GPT-5 nano API Cost Calculator

OpenAI's GPT-5 nano: $0.05/M input · $0.4/M output · $0.005/M cached input. Price your own workload below.

Presets:

What GPT-5 nano costs in practice

WorkloadInputOutputCost
Short chat message500250$0.0001
10-page document + summary7,000500$0.0006
Agent / coding session50,00010,000$0.0065
1M tokens in + 1M out1,000,0001,000,000$0.450

GPT-5 nano vs nearest rivals

Closest-priced alternatives on a mixed 10K-input / 2K-output request:

ModelInput $/MTokOutput $/MTokMixed request
GPT-5 nano$0.05$0.4$0.0013
Gemini 2.5 Flash-Lite$0.1$0.4$0.0018
DeepSeek V4 Flash$0.14$0.28$0.0020
Mistral Small 4$0.15$0.6$0.0027

Frequently asked questions

How much does the GPT-5 nano API cost?

GPT-5 nano costs $0.05 per million input tokens and $0.4 per million output tokens, with cached input at $0.005 per million (90% off).

How much does a typical chat message cost with GPT-5 nano?

A short chat message (about 500 input and 250 output tokens) costs roughly $0.0001 with GPT-5 nano. At 1,000 such requests a day, that is about $3.75 per month.

Is GPT-5 nano cheap compared to similar models?

GPT-5 nano has the #1 cheapest input rate of the 26 models we track. On a mixed workload (10K input / 2K output), it costs $0.0013 per request and $0.0018 for Gemini 2.5 Flash-Lite.

Related

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Last updated 2026-08-03. Prices verified againstOpenAI's official pricing page; see themethodology.