What is the difference between Gemini 2.5 Flash Preview (thinking) and GPT-6 Astra?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while GPT-6 Astra is developed by OpenAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs GPT-6 Astra's 1.1M. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview (thinking) or GPT-6 Astra?

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and GPT-6 Astra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to GPT-6 Astra?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and GPT-6 Astra costs $10/M input tokens. Gemini 2.5 Flash Preview (thinking) is $9.82/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 Gemini 2.5 Flash Preview (thinking) and GPT-6 Astra on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview (thinking) and GPT-6 Astra 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 Sep 2026

Gemini 2.5 Flash Preview (thinking)vsGPT-6 Astra

Gemini 2.5 Flash Preview (thinking) is cheaper than GPT-6 Astra at $0.175/M vs $10/M input tokens.

Gemini 2.5 Flash Preview (thinking) and GPT-6 Astra compared across 20 shared prompts
Spec	Gemini 2.5 Flash Preview (thinking)	GPT-6 Astra
Input price	$0.175/M tokens	$10/M tokens
Output price	$3.5/M tokens	$50/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Apr 2025	Sep 2026