Models/OpenAI/GPT-5.5 Pro

GPT-5.5 Pro

Name: GPT-5.5 Pro API access
Brand: OpenAI

OpenAI · Proprietary · Released Apr 24, 2026 · openai/gpt-5.5-pro

Compare Estimate cost

1.05M contextVisionToolsReasoningStructured output

Available from 2 providersUSD / MTOK · VERIFIED 4 MINUTES AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
OpenAIopenai/flex1ST PARTY	$15.00	$90.00	$3.00	1.05M	—	6.4s	192 tok/s	100.0%
OpenAIopenai1ST PARTY	$30.00	$180.00	$3.00	1.05M	—	—	—	100.0%

TTFT/TPS: median (P50) over trailing 72h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 44 hours ago

Pricing variants · USD / MTok in / out

STANDARD

$15.00 / $90.00

per MTok in / out

BATCH

$7.50 / $45.00

async batch

CACHE READ $3.00WEB SEARCH $0.01 / search

About

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...

Specifications

Context window1,050,000

Max output128,000

Modalities infile, image, text

Modalities outtext

LicenseProprietary

ReleasedApr 24, 2026

Knowledge cutoff2025-12-01

TokenizerGPT

GPT-5.6 Luna Pro$0.10 / $0.60 GPT-5.6 Luna$0.10 / $0.60 GPT-5.6 Terra Pro$1.00 / $6.00 GPT-5.6 Terra$1.00 / $6.00

Embed badge

[![GPT-5.5 Pro](https://modelindex.ai/badge/openai/gpt-5.5-pro)](https://modelindex.ai/models/openai/gpt-5.5-pro)

Sources

OpenRouter API4 minutes ago

AGGREGATOR

LiteLLM dataset4 minutes ago

AGGREGATOR

ModelIndex benchmarks44 hours ago

MEASURED

Verified 4 minutes ago · list prices, not negotiated rates.