🟢 OpenAI (GPT / o-series)
TL;DR
• GPT-5.x for general work; o-series for cheap chain-of-thought reasoning
• Responses API is the current standard; structured outputs enforce JSON Schema
• Strong multimodal support — vision, audio, image generation in one API
Model picking
GPT-5.x = general-purpose default. o-series = reasoning models that "think" before answering — better at math, logic, planning; slower and billed for thinking tokens. Mini variants of both trade quality for speed/price.
Structured outputs
Pass a JSON Schema with strict mode and the model is constrained to valid output matching it. Use for anything parsed by code — it eliminates the "model added commentary around the JSON" class of bug.
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