Introducing GPT-5.5
New model hits 95% accuracy on benchmarks, processes 2M tokens at once
OpenAI officially launched GPT-5.5, a major iterative upgrade to its GPT-5 model, now available via API and ChatGPT Plus. The model features a 2 million token context window, enabling users to process entire codebases, lengthy legal documents, or multi-hour video transcripts in a single request. Inference speed has tripled compared to GPT-5, while API pricing drops by 50%, making it one of the most cost-effective high-performance models on the market. On internal benchmarks, GPT-5.5 scores 95% on advanced math (MATH-500), 92% on coding (HumanEval), and 89% on multilingual reasoning (MMLU-Pro), surpassing GPT-5 by 5–10 percentage points in each category.
Key improvements include a new sparse attention mechanism that reduces memory usage by 60% during long-context processing, and a refined instruction-following system that cuts hallucination rates by 40%. OpenAI also introduced a new "Agent Mode" for the API, allowing GPT-5.5 to autonomously execute multi-step tasks like web scraping, database queries, and API calls with built-in error handling. Early adopters report 70% faster document summarization and 80% fewer API call failures for complex workflows. The model is available immediately, with a free tier for ChatGPT users (limited to 10 messages per hour) and paid plans starting at $20/month for unlimited access.
- GPT-5.5 handles 2M tokens per context window, 3x faster inference than GPT-5
- API costs reduced by 50%, with 95% accuracy on MATH-500 and HumanEval benchmarks
- New sparse attention mechanism cuts memory usage by 60%, hallucination rates down 40%
Why It Matters
GPT-5.5 slashes costs and latency, making advanced AI viable for real-time enterprise apps and large-scale data processing.