Cheapest OpenAI Models

Match · Updated July 2026

The cheapest OpenAI model is GPT-5 Nano (batch) at $0.025 per million input tokens. gpt-oss-20b ($0.030) and gpt-oss-120b ($0.037) round out the top three.

$0.025Input /M

19.9Intelligence

400KContext

AI models ranked by input token price. The cheapest LLM APIs and most affordable AI models, from budget open-weight models to discounted frontier models.

Frequently asked

What is the cheapest OpenAI model?

The cheapest OpenAI model is GPT-5 Nano (batch) at $0.025 per million input tokens. gpt-oss-20b ($0.030) and gpt-oss-120b ($0.037) round out the top three.

What's a good alternative to GPT-5 Nano (batch)?

gpt-oss-20b ($0.030) is the closest alternative on this metric, followed by gpt-oss-120b ($0.037). See the full ranking above for the tradeoffs.

How many OpenAI models are there?

modelgrep tracks 70 OpenAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GPT-5.6 Sol. 25 of them qualify for this ranking.

More OpenAI rankings

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All rankings

Small & Fast LLMs Best Local LLMs Smartest LLMs Best LLMs for Coding Best LLMs for Design & Frontend Fastest LLMs Lowest-Latency LLMs Best Free LLMs Best Reasoning LLMs Best Vision LLMs Best LLMs for Agents Best Open-Source LLMs Longest-Context LLMs Best LLMs for Writing Best LLMs for Math & Science Best LLMs for RAG Best LLMs for SQL & Data Analysis Best LLMs for Roleplay Best Uncensored LLMs