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GPT-5.5

by OpenAI · Released Apr 2026

65.7
avg score
Rank #55
Compare
Better than 82% of all models
Context
400K tokens (~200 books)
Input $/1M
$5.00
Output $/1M
$30.00
Type
text
License
Proprietary
Benchmarks
6 tested
Data as of
About

OpenAI's smartest model · GPT-5.5. Same speed as GPT-5.4. Plans, uses tools, checks its own work. Tops Terminal-Bench 2.0 (82.7%), GDPval (84.9%), ARC-AGI-2 (85.0%), CyberGym (81.8%). SOTA on AA Coding Index at half the cost.

Tested on 6 benchmarks · BenchGecko score 65.7. Top scores: ARC-AGI (95.0%), GPQA diamond (93.6%), browsecomp (84.4%).

Looking for similar performance at lower cost?
Gemini 3.7 Flash scores 66.4 (101% as good) at $0.75/1M input · 85% cheaper
Capabilities
coding
82.7
#5 globally
reasoning
95.0
#3 globally
knowledge
93.6
#2 globally
agentic
78.7
#2 globally
other
79.8
#2 globally
Benchmark Scores
Compare All
Tested on 6 benchmarks · Ranked across 5 categories
Score Distribution (all 312 models)
0255075100
▲ You are here
codingCompare coding →
Terminal Bench

Complex terminal-based engineering tasks. Models must use command-line tools, navigate filesystems, and debug systems through shell interaction.

82.7·
reasoningCompare reasoning →
ARC-AGI

Abstraction and Reasoning Corpus. Tests fluid intelligence through novel visual pattern recognition puzzles. Core measure of general intelligence.

95.0·
knowledgeCompare knowledge →
GPQA diamond

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

93.6·
Quick compare:Anthropic logovs Claude Opus 4.7OpenAI logovs GPT-5.4xAI logovs Grok 4.6
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 added
Apr 25, 2026
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Links
Info
OpenAIPricing explorerDevelopers · API
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@OpenAI
BenchGecko API
gpt-5-5
Specifications
  • Typetext
  • Context400K tokens (~200 books)
  • ReleasedApr 2026
  • LicenseProprietary
  • StatusActive
  • Cost / Message~$0.040
Available On
OpenAI logoOpenAI$5.00
Categories
codingreasoningknowledgeagenticother
Learn More
context-windowtransformertokens
Share & Export
Tweet
Related Models
Anthropic logoClaude Opus 4.7
65.6
OpenAI logoGPT-5.4
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xAI logoGrok 4.6
66.2
Anthropic logoClaude Sonnet 5
66.3
GPT-5.5 is a proprietary text AI model by OpenAI, released in April 2026. It has an average benchmark score of 65.7. Context window: 400K tokens.

Related Models

Claude Opus 4.7 · AnthropicGPT-5.4 · OpenAIGrok 4.6 · xAIClaude Sonnet 5 · AnthropicGemini 3.1 Pro Preview · Google DeepMind

Benchmarks

ARC-AGIGPQA diamondbrowsecompTerminal BenchOSWorld

Related Pages

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

Key facts · as of 2026-10-05

  • GPT-5.5 by OpenAI. BenchGecko score 65.7, rank 55 of 312 scored models (normalized average of public benchmark scores).
  • List price $5.00 input · $30.00 output per 1M tokens (as of 2026-10-05).
  • Sold by 7 providers (as of 2026-10-05): OpenAI $2.50 in / $15.00 out · Azure $5.00 in / $30.00 out · OpenAI $5.00 in / $30.00 out · Amazon Bedrock $5.50 in / $33.00 out · Azure $5.50 in / $33.00 out · and 2 more. Every provider

How to cite · data as of 2026-10-05

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

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