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ModelActiveClosed / proprietaryIdentity probable

gpt-5.5-pro

OpenAIfamily · GPT 5.5developers.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 quality71

Updated 3 h ago · first seen 11 Sept 2026

model_01M293V774W1B45EE968ACSQ4T

Overview

Identity

Canonical model
Yesidentity confidence: mediumOne row per real model release. Artifacts (checkpoints, quantisations, conversions) and folded evaluation variants point here.
Official checkpoints
None recorded — closed weightsofficial_checkpoints = hf_repo identifiers carried by the model itself; artifacts are separate entities pointing here through canonical_id.
Artifacts
None recordedSeparate entities (checkpoint · quantization · conversion · packaging) pointing to this model through canonical_id.
Provider deployments
2
API aliases
gpt-5-5-progpt-5.5-proopenai/gpt-5.5-proIdentifiers under which providers and evaluators refer to this model.
Folded evaluation variants
0Effort / thinking variants (…-high, …-non-reasoning) are result configurations of this model, not separate models. Their old URLs redirect here.

Openness

Closed / proprietary— weights not available; 7 dimensions unknown.

Weights are not available; the model is reachable only through an API or a product.

  • Weights

    No

  • Inference code

    —

  • Training code

    —

  • Training data

    —

  • Dataset

    —

  • Commercial use

    —

  • Redistribution

    —

  • Derivatives

    —

dimensions marked null are unknown, not false

Key facts

Release date

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Official page
developers.openai.com/api/docs/models/gpt-5.5-pro

Source:OpenAI Platform docsT1observed 14 h agohigh

API model id

Source:OpenAI Platform docsT1observed 14 h agohigh

Openrouter id

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Architecture

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Capabilities

Modalities

Modalities
documentimagetext
Input
documentimagetext
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 10 h agomedium

Max output

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Providers & Pricing5

All offers in the price terminal →
Provider deployments, cheapest output first
ProviderContextInput / 1MOutput / 1MBatch in / outNative unitsStatusObservedSource
OpenAI APIcheapest outputopenai/gpt-5.5-pro:batch1.05Mout 128K——active4 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-5.5-pro:batch1.05Mout 128K——active1 h agosince 12 Sept 2026openrouter.aiT2
OpenAI APIgpt-5.5-pro—$15 / $90flex_input_per_mtok=15flex_output_per_mtok=90long_context_input_per_mtok=60+1active5 h agosince 11 Sept 2026developers.openai.comT1
OpenAI APIopenai/gpt-5.5-pro1.05Mout 128K——active4 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-5.5-pro1.05Mout 128K——active1 h agosince 12 Sept 2026openrouter.aiT2

USD per 1M tokens as published by each provider; native units (per-request fees, flex/priority tiers) are kept verbatim. Rows are append-only — every price change is kept in the history below. Cost of a workload →

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 2 providers

Output price history of gpt-5.5-pro$0$50$100$150$200$250Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $180 · 11 Sept 2026OpenAI API: $180 → $90 · 11 Sept 2026OpenRouter: first observed → $180 · 12 Sept 2026OpenRouter: $180 → $90 · 12 Sept 2026
  • OpenAI API
  • OpenRouter
  • OpenRouter$180 → $9012 Sept 2026
  • OpenRouterfirst observed $18012 Sept 2026
  • OpenAI API$180 → $9011 Sept 2026
  • OpenAI APIfirst observed $18011 Sept 2026

Input price · USD / 1M tokens 2 providers

Input price history of gpt-5.5-pro$0$10$20$30$40Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $30 · 11 Sept 2026OpenAI API: $30 → $15 · 11 Sept 2026OpenRouter: first observed → $30 · 12 Sept 2026OpenRouter: $30 → $15 · 12 Sept 2026
  • OpenAI API
  • OpenRouter
  • OpenRouter$30 → $1512 Sept 2026
  • OpenRouterfirst observed $3012 Sept 2026
  • OpenAI API$30 → $1511 Sept 2026
  • OpenAI APIfirst observed $3011 Sept 2026

Versions & Artifacts0

Version history

Context window2 changes

11 Sept 2026→11 Sept 2026→12 Sept 2026current

Knowledge cutofffirst observation only

11 Sept 2026current

Max outputfirst observation only

11 Sept 2026current

Opennessfirst observation only

11 Sept 2026current

Each hop is a claim: click a value for its source, tier and observation time. Nothing is overwritten — a new observation closes the previous claim.

Artifacts 0

No artifact (checkpoint, quantisation, conversion or packaging) points to this model yet.

Timeline5

Full timeline →
  • Listed by providerModelgpt-5.5-proOpenAI

    OpenRouter lists gpt-5.5-pro at $15 in / $90 out per 1M tokens

    openrouter
    openrouter.ai
  • Listed by providerModelgpt-5.5-proOpenAI

    OpenRouter lists gpt-5.5-pro at $30 in / $180 out per 1M tokens

    openrouter
    openrouter.ai
  • Capabilities changedModelgpt-5.5-proOpenAI

    gpt-5.5-pro: modalities changed from ["image", "text"] to ["document", "image", "text"]

    Modalitiesimage, text→document, image, textopenrouter
    openrouter.ai
  • Property changedModelgpt-5.5-proOpenAI

    gpt-5.5-pro: modalities input changed from ["image", "text"] to ["document", "image", "text"]

    Input modalitiesimage, text→document, image, textopenrouter
    openrouter.ai
  • 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

Change history

Temporal, append-only claims: a new observation closes the previous claim instead of overwriting it. Rewind the record with the as-of picker.
1 claims · 1 propertiesShow all properties

Aa context windowaa_context_window1

Claim history for Aa context window
ValueValid from → toStatusSourceConfidenceExtractor
922,000 tokens → currentcurrentArtificial AnalysisT2mediumdeterministic

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

24

Source tiers

T1T24 / 20

Freshest observation

3 h ago

Conflicts

None

Source documents 4

Source documents
SourceDocumentTypeTierLast observedSnapshots
OpenAI Platform docsdevelopers.openai.com/api/docs/pricing.md pricingT1· Official1 h ago2
OpenAI Platform docsdevelopers.openai.com/api/docs/models.md model_docsT1· Official1 h ago1
OpenRouter public model & pricing listingopenrouter.ai/api/v1/models catalogueT2· Quality secondary1 h ago10
Artificial Analysisartificialanalysis.ai/leaderboards/models leaderboardT2· Quality secondary3 h ago2

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

Data quality (71/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →