GPT-5.5 Pro

What is GPT-5.5 Pro?

GPT-5.5 Pro is an AI model developed by OpenAI, classified as a large language model (LLM). It is a multimodal model, capable of processing text, images, and potentially other media types. As a proprietary model, it is available via OpenAI's cloud API. With a context window of 1.1M tokens, it is suitable for processing long documents such as contracts, books, and complete codebases.

Pricing & Costs in 2026

GPT-5.5 Pro does not have public per-token pricing available at this time. Some models offer access via enterprise plans or research programs. Check OpenAI's official website for up-to-date availability and pricing.

Benchmarks & Performance

We don't have detailed benchmark results for GPT-5.5 Pro yet. Benchmarks are updated weekly as new data becomes available from sources like Artificial Analysis, LM Arena, and LiveBench.

It's important to note that benchmarks measure specific aspects and don't capture the full user experience. Factors like instruction adherence, behavior in long conversations, and real-world task quality vary significantly between models and aren't always reflected in standard scores.

Recommended Use Cases

GPT-5.5 Pro is suitable for a wide range of AI applications: long document analysis (contracts, legal proceedings, codebases), multimodal processing combining text and images, text generation, summarization, translation, and general assistance.

Comparison with Alternatives

In the 2026 AI model ecosystem, GPT-5.5 Pro competes directly with similarly capable models. Key competitors include Claude (Anthropic), Gemini (Google), and open source models like Llama (Meta) and Qwen (Alibaba). The choice between models depends on the specific use case, budget, latency requirements, and need for features like multimodality and tool calling.

For a detailed side-by-side comparison, use our comparison tool or check the overall model ranking.