GPT-6 Astra vs Gemini 3.1 Pro (Preview)

GPT-6 Astra from OpenAI and Gemini 3.1 Pro (Preview) from Google, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.

Side-by-side comparison of GPT-6 Astra, Gemini 3.1 Pro (Preview)

Attribute	GPT-6 Astra	Gemini 3.1 Pro (Preview)
Provider	OpenAI	Google
Model id	openai/gpt-6-astra	google/gemini-3.1-pro-preview
Status	Available via Safeguard	Available via Safeguard
Input / 1M tokens	$10	$2
Output / 1M tokens	$50	$12
Price notes	Standard tier, prompts <=272K input tokens. Over 272K: $20 in / $75 out. Cached input $1.00. Batch and Flex 50% off.	Preview model. Prompts <=200K tokens, over 200K: $4 in / $18 out. Output includes thinking tokens. No free tier.
Context	1.05M	1.05M
Parameters	Not published	Not published
Max output	128,000 tokens	65,536 tokens
Modality	Text and image	Text and image
Weights	Closed	Closed
Zero data retention	Available	Not offered
Prompts go to	OpenAI (no processing-region constraint by default)	Google (Gemini Developer API)
Retention	API data not used for training unless you opt in, abuse monitoring logs that can include prompts and responses kept up to 30 days by default, some features store application state	Paid tier: prompts and responses not used to improve Google products, but logged for a limited period for abuse monitoring, free tier content may be used to improve products
Region	Global by default, data residency projects in US, EU and other regions (approval required, 10% uplift for models released on or after 2026-03-05)	No region guarantee, data may be stored transiently or cached in any country where Google operates. Google points ZDR and enterprise processing needs to Vertex AI (Gemini Enterprise Agent Platform)
Price checked	2026-10-08	2026-10-08

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