OpenAI: GPT-5.3 Chat

GPT-5.3 Chat is a paid multimodal model from OpenAI that accepts text, images, and files as input. It offers a 128,000-token context window and up to 16,384 output tokens per response, and it supports tool use for function-calling workflows. Reasoning mode and structured output are not confirmed in available specifications, so teams with hard requirements in those areas should verify current support before committing. At $1.75 per million input tokens and $14.00 per million output tokens, the output cost is on the higher end of the current market, making it a better fit for lower-volume or high-value tasks than for bulk generation. Its blended benchmark score of 82.6 comes from only one benchmark, so treat that figure as a limited signal rather than a broad quality verdict. Teams that already use OpenAI tooling and need reliable multimodal input handling are the most natural fit here.