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ModelDeprecated

gpt-5.5

OpenAIdevelopers.openai.com/api/docs/models/gpt-5.5

A new class of intelligence for coding and professional work.

Open in Graph
data quality67

Updated 5 h ago · first seen 11 Sept 2026

model_01M293V772N044XPFJB1GZKCY8

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

Status

Source:Artificial AnalysisT2observed 10 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 12 h agomedium

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

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

Benchmarks18

Compare with another model →

Comparable same task and conditions · Partially comparable same task, conditions differ (effort, temperature, judge) · Not comparable different variant or metric

No benchmark results recorded

Results appear when a tier 1–3 source publishes them; we never copy scores without a source.

Providers & Pricing3

All offers in the price terminal →
Current prices per 1M tokens
ProviderInput / 1MOutput / 1MCached inBatch in / outContextObservedSource
OpenAI APIopenai/gpt-5.5:batch$2.5$15$0.25—1.05M4 h agoopenrouter.aiT2
OpenAI APIgpt-5.5$5$30$0.50$2.5 / $15—4 h agodevelopers.openai.comT1
OpenAI APIopenai/gpt-5.5$5$30$0.50—1.05M4 h agoopenrouter.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

Output price history of gpt-5.5$0$10$20$30$40Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $30 · 11 Sept 2026OpenAI API: $30 → $15 · 11 Sept 2026
  • OpenAI API
  • OpenAI API$30 → $1511 Sept 2026
  • OpenAI APIfirst observed $3011 Sept 2026

Input price · USD / 1M tokens 1 provider

Input price history of gpt-5.5$0$2$4$6Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $5 · 11 Sept 2026OpenAI API: $5 → $2.5 · 11 Sept 2026
  • OpenAI API
  • OpenAI API$5 → $2.511 Sept 2026
  • OpenAI APIfirst observed $511 Sept 2026

Timeline24

Full timeline →
  • Context window changedModelgpt-5.5OpenAI

    gpt-5.5: context length changed from 922000 to 1050000

    Context window922K tokens→1.05M tokensopenrouter
    openrouter.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 70.729% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 87.363% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 81.576% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 95.857% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 53.99% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 82.149% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 89.654% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 80.188% on LiveBench

    livebench_leaderboard
    livebench.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 60.61% on Terminal-Bench

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 84.27% on Terminal-Bench

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 14.65% on Terminal-Bench

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 93.86% on τ²-bench

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 79.88% on MMMU-Pro

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 75.85% on IFBench

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 55.79% on SciCode

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 45.78% on Humanity's Last Exam

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 93.54% on GPQA

    artificial_analysis
    artificialanalysis.ai
  • Benchmark resultModelgpt-5.5OpenAI

    gpt-5.5 scores 38.63 on Artificial Analysis Intelligence Index

    artificial_analysis
    artificialanalysis.ai
  • Context window changedModelgpt-5.5OpenAI

    gpt-5.5: context length changed from 1050000 to 922000

    Context window1.05M tokens→922K tokensartificial_analysis
    artificialanalysis.ai
  • Listed by providerModelgpt-5.5OpenAI

    OpenAI API lists gpt-5.5 at $2.5 in / $15 out per 1M tokens

    openrouter
    openrouter.ai
  • Listed by providerModelgpt-5.5OpenAI

    OpenAI API lists gpt-5.5 at $5 in / $30 out per 1M tokens

    openrouter
    openrouter.ai
  • New modelModelgpt-5.5OpenAI

    New model: gpt-5.5 (OpenAI)

    openai
    developers.openai.com
  • Listed by providerModelgpt-5.5OpenAI

    OpenAI API lists gpt-5.5 at $5 in / $30 out per 1M tokens

    openai
    developers.openai.com

Change history19

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 25 claims in force

Release date
24 Apr 2026
Status
deprecated
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
Aa context window
922,000
Aa openness
proprietary
File input
Yes
Aa median output tokens per second
80.5
Openrouter id
openai/gpt-5.5
Openrouter listed at
24 Apr 2026
Reasoning
Yes
Structured output
Yes
Supported parameters
include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools
Tool calling
Yes
Vision
Yes
Weights available
No
19 claims · 19 properties

Release daterelease_date1

Claim history for Release date
ValueValid from → toStatusSourceConfidenceExtractor
24 Apr 2026 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Opennessopenness1

Claim history for Openness
ValueValid from → toStatusSourceConfidenceExtractor
proprietary → currentcurrentOpenAI Platform docsT1highdeterministic

Context windowcontext_length1

Claim history for Context window
ValueValid from → toStatusSourceConfidenceExtractor
1.05M tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Max outputmax_output_tokens1

Claim history for Max output
ValueValid from → toStatusSourceConfidenceExtractor
128K tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Knowledge cutoffknowledge_cutoff1

Claim history for Knowledge cutoff
ValueValid from → toStatusSourceConfidenceExtractor
Dec 2025 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Modalitiesmodalities1

Claim history for Modalities
ValueValid from → toStatusSourceConfidenceExtractor
image, text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Input modalitiesmodalities_input1

Claim history for Input modalities
ValueValid from → toStatusSourceConfidenceExtractor
image, text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Output modalitiesmodalities_output1

Claim history for Output modalities
ValueValid from → toStatusSourceConfidenceExtractor
text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tokenizertokenizer1

Claim history for Tokenizer
ValueValid from → toStatusSourceConfidenceExtractor
GPT → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

API model idapi_model_id1

Claim history for API model id
ValueValid from → toStatusSourceConfidenceExtractor
gpt-5.5 → currentcurrentOpenAI Platform docsT1highdeterministic

Official pageofficial_url1

Claim history for Official page
ValueValid from → toStatusSourceConfidenceExtractor
https://developers.openai.com/api/docs/models/gpt-5.5 → currentcurrentOpenAI Platform docsT1highdeterministic

Descriptiondescription1

Claim history for Description
ValueValid from → toStatusSourceConfidenceExtractor
A new class of intelligence for coding and professional work. → currentcurrentOpenAI Platform docsT1highdeterministic

File inputfile_input1

Claim history for File input
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Openrouter idopenrouter_id1

Claim history for Openrouter id
ValueValid from → toStatusSourceConfidenceExtractor
openai/gpt-5.5 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Reasoningreasoning1

Claim history for Reasoning
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Structured outputstructured_output1

Claim history for Structured output
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Supported parameterssupported_parameters1

Claim history for Supported parameters
ValueValid from → toStatusSourceConfidenceExtractor
include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tool callingtool_calling1

Claim history for Tool calling
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Visionvision1

Claim history for Vision
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

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

22

Source tiers

T1T24 / 18

Freshest observation

5 h ago

Conflicts

None

Source documents 5

Source documents
SourceDocumentTypeTierLast observedSnapshots
OpenAI Platform docsdevelopers.openai.com/api/docs/pricing.md pricingT1· Official4 h ago2
OpenAI Platform docsdevelopers.openai.com/api/docs/models.md model_docsT1· Official4 h ago1
OpenRouter public model & pricing listingopenrouter.ai/api/v1/models catalogueT2· Quality secondary4 h ago6
LiveBenchlivebench.ai/table_2026_06_25.csv leaderboardT2· Quality secondary10 h ago1
Artificial Analysisartificialanalysis.ai/leaderboards/models leaderboardT2· Quality secondary10 h ago1

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

Data quality (67/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →