GPT-3.5 Turbo

GPT-3.5 Turbo is positioned as a cost-efficient large language model from OpenAI, packaged for practical chat assistants, retrieval-augmented workflows, and lightweight tool integrations. It is explicitly described as supporting function calling, which lets developers hand off structured actions to external services, and it exposes a response_format capability for shaping structured outputs. Together these features make it a flexible middle-ground option for teams that need reliable conversational reasoning plus programmatic interfaces, without paying the premium attached to larger OpenAI models.

On the technical side, GPT-3.5 Turbo is reported to handle a sixteen-thousand-token context window with up to four thousand tokens of output, which is well suited to multi-turn conversations and moderately sized document grounding. Pricing is listed at half a dollar per million input tokens and a dollar and a half per million output tokens, reinforcing its reputation as an economical workhorse in its class. Through Inworld Router it is reachable with OpenAI SDK compatibility, built-in failover, and routing across providers, which simplifies integration for production deployments that want redundancy and a familiar developer experience.