GPT-5.5 — Benchmarks, Capabilities, and Use Cases
GPT-5.5 is a proprietary AI model from OpenAI, classified as Frontier tier with a 1M tokens context window. It is available directly in FlowHunt. Explore benchm...
4 min read
GPT-5.4 is a top-tier frontier AI model, developed by OpenAI and released in March 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.
On the FlowHunt AI Leaderboard it is one of 24 tracked models, evaluated across 1 benchmark. Standout scores: 59.1% on SWE-bench Pro (#5 of 9).
GPT-5.4 was released on March 5, 2026 as an intermediate update between GPT-5 and GPT-5.5. OpenAI provided limited public benchmark data at launch, but the AA Intelligence Index independently measured it at 56.8 points, placing it clearly in the Frontier tier. GPT-5.4 focused primarily on improving instruction following, structured output reliability, and multi-turn context coherence rather than raw benchmark performance. It served as the bridge release while OpenAI prepared the more substantially improved GPT-5.5, and maintained full API backwards-compatibility with GPT-5.
Note: Built-in computer use. 33% fewer factual errors than 5.2. OSWorld 75%.
- Released
- March 2026
- Context
- 1M tokens
- Weights
- Closed
- Tier
- Frontier
- Provider
- OpenAI
GPT-5.4 Benchmark Rankings
Rank among all 24 models tracked on this leaderboard. SR = self-reported · 3P / AA / C = independently verified.
| Benchmark | Score | Rank | Source | What it measures |
|---|---|---|---|---|
| SWE-bench Pro | 59.1% | 5 of 9 | 3P | Multi-language, standardised scaffold |
Detailed Benchmark Scores
SWE-Pro
3P
59.1%
Multi-language, standardised scaffold
GPT-5.4 vs. Frontier Peers
Head-to-head benchmark comparison with other Frontier-tier models. Higher is better for all metrics.
| Benchmark | GPT-5.4 | Claude Opus 4.8 | Claude Opus 4.7 |
|---|---|---|---|
| SWE-Pro | 59.1% | 69.2% | 64.3% |
About OpenAI
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-5.5), 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.
Use Cases
What to Use GPT-5.4 For
- Long-Document & Codebase Analysis
With a 1M-token context window, GPT-5.4 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 & Limitations
Strengths
- Very long documents and large codebases (1M context)
Limitations
- Closed-weight — cannot be self-hosted or fine-tuned on private data
Browse the Full AI Model Leaderboard
Compare all 24 models across 11 benchmarks — sortable, sourced, and updated June 2026.
Frequently asked questions
Learn more
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