# GPT-5.3 Chat: AI model fact sheet

- **Provider:** openai
- **Released:** 2026-03-03
- **Context window:** 128,000 tokens
- **API pricing:** $1.75 / 1M input, $14.00 / 1M output
- **OpenRouter ID:** openai/gpt-5.3-chat
- **Capabilities:** conversation, reasoning, code-generation, analysis

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly reduces unnecessary refusals, caveats, and overly cautious phrasing that can interrupt conversational flow. The model is more willing to engage with nuanced topics, produces cleaner and more natural prose, and maintains strong performance across reasoning, coding, and creative tasks while feeling less robotic in casual interaction.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gpt-5.3-chat