Question 1

What does this GPT-5 Chat (latest) vs GPT-5 Nano comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: GPT-5 Chat (latest) or GPT-5 Nano?

Accepted Answer

GPT-5 Chat (latest) lists $1.25 input and $10.00 output per 1M tokens. GPT-5 Nano lists $0.05 input and $0.40 output. The cheaper workload depends on the mix of input and output. Long-context tiers, caching, batch processing and retries can change the bill.

Question 3

Which has the larger context window: GPT-5 Chat (latest) or GPT-5 Nano?

Accepted Answer

Both records list a 400K-token context window. An equal limit does not imply equal recall, instruction following, or long-context quality.

Question 4

Which is faster: GPT-5 Chat (latest) or GPT-5 Nano?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do GPT-5 Chat (latest) and GPT-5 Nano support?

Accepted Answer

GPT-5 Chat (latest) records text, image input and text output. GPT-5 Nano records text, image input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose GPT-5 Chat (latest) or GPT-5 Nano?

Accepted Answer

Consider GPT-5 Nano if you need a lower listed input rate or a lower listed output rate. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	GPT-5 Chat (latest)	GPT-5 Nano
Provider	OpenAI	OpenAI
Listed pricing route	OpenAI	OpenAI
Model family	gpt-codex	gpt-nano
Accepted inputs	text, image	text, image
Produced outputs	text	text
Context window	400K	400K
Max output	128K	128K
Input price / 1M	$1.25	$0.05Lower
Output price / 1M	$10.00	$0.40Lower
Reasoning mode	Documented	Documented
Tool calling	Not documented	Documented
Image input	Documented	Documented
Audio input	Not documented	Not documented
Structured output	Documented	Documented
License	Proprietary	Proprietary

GPT-5 Chat (latest) vs GPT-5 Nano

GPT-5 Chat (latest)

GPT-5 Nano

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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