OpenAI

GPT-5.5

CTX1.05M

95Quality

Reasoning · Vision · Tools

Input$5/M

Output$30/M

Default frontier GPT for coding, computer use, research, and knowledge work

PaidProprietary891/1044

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OpenAITextHolo rare

GPT-5.5

Default frontier GPT for coding, computer use, research, and knowledge work

gpt-5.5

Type: Text
Quality: 95 · Top 5% on the Epoch Capabilities Index
Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input price: $5.00 / 1M tokens
Output price: $30.00 / 1M tokens
Cache read: $0.50 / 1M tokens
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: 891/1044

Open OpenAI docs Quality 95 Where to run it 50 Evolution 11/12 Meet its creature Battle Fugu Ultra

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, refreshed daily from Epoch AI and LMArena.

Top 5% of the 277 models on the Epoch Capabilities Index: #15.

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#15 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.159.0 index
LMArena Text#28 of 416
People compare two anonymous answers and vote for the better one.1,471 rating
Listed as gpt-5.5-high
LMArena Text · Coding#32 of 411
The text arena’s coding prompts only.1,494 rating
Listed as gpt-5.5-high
LMArena Text · Math#24 of 400
The text arena’s math prompts only.1,487 rating
LMArena Text · Creative writing#29 of 414
The text arena’s creative writing prompts only.1,455 rating
Listed as gpt-5.5-high
LMArena WebDev#56 of 145
Each model builds a web app from the same prompt; people pick the better one.1,513 rating
Listed as GPT-5.5 (xHigh, Codex Harness)
LMArena Vision#21 of 165
Questions about images, voted by people.1,297 rating

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, 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

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

CheapestXpersona$1.50 in · $12.00 out
Free to try2 providersKenari, UnoRouter
From the labOpenAI$5.00 in · $30.00 out

API providers

Provider	Input	Output	Context
KenariFree`gpt-5-5`	Free	Free	1.05M
UnoRouterFree`gpt-5.5:free`	Free	Free	1.05M
XpersonaCheapest paid`gpt-5.5`	$1.50	$12.00	1.05M
FrogBot`gpt-5-5`	$2.50	$15.00	272K
Poe`openai/gpt-5.5`	$4.55	$27.27	400K
302.AI`gpt-5.5`	$5.00	$30.00	1.05M
Abacus`gpt-5.5`	$5.00	$30.00	1M
AI-ROUTER`gpt-5.5`	$5.00	$30.00	1.05M
AIHubMix`gpt-5.5`	$5.00	$30.00	1.05M
Azure`gpt-5.5`	$5.00	$30.00	1.05M

Show 40 more providers

Provider	Input	Output	Context
Azure Cognitive Services`gpt-5.5`	$5.00	$30.00	1.05M
Cloudflare AI Gateway`openai/gpt-5.5`	$5.00	$30.00	1M
CommandCode`gpt-5.5`	$5.00	$30.00	400K
CrossModel`openai/gpt-5.5`	$5.00	$30.00	1.05M
DaoXE`gpt-5.5`	$5.00	$30.00	1.05M
Databricks`databricks-gpt-5-5`	$5.00	$30.00	1.05M
DevPass (LLM Gateway)`gpt-5.5`	$5.00	$30.00	1.05M
Eden AI`openai/gpt-5.5`	$5.00	$30.00	1.05M
FastRouter`openai/gpt-5.5`	$5.00	$30.00	1.05M
FreeModel`gpt-5.5`	$5.00	$30.00	1.05M
GitHub Copilot`gpt-5.5`	$5.00	$30.00	1.05M
GMI Cloud`openai/gpt-5.5`	$5.00	$30.00	1.05M
HPC-AI`openai/gpt-5.5`	$5.00	$30.00	1.05M
Impossibl`openai/gpt-5.5`	$5.00	$30.00	1.05M
Kilo Gateway`openai/gpt-5.5`	$5.00	$30.00	1.05M
LLM Gateway`azure/gpt-5.5`	$5.00	$30.00	1.05M
LowRouter`auto/openai/gpt-5.5`	$5.00	$30.00	1.05M
Merge Gateway`openai/gpt-5.5`	$5.00	$30.00	1.05M
NanoGPT`openai/gpt-5.5`	$5.00	$30.00	1.05M
NEAR AI Cloud`openai/gpt-5.5`	$5.00	$30.00	1.05M
Neon`gpt-5-5`	$5.00	$30.00	1.05M
Ofox`openai/gpt-5.5`	$5.00	$30.00	1.05M
OpenAIOfficial`gpt-5.5`	$5.00	$30.00	1.05M
OpenCode`gpt-5.5`	$5.00	$30.00	1.05M
OpenRouter`openai/gpt-5.5`	$5.00	$30.00	1.05M
Opper`gpt-5.5`	$5.00	$30.00	1.05M
OrcaRouter`openai/gpt-5.5`	$5.00	$30.00	1.05M
Perplexity Agent`openai/gpt-5.5`	$5.00	$30.00	1.05M
Pioneer`gpt-5.5`	$5.00	$30.00	1.05M
Prime Inference`openai/gpt-5.5`	$5.00	$30.00	1.05M
SAP AI Core`gpt-5.5`	$5.00	$30.00	1.05M
Venice AI`openai-gpt-55`	$5.00	$30.00	1M
Vercel AI Gateway`openai/gpt-5.5`	$5.00	$30.00	1M
Vivgrid`gpt-5.5`	$5.00	$30.00	1.05M
ZenMux`openai/gpt-5.5`	$5.00	$30.00	1.05M
Amazon Bedrock`openai.gpt-5.5`	$5.50	$33.00	1M
Requesty`gpt-5.5`	$5.50	$33.00	1.05M
AI/ML API`openai/gpt-5-5`	$6.50	$39.00	1.05M
Model Oracle AI`gpt-5.5`	—	—	1.05M
Snowflake Cortex`openai-gpt-5.5`	—	—	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

GPT-5.5

How good is it?

Leaderboards

Benchmarks Epoch AI runs

Where to run it

API providers

Face off

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