OpenAI: GPT-3.5 Turbo 16k

GPT-3.5 Turbo 16k is a text-only model from OpenAI with a 16,385-token context window and a 4,096-token output cap. It supports tool use, which makes it usable in agentic pipelines, but it does not support reasoning modes and structured output availability is unconfirmed. Input is limited to text, so tasks involving images or other modalities require a different model. At $3.00 per million input tokens and $4.00 per million output tokens, it sits in a mid-range price bracket for established models. There is currently no independent benchmark coverage to validate its performance against peers, so quality claims are unproven on third-party measures. Teams that already rely on OpenAI tooling and need a longer context window than the base GPT-3.5 offers may find it a practical fit, but buyers prioritizing verified benchmark standings should weigh that gap carefully before committing.