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.
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GPT-5.4 was released on March 5, 2026 as an intermediate update between GPT-5 and GPT-5.5. 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.
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 and limitations
Strengths
+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-5.4 in any flow, next to your own tools and knowledge sources.
About OpenAISan 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.
GPT-5.4 is a top-tier frontier AI model, developed by OpenAI and released in March 2026. It handles general AI tasks including writing, analysis, summarisation, and question answering.
GPT-5.4 is a proprietary closed-weight model. Its weights are not publicly available — access is through the OpenAI API only.
GPT-5.4 supports a 1M-token context window, large enough to hold entire codebases, lengthy technical documents, or extended agentic sessions without truncation.
Yes — GPT-5.4 is directly available in FlowHunt. You can use it to build AI agents, automated workflows, chatbots, and document processing pipelines without any additional setup.
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