OpenAI Frontier Available in FlowHunt

GPT-5.5

GPT-5.5 is a top-tier frontier AI model, developed by OpenAI and released in April 2026. It is a proprietary closed-weight model, available through the OpenAI API. The 1M-token context window is large enough to hold entire codebases, lengthy technical documents, or extended agentic sessions without truncation.

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GPT-5.5 was released by OpenAI on April 23, 2026 as an iterative refinement of GPT-5. OpenAI positioned GPT-5.5 as the primary general-purpose model in its API, and it became the default model powering ChatGPT for most users.
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Benchmarks

Each score appears once, with its rank among tracked models and who measured it.

Compared with Frontier peers on the same scale
  • GPT-5.5this model
  • Claude Opus 5.5this model leads on 0 of 6
  • Grok 4.7this model leads on 2 of 5
Verified independent evaluator, counted in the ranking Self-reported published by OpenAI, shown but not ranked
Overall

AA Intelligence Index

Independent composite of agent, coding, knowledge and science tests by Artificial Analysis (v4).

Source ↗

GPT-5.5 38.4 Claude Opus 5.5 57.6 Grok 4.7 46.4
#21of 45 Verified
Coding

DeepSWE

113 long-horizon software tasks written from scratch, graded by hidden tests.

Source ↗

GPT-5.5 67.0% Claude Opus 5.5 74.2% Grok 4.7 71.0%
#8of 17 Verified

SWE-bench Pro

Real issues across several languages and large codebases.

GPT-5.5 58.6% Claude Opus 5.5 89.9% Grok 4.7 No score
Not ranked Self-reported

SWE-bench Verified

500 verified GitHub issues. Saturated at the frontier.

Source ↗Also: Self-reported 88.7%

GPT-5.5 82.6% Claude Opus 5.5 No score Grok 4.7 No score
#9of 22 Verified
Agents

Terminal-Bench 4.0

Multi-step professional tasks done by an agent in a command-line terminal.

Source ↗

GPT-5.5 14.6% Claude Opus 5.5 59.6% Grok 4.7 25.8%
#19of 36 Verified
Reasoning

Humanity's Last Exam

Expert-written questions across 100+ subjects, no tools.

Source ↗

GPT-5.5 45.8% Claude Opus 5.5 61.4% Grok 4.7 43.1%
#14of 44 Verified

GPQA Diamond

Graduate-level science questions that search cannot answer.

Source ↗Also: Self-reported 93.6%

GPT-5.5 93.5% Claude Opus 5.5 No score Grok 4.7 No score
#6of 37 Verified

ARC-AGI-2

Novel visual puzzles that cannot be memorised.

Source ↗

GPT-5.5 85.0% Claude Opus 5.5 93.3% Grok 4.7 61.4%
#9of 27 Verified

What to Use GPT-5.5 For

Software Engineering

It resolves real GitHub issues, writes production-quality code across multiple languages, and handles multi-step agentic coding workflows — a strong choice for AI-assisted software development teams.

Scientific & Technical Reasoning

Use it for scientific literature synthesis, hypothesis evaluation, medical and legal Q&A, and multi-discipline research tasks where deep domain knowledge matters.

Agentic CLI Automation

Terminal-Bench measures autonomous completion of Linux shell tasks — package management, file system operations, process control, and multi-step system administration — without human guidance mid-task.

Long-Document & Codebase Analysis

With a 1M-token context window, GPT-5.5 can ingest entire software repositories, long legal contracts, book-length research reports, or extensive conversation histories in a single prompt — enabling deep document Q&A, cross-file codebase reasoning, and comprehensive summarisation without chunking heuristics or RAG pipelines.

Strengths and limitations

Strengths

  • Strong software engineering
  • Graduate-level science reasoning
  • Agentic Linux / CLI automation
  • Composite intelligence
  • Very long documents and large codebases (1M context)

Limitations

  • Closed-weight — cannot be self-hosted or fine-tuned on private data

Use it in FlowHunt

Use GPT-5.5 in any flow, next to your own tools and knowledge sources.

  1. 1Open a flow, or create one from a template
  2. 2Add an AI Agent or Generator component
  3. 3Pick GPT-5.5 in the model selector

Related AI Models

About OpenAI San Francisco, CA · Founded 2015 · openai.com

OpenAI was founded in December 2015 as a nonprofit AI research laboratory by Sam Altman, Elon Musk, Greg Brockman, Ilya Sutskever, John Schulman, and Wojciech Zaremba, with the mission of developing artificial general intelligence (AGI) that benefits all of humanity. In 2019 it created a capped-profit subsidiary, OpenAI LP, to raise institutional capital and scale model training. The company is known for the GPT series of language models (GPT-1 through GPT-6.1), the DALL-E image generation series, Whisper speech recognition, and Sora video generation. OpenAI operates the ChatGPT consumer application, a developer API, and enterprise services through Microsoft Azure. As of 2026 it maintains a close strategic partnership with Microsoft, which is the company's largest investor and cloud provider.

openai.com ↗

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Compare every tracked model on coding, agent and reasoning benchmarks, with each score marked verified or self-reported.

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Frequently asked questions

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