OpenAI: GPT-5 Chat

GPT-5 Chat is OpenAI's text-focused chat model with a 128,000-token context window and support for file, image, and text inputs. It can handle moderately long documents and multimodal prompts, but it does not support tool use, reasoning modes, or structured output, which limits its utility in agentic pipelines or applications requiring reliable schema-conformant responses. At $1.25 per million input tokens and $10.00 per million output tokens, the output cost is notably high relative to many alternatives, making it a poor fit for high-volume generation workloads. There is currently no independent benchmark coverage, so performance claims remain unverified by third parties. Buyers who want an established vendor name and multimodal input support may shortlist it, but the combination of a steep output price and no benchmark data means it is difficult to justify over better-documented competitors without hands-on testing.