OpenAI

GPT-5.5 Pro

CTX1.05M

97Quality

Reasoning · Vision · Tools

Input$30/M

Output$180/M

Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding

PaidProprietary892/1044

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OpenAITextHolo rare

GPT-5.5 Pro

Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding

gpt-5.5-pro

Type: Text
Quality: 97 · Top 3% on the Epoch Capabilities Index
Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input price: $30.00 / 1M tokens
Output price: $180 / 1M tokens
Cache read: —
Cache write: —
Released: Apr 23, 2026
Knowledge cutoff: Dec 2025
Takes in: Text, Image, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Holo rare
Set number: 892/1044

Open OpenAI docs Quality 97 Where to run it 21 Evolution 4/4 Meet its creature Battle Claude Fable 5.1

Weights aren’t public. Use is governed by OpenAI’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: platform.openai.com.

How good is it?

Public leaderboard scores for GPT-5.5 Pro, refreshed daily from Epoch AI and LMArena.

Top 3% of the 277 models on the Epoch Capabilities Index: #10.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#10 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.162.0 index

Benchmarks Epoch AI runs

88%FrontierMathUnpublished research-level math problems, tiers 1–3

Scores from Epoch AI, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

21 providers sell GPT-5.5 Pro through an API. Prices are per million tokens, cheapest first.

CheapestPoe$27.27 in · $164 out
From the labOpenAI$30.00 in · $180 out

API providers

Provider	Input	Output	Context
PoeCheapest paid`openai/gpt-5.5-pro`	$27.27	$164	400K
AIHubMix`gpt-5.5-pro`	$30.00	$180	1.05M
Cloudflare AI Gateway`openai/gpt-5.5-pro`	$30.00	$180	1M
CrossModel`openai/gpt-5.5-pro`	$30.00	$180	1.05M
DevPass (LLM Gateway)`gpt-5.5-pro`	$30.00	$180	1.05M
Eden AI`openai/gpt-5.5-pro`	$30.00	$180	1.05M
FastRouter`openai/gpt-5.5-pro`	$30.00	$180	1.05M
Impossibl`openai/gpt-5.5-pro`	$30.00	$180	1.05M
Kilo Gateway`openai/gpt-5.5-pro`	$30.00	$180	1.05M
LLM Gateway`openai/gpt-5.5-pro`	$30.00	$180	1.05M

Show 11 more providers

Provider	Input	Output	Context
Neon`gpt-5-5-pro`	$30.00	$180	1.05M
OpenAIOfficial`gpt-5.5-pro`	$30.00	$180	1.05M
OpenCode`gpt-5.5-pro`	$30.00	$180	1.05M
OpenRouter`openai/gpt-5.5-pro`	$30.00	$180	1.05M
Opper`gpt-5.5-pro`	$30.00	$180	1.05M
OrcaRouter`openai/gpt-5.5-pro`	$30.00	$180	1.05M
Requesty`gpt-5.5-pro`	$30.00	$180	1.05M
Venice AI`openai-gpt-55-pro`	$30.00	$180	1M
Vercel AI Gateway`openai/gpt-5.5-pro`	$30.00	$180	1M
ZenMux`openai/gpt-5.5-pro`	$30.00	$180	1.05M
AI/ML API`openai/gpt-5.5-pro`	$41.26	$248	1.05M

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

GPT-5.5 Pro

GPT-5.5 Pro

How good is it?

Leaderboards

Benchmarks Epoch AI runs

Where to run it

API providers

Face off

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