Which AI model should you use to generate TypeScript types from JSON?

Use OpenAI: GPT-4o-mini (openai/gpt-4o-mini).

OpenAI: GPT-5 Mini is overkill here.

~5.6× cheaper per run.

Why ->

This task is bounded and predictable, so a smaller model handles it without leaving quality on the table. Reaching for a larger tier here adds cost faster than it improves the output.

Cost breakdown

Model	Provider	Tier	Input cost	Output cost	Est. / 1k calls
OpenAI: GPT-4o-mini `openai/gpt-4o-mini`	Openai	Routine	$0.000150	$0.000600	$0.23
OpenAI: GPT-5 Mini `openai/gpt-5-mini`	Openai	Moderate	$0.000250	$0.002000	$1.25

Matched signals

typescript type
sample

This recommendation is based on the task description alone. If you are attaching a large codebase, mention it in the input above.

Model pricing: OpenRouter model catalog, retrieved June 4, 2026. Classification: rightmodel ruleset v2. This recommendation cost zero tokens — a worked example of the Precomputed AI design pattern. View data provenance manifest.

Related tasks

Generate an OpenAPI Schema Example

Routine

Draft an OpenAPI example for a known endpoint shape, fields, and sample response.

Use OpenAI: GPT-4o-mini.

Format a JSON Payload Cleanly

Routine

Clean up a JSON payload for readability, validation, or quick inspection during development.

Use OpenAI: GPT-4o-mini.

Migrate JavaScript Module to TypeScript

Moderate

Convert a JavaScript module to TypeScript while preserving exports, behaviour, and type safety.

Use OpenAI: GPT-5 Mini.

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