Is DeepSeek V3.1 Terminus or OpenAI GPT-5 Nano cheaper?

OpenAI GPT-5 Nano is cheaper on output tokens ($0.40 vs $1.00 per 1M).

Which has the larger context window, DeepSeek V3.1 Terminus or OpenAI GPT-5 Nano?

OpenAI GPT-5 Nano has the larger context window (400K tokens).

DeepSeek V3.1 Terminus vs OpenAI GPT-5 Nano

OpenAI GPT-5 Nano is cheaper on output tokens, while OpenAI GPT-5 Nano offers a larger context window. Choose DeepSeek V3.1 Terminus or OpenAI GPT-5 Nano based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	DeepSeek V3.1 Terminus	OpenAI GPT-5 Nano
Provider	Helicone	Helicone
Input / 1M tokens	$0.27	$0.05
Output / 1M tokens	$1.00	$0.40
Context window	128K	400K
Parameters	—	—
Open weights	No	No
Released	Sep 2025	Jan 2025

DeepSeek V3.1 Terminus details →OpenAI GPT-5 Nano details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.