GPT-5.5 Pro

openai/gpt-5.5-pro

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

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Context window: 1.1M
Input: Image · Text
Output: Text
Released: 2026-04-23

Max output: 128K
Knowledge cutoff: 2025-12-01
Weights: Closed
Capabilities: Attachments, Reasoning, Structured, Tool call

Pricing

$30.00 – $60.00

USD / 1,000,000 token

$30.00 · prompt: <=272000 input tokens

$60.00 · prompt: >272000 input tokens

OUT

$180.00 – $270.00

USD / 1,000,000 token

$180.00 · prompt: <=272000 input tokens

$270.00 · prompt: >272000 input tokens

Estimate usage cost

Compare verified public prices for this exact model and region. Enter uncached input and cache usage separately. Estimates exclude unspecified fees, credits and currency conversion. Set requests to zero to estimate token charges only.

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Output tokens

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Batch processing

Performance

Overall capability

53.2/100

Coding: —
Reasoning: 74.1
Professional work: —
Knowledge & language: 46.2


Chess Puzzles	Reasoning	Epoch AI	2026-11-05
FrontierMath v2 Tiers 1–3	Reasoning	Epoch AI	2026-11-05
CritPtGPT-5.5 Pro (Xhigh)	Reasoning	Artificial Analysis	2026-11-05
BullshitBench v2	Knowledge & language	BullshitBench	2026-11-05
Chess Puzzles	Reasoning	Epoch AI	2026-10-18
Chess Puzzles	Reasoning	Epoch AI	2026-10-17
FrontierMath	Reasoning	Epoch AI	2026-04-23
Humanity's Last Exam	Knowledge & language	Center for AI Safety / Scale AI	2026-04-23

Providers

				Input	Output	Cache read	Cache write
OpenAI	gpt-5.5-pro	Openai responses	global			-	-
OpenRouter	openai/gpt-5.5-pro	Openai chat	global			-	-

ModelRegistry · Catalog updated 2026-11-05