ModelActive

gpt-5.5-pro

OpenAI developers.openai.com/api/docs/models/gpt-5.5-pr

Version of GPT-5.5 that produces smarter and more precise responses.

Open in Graph

data quality64

Updated 5 h ago · first seen 11 Sept 2026

model_01M293V774W1B45EE968ACSQ4T

Overview

Identity

Identity block not returned by the API for this entity.

Openness

Openness not classified yet — no sourced evidence to place this model in the ontology.

Key facts

Release date: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Knowledge cutoff: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Official page: developers.openai.com/api/docs/models/gpt-5.5-pro
Source:OpenAI Platform docsT1observed 12 h agohigh
API model id: Source:OpenAI Platform docsT1observed 12 h agohigh
Openrouter id: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium

Architecture

Tokenizer: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium

Capabilities

Modalities

Modalities: imagetext
Input: imagetext
Output: text

Capabilities

Tool calling
Yes
OpenRouter public model & pricing listing · T2
Structured output
Yes
OpenRouter public model & pricing listing · T2
Reasoning
Yes
OpenRouter public model & pricing listing · T2
Vision
Yes
OpenRouter public model & pricing listing · T2
Audio
Unavailable
Fine-tuning available
Unavailable

Context window: Source:OpenRouter public model & pricing listingT2observed 9 h agomedium
Max output: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Knowledge cutoff: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Tokenizer: Source:OpenRouter public model & pricing listingT2observed 12 h agomedium

Providers & Pricing3

All offers in the price terminal →

Current prices per 1M tokens
Provider	Input / 1M	Output / 1M	Cached in	Batch in / out	Context	Observed	Source
OpenAI APIopenai/gpt-5.5-pro:batch	$15	$90	—	—	1.05M	3 h ago	openrouter.aiT2
OpenAI APIgpt-5.5-pro	$30	$180	—	$15 / $90	—	4 h ago	developers.openai.comT1
OpenAI APIopenai/gpt-5.5-pro	$30	$180	—	—	1.05M	3 h ago	openrouter.aiT2

USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.

Price history

Step lines per provider; amber markers are recorded changes. Click a marker or a row for the evidence behind that price.

Output price · USD / 1M tokens 1 provider

OpenAI API

OpenAI API$180 → $9011 Sept 2026
OpenAI APIfirst observed $18011 Sept 2026

Input price · USD / 1M tokens 1 provider

OpenAI API

OpenAI API$30 → $1511 Sept 2026
OpenAI APIfirst observed $3011 Sept 2026

Timeline6

Full timeline →

12 Sept 2026
Context window changedModelgpt-5.5-proOpenAI
gpt-5.5-pro: context length changed from 922000 to 1050000
Context window922K tokens→1.05M tokensopenrouter
openrouter.ai
11 Sept 2026
Context window changedModelgpt-5.5-proOpenAI
gpt-5.5-pro: context length changed from 1050000 to 922000
Context window1.05M tokens→922K tokensartificial_analysis
artificialanalysis.ai
11 Sept 2026
Listed by providerModelgpt-5.5-proOpenAI
OpenAI API lists gpt-5.5-pro at $15 in / $90 out per 1M tokens
openrouter
openrouter.ai
11 Sept 2026
Listed by providerModelgpt-5.5-proOpenAI
OpenAI API lists gpt-5.5-pro at $30 in / $180 out per 1M tokens
openrouter
openrouter.ai
11 Sept 2026
New modelModelgpt-5.5-proOpenAI
New model: gpt-5.5-pro (OpenAI)
openai
developers.openai.com
11 Sept 2026
Listed by providerModelgpt-5.5-proOpenAI
OpenAI API lists gpt-5.5-pro at $30 in / $180 out per 1M tokens
openai
developers.openai.com

Change history20

Temporal, append-only claims: a new observation closes the previous claim instead of overwriting it. Rewind the record with the as-of picker.

Viewing AI Atlas as of 12 Sept 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.

Back to today →

Attributes as of 12 Sept 2026 23 claims in force

Release date: 24 Apr 2026
Openness: proprietary
Context window: 1.05M tokens
Max output: 128K tokens
Knowledge cutoff: Dec 2025
Modalities: document, image, text
Input modalities: document, image, text
Output modalities: text
Tokenizer: GPT
API model id: gpt-5.5-pro
Official page: developers.openai.com/api/docs/models/gpt-5.5-pro
Aa context window: 922,000
Aa openness: proprietary
File input: Yes
Openrouter id: openai/gpt-5.5-pro
Openrouter listed at: 24 Apr 2026
Reasoning: Yes
Structured output: Yes
Supported parameters: include_reasoning, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools
Tool calling: Yes
Vision: Yes
Weights available: No

20 claims · 19 properties

Release daterelease_date1

Claim history for Release date
Value	Valid from → to	Status	Source	Confidence	Extractor
24 Apr 2026	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Opennessopenness1

Claim history for Openness
Value	Valid from → to	Status	Source	Confidence	Extractor
proprietary	11 Sept 2026 20:51 UTC → current	current	OpenAI Platform docsT1	high	deterministic

Context windowcontext_length2

Claim history for Context window
Value	Valid from → to	Status	Source	Confidence	Extractor
922K tokens	11 Sept 2026 22:42 UTC → current	current	Artificial AnalysisT2	medium	deterministic
1.05M tokens	11 Sept 2026 21:10 UTC → 11 Sept 2026 22:42 UTC	superseded	OpenRouter public model & pricing listingT2	medium	deterministic

Max outputmax_output_tokens1

Claim history for Max output
Value	Valid from → to	Status	Source	Confidence	Extractor
128K tokens	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Knowledge cutoffknowledge_cutoff1

Claim history for Knowledge cutoff
Value	Valid from → to	Status	Source	Confidence	Extractor
Dec 2025	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Modalitiesmodalities1

Claim history for Modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
image, text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Input modalitiesmodalities_input1

Claim history for Input modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
image, text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Output modalitiesmodalities_output1

Claim history for Output modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Tokenizertokenizer1

Claim history for Tokenizer
Value	Valid from → to	Status	Source	Confidence	Extractor
GPT	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

API model idapi_model_id1

Claim history for API model id
Value	Valid from → to	Status	Source	Confidence	Extractor
gpt-5.5-pro	11 Sept 2026 20:51 UTC → current	current	OpenAI Platform docsT1	high	deterministic

Official pageofficial_url1

Claim history for Official page
Value	Valid from → to	Status	Source	Confidence	Extractor
https://developers.openai.com/api/docs/models/gpt-5.5-pro	11 Sept 2026 20:51 UTC → current	current	OpenAI Platform docsT1	high	deterministic

Descriptiondescription1

Claim history for Description
Value	Valid from → to	Status	Source	Confidence	Extractor
Version of GPT-5.5 that produces smarter and more precise responses.	11 Sept 2026 20:51 UTC → current	current	OpenAI Platform docsT1	high	deterministic

File inputfile_input1

Claim history for File input
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Openrouter idopenrouter_id1

Claim history for Openrouter id
Value	Valid from → to	Status	Source	Confidence	Extractor
openai/gpt-5.5-pro	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Reasoningreasoning1

Claim history for Reasoning
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Structured outputstructured_output1

Claim history for Structured output
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Supported parameterssupported_parameters1

Claim history for Supported parameters
Value	Valid from → to	Status	Source	Confidence	Extractor
include_reasoning, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Tool callingtool_calling1

Claim history for Tool calling
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Visionvision1

Claim history for Vision
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →

Provenance

Attributed facts

Source tiers

T1T24 / 16

Freshest observation

5 h ago

Conflicts

None

Source documents 4

Source documents
Source	Document	Type	Tier	Last observed	Snapshots
OpenAI Platform docs	developers.openai.com/api/docs/pricing.md	pricing	T1· Official	3 h ago	2
OpenAI Platform docs	developers.openai.com/api/docs/models.md	model_docs	T1· Official	3 h ago	1
OpenRouter public model & pricing listing	openrouter.ai/api/v1/models	catalogue	T2· Quality secondary	3 h ago	7
Artificial Analysis	artificialanalysis.ai/leaderboards/models	leaderboard	T2· Quality secondary	10 h ago	1

Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.

Data quality (64/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →