OpenAI: GPT-4 Turbo Preview

GPT-4 Turbo Preview is a text-input model from OpenAI with a 128,000-token context window and a 4,096-token output ceiling. It supports tool use, which makes it usable in agentic workflows and function-calling pipelines. It does not support reasoning modes, and structured output support is unconfirmed. There is no multimodal input; only text is accepted. At $10.00 per million input tokens and $30.00 per million output tokens, this is a relatively expensive option, and it carries no independent benchmark coverage to justify that cost on performance grounds. Buyers who are already embedded in the OpenAI ecosystem and need a large context window with tool support may shortlist it, but anyone making a cost-or-quality tradeoff decision should treat its capabilities as unproven by third-party standards until benchmark coverage appears.