GPT-5.5

Why it matters

GPT-5.5 is a dated addition to OpenAI's model line. It gives OpenAI a new option in multimodal, language, vision with API access.

Without an exact-match LMArena rating in the current snapshot, this briefing records the launch fact and operating characteristics rather than benchmark leadership. That is still useful for tracking release cadence and provider coverage.

What changed

A new record entered the field.

Epoch AI's catalog records GPT-5.5 as a multimodal, language, vision model for Language modeling/generation, Question answering. It lists API access and closed weights.

Likely use cases

Where this model fits

• Text generation, summarization, and conversational interfaces where the lab's API is available.
• Tasks that combine text and image inputs, such as visual question answering or document understanding.
• Image-only or vision-first tasks that do not require text output.

Evidence boundary

What this brief proves and does not prove

This brief records a dated release and catalog classifications. It does not claim benchmark leadership, adoption, price, latency, or overall superiority.

For model selection, evaluate the release against the task, cost, latency, access, and risk requirements that apply to your deployment.