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GPT-5.5 Pro

openai/gpt-5.5-pro

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

Source-linkedgpt-proClosed weightsReleased 2026-04-23
Report data
Context window1.05M
Maximum output128K
Provider offers11
Knowledge cutoff2025-12-01
Capabilities

What this model supports

ReasoningYes
Tool callingYes
Structured outputYes
AttachmentsYes
Temperature controlNo
Open weightsNo
Creator
OpenAI
Family
gpt-pro
Modalities
Image, Pdf, Text
License
Not documented
Release date
2026-04-23
Model ID
openai/gpt-5.5-pro
Market availability

Provider pricing

Report price →
Providers offering GPT-5.5 Pro
ProviderProvider model IDContextInput / 1MOutput / 1MCached / 1MFeaturesAll pricing
Poeopenai/gpt-5.5-pro400K$27.273$163.636R T ·
View
{
  "input": 27.2727,
  "output": 163.6364
}
ZenMuxopenai/gpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "context_over_200k": {
    "input": 60,
    "output": 270
  },
  "input": 30,
  "output": 180,
  "tiers": [
    {
      "input": 60,
      "output": 270,
      "tier": {
        "size": 272000,
        "type": "context"
      }
    }
  ]
}
OpenAIgpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "context_over_200k": {
    "input": 60,
    "output": 270
  },
  "input": 30,
  "output": 180,
  "tiers": [
    {
      "input": 60,
      "output": 270,
      "tier": {
        "size": 272000,
        "type": "context"
      }
    }
  ]
}
OrcaRouteropenai/gpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "context_over_200k": {
    "input": 60,
    "output": 270
  },
  "input": 30,
  "output": 180,
  "tiers": [
    {
      "input": 60,
      "output": 270,
      "tier": {
        "size": 272000,
        "type": "context"
      }
    }
  ]
}
LLM Gatewaygpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "context_over_200k": {
    "input": 60,
    "output": 270
  },
  "input": 30,
  "output": 180,
  "tiers": [
    {
      "input": 60,
      "output": 270,
      "tier": {
        "size": 272000,
        "type": "context"
      }
    }
  ]
}
OpenCode Zengpt-5.5-pro1.05M$30.000$180.000$30.000R T ·
View
{
  "cache_read": 30,
  "input": 30,
  "output": 180
}
Kilo Gatewayopenai/gpt-5.5-pro1.05M$30.000$180.000R T ·
View
{
  "input": 30,
  "output": 180
}
OpenRouteropenai/gpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "input": 30,
  "output": 180
}
FastRouteropenai/gpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "input": 30,
  "output": 180
}
CrossModelopenai/gpt-5.5-pro1.05M$30.000$180.000R T S
View
{
  "context_over_200k": {
    "input": 60,
    "output": 270
  },
  "input": 30,
  "output": 180,
  "tiers": [
    {
      "input": 60,
      "output": 270,
      "tier": {
        "size": 272000,
        "type": "context"
      }
    }
  ]
}
Vercel AI Gatewayopenai/gpt-5.5-pro1M$30.000$180.000R T S
View
{
  "input": 30,
  "output": 180
}
Evidence

Published benchmark results

BrowseComp vs top 7 models
GPT-5.6 Sol
90.4
GPT-5.5 Pro
90.1
GPT-5.4 Pro
89.3
GPT-5.6 Terra
87.5
Claude Sonnet 5
84.7
GPT-5.5
84.4
MiniMax-M3
83.5
FrontierMath vs top 7 models
GPT-5.6 Sol
89.0
GPT-5.6 Terra
84.9
GPT-5.6 Luna
78.6
GPT-5.5 Pro
39.6
GPT-5.4 Pro
38.0
GPT-5.5
35.4
GPT-5.4
27.1
GDPval vs top 6 models
GPT-5.5
84.9
GPT-5.4
83.0
GPT-5.5 Pro
82.3
GPT-5.4 Pro
82.0
Nemotron 3 Ultra 550B A55B
46.7
Step 3.7 Flash
45.8
GeneBench vs top 2 models
GPT-5.5 Pro
33.2
GPT-5.4 Pro
25.6
Humanity's Last Exam vs top 7 models
Claude Fable 5
64.5
Muse Spark 1.1
62.1
GPT-5.4 Pro
58.7
Claude Opus 4.8
57.9
GPT-5.5 Pro
57.2
Claude Opus 4.7
54.7
GPT-5.5
52.2