status
OpenRouter	global · unknown	272,000 / 128,000	$31.50	$189.00	— / —	+5.0%	$157.500	—	—	—	no traffic	—	no-train 30 d	model default	active

Quick start

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

Get a key in the console

Changelog

new_model model openai/gpt-5.5-pro added (active); endpoint ep_openrouter_gpt-5.5-pro_global (openai/gpt-5.5-pro) added as active; price input 31.500 output 189.000 USD/M 10/5/2026