What is the difference between GPT-5 Pro and Inkling?

GPT-5 Pro is developed by OpenAI while Inkling is developed by Thinking Machines. GPT-5 Pro has a 400K token context window vs Inkling's 1.0M. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Pro or Inkling?

It depends on your use case. GPT-5 Pro and Inkling each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

How much does GPT-5 Pro cost compared to Inkling?

GPT-5 Pro costs $15/M input tokens and Inkling costs $1/M input tokens. Inkling is $14.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5 Pro and Inkling on Rival?

This page shows a side-by-side comparison of GPT-5 Pro and Inkling across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Jul 2026

GPT-5 ProvsInkling

Inkling is cheaper than GPT-5 Pro at $1/M vs $15/M input tokens.

GPT-5 Pro and Inkling compared across 41 shared prompts
Spec	GPT-5 Pro	Inkling
Input price	$15/M tokens	$1/M tokens
Output price	$120/M tokens	$4.05/M tokens
Context window	400K tokens	1.0M tokens
Weights	Closed	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Oct 2025	Jul 2026