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GPT-5.5 Pro

by OpenAI · Released Apr 2026

99.9
avg score
Rank #1
Compare
#1 ranked model today
Context
400K tokens (~200 books)
Input $/1M
$30.00
Output $/1M
$180.00
Type
text
License
Proprietary
Benchmarks
3 tested
Data as of
About

GPT-5.5 Pro · OpenAI's highest-capability tier. Tops BrowseComp (90.1%), FrontierMath T1-3 (52.4%), GPQA Diamond (94.2%). $30/$180 per 1M tokens.

Tested on 3 benchmarks · BenchGecko score 99.9. Top scores: GPQA diamond (94.2%), browsecomp (90.1%), mcp-atlas (79.1%).

Looking for similar performance at lower cost?
Step 3.5 Flash scores 89.5 (90% as good) at $0.10/1M input · 100% cheaper
Capabilities
knowledge
94.2
#1 globally
other
84.6
#1 globally
Benchmark Scores
Compare All
Tested on 3 benchmarks · Ranked across 2 categories
Score Distribution (all 312 models)
0255075100
▲ You are here
knowledgeCompare knowledge →
GPQA diamond

Graduate-level science questions written by PhD experts. Diamond subset contains questions where experts disagree, testing deep understanding.

94.2·
otherCompare other →
browsecomp
90.1·
mcp-atlas
79.1·
Quick compare:Anthropic logovs Claude Mythos PreviewAnthropic logovs Claude Opus 5.5OpenAI logovs GPT-6 Astra
Excellent (85+) Good (70-85) Average (50-70) Below (<50)
Model Family · OpenAI GPT-5.5
Apr 2026
65.7
$5.00/M in400Kctx6 benchmarks
Apr 2026
$2.50/M in(-2.50)1.1Mctx(+650K)
Apr 2026
99.9+34.2
$30.00/M in(+27.50)400Kctx(-650K)3 benchmarks
Apr 2026
$15.00/M in(-15)1.1Mctx(+650K)
See the full GPT-5.5 family →
Recently Happened
GPT-5.5 Pro added
Apr 25, 2026
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Links
Info
OpenAIPricing explorerDevelopers · API
Research
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Community
@OpenAI
BenchGecko API
gpt-5-5-pro
Specifications
  • Typetext
  • Context400K tokens (~200 books)
  • ReleasedApr 2026
  • LicenseProprietary
  • StatusActive
  • Cost / Message~$0.240
Available On
OpenAI logoOpenAI$30.00
Categories
knowledgeother
Learn More
context-windowtransformertokens
Share & Export
Tweet
Related Models
Anthropic logoClaude Mythos Preview
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Anthropic logoClaude Opus 5.5
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OpenAI logoGPT-6 Astra
96.3
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95.2
GPT-5.5 Pro is a proprietary text AI model by OpenAI, released in April 2026. It has an average benchmark score of 99.9. Context window: 400K tokens.

Related Models

Claude Mythos Preview · AnthropicClaude Opus 5.5 · AnthropicGPT-6 Astra · OpenAIDeepSeek V3.2 Speciale · DeepSeekStep 3.5 Flash · stepfun

Benchmarks

GPQA diamondbrowsecompmcp-atlas

Related Pages

OpenAI · ProviderOpenAI · EconomyAll ModelsCompare ModelsPricingDevelopers · APIContext Window · Glossary

Key facts · as of 2026-10-05

  • GPT-5.5 Pro by OpenAI. BenchGecko score 99.9, rank 1 of 312 scored models (normalized average of public benchmark scores).
  • List price $30.00 input · $180.00 output per 1M tokens (as of 2026-10-05).
  • Sold by 2 providers (as of 2026-10-05): OpenAI $15.00 in / $90.00 out · OpenAI $30.00 in / $180.00 out. Every provider

How to cite · data as of 2026-10-05

GPT-5.5 Pro · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/gpt-5-5-pro

Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP