Model comparison

GPT-5.3 Codex vs GPT-5.4 Nano

Compare GPT-5.3 Codex (OpenAI) and GPT-5.4 Nano (OpenAI) by price, context, capabilities, and latency.

Which should you pick?

Price: GPT-5.4 Nano is cheaper ($0.2 / 1M tokens input / $1.25 / 1M tokens output) vs GPT-5.3 Codex ($1.75 / 1M tokens input / $14 / 1M tokens output).

Side by side

GPT-5.3 Codex vs GPT-5.4 Nano — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

Model	Provider	Input	Output	Context	Capabilities	Best for	Latency	Status	Source
GPT-5.3 Codexopenai/gpt-5.3-codex	OpenAI	$1.75 / 1M tokens	$14 / 1M tokens	400k	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1814-3985ms	Catalog	Platform curated
GPT-5.4 Nanoopenai/gpt-5.4-nano	OpenAI	$0.2 / 1M tokens	$1.25 / 1M tokens	400k	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1825-4485ms	Catalog	Platform curated

FAQ

GPT-5.3 Codex vs GPT-5.4 Nano FAQ

Is GPT-5.3 Codex or GPT-5.4 Nano cheaper?

GPT-5.4 Nano is cheaper ($0.2 / 1M tokens input / $1.25 / 1M tokens output) vs GPT-5.3 Codex ($1.75 / 1M tokens input / $14 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, GPT-5.3 Codex or GPT-5.4 Nano?

Both offer the same context window: 400k tokens.

GPT-5.3 Codex vs GPT-5.4 Nano for Vision: which should I pick?

Both target Vision. Pick GPT-5.4 Nano to optimize cost, or GPT-5.3 Codex for the longer context window. Test both on real prompts before committing production traffic.

GPT-5.3 Codex details GPT-5.4 Nano details Pricing calculator OpenAI-compatible quickstart