GPT-6 Astra vs Gemini 3.1 Pro

GPT-6 and Gemini 3.1 at a glance

GPT-6 is an OpenAI model family with 3 variants (Astra, Sol and Luna) available in Quad Chat, with up to 1.05M tokens of context, image input, tool calling and adjustable reasoning. Gemini 3.1 is a Google model family with 2 variants (Pro and Flash Lite) available in Quad Chat, with up to 1M tokens of context, image input, tool calling and adjustable reasoning. This page compares specifications and plan availability from the Quad Chat model catalog. It does not publish benchmark scores, because quality depends on your task; the quickest fair test is to send the same prompt to both models in one Quad Chat conversation. Where a family has several variants, the head-to-head below uses the top variant (the one needing the highest plan, then the highest output price): GPT-6 Astra for GPT-6 and Gemini 3.1 Pro for Gemini 3.1.

GPT-6 Astra vs Gemini 3.1 Pro

Top variant of each family, side by side. Lab: GPT-6 Astra OpenAI, Gemini 3.1 Pro Google. Plan needed: GPT-6 Astra Pro ($15/month), Gemini 3.1 Pro Pro ($15/month). Context window: GPT-6 Astra 1.05M tokens, Gemini 3.1 Pro 1M tokens. Max output: GPT-6 Astra 128K tokens, Gemini 3.1 Pro 64K tokens. API input price: GPT-6 Astra $10.00 per 1M, Gemini 3.1 Pro $2.00 per 1M. API output price: GPT-6 Astra $50.00 per 1M, Gemini 3.1 Pro $12.00 per 1M. Image input: GPT-6 Astra Yes, Gemini 3.1 Pro Yes. Tool calling: GPT-6 Astra Yes, Gemini 3.1 Pro Yes. Reasoning: GPT-6 Astra Yes, adjustable (low, medium, high, xhigh, max), Gemini 3.1 Pro Yes, adjustable (low, medium, high). Privacy lane: GPT-6 Astra Private Lane (Zero Data Retention), Gemini 3.1 Pro Private Lane (Zero Data Retention).

Cheapest GPT-6 vs cheapest Gemini 3.1

The lowest-priced variant of each family, for everyday use. Lab: GPT-6 Luna OpenAI, Gemini 3.1 Flash Lite Google. Plan needed: GPT-6 Luna Free, Gemini 3.1 Flash Lite Free. Context window: GPT-6 Luna 1.05M tokens, Gemini 3.1 Flash Lite 1M tokens. Max output: GPT-6 Luna 128K tokens, Gemini 3.1 Flash Lite 65K tokens. API input price: GPT-6 Luna $0.10 per 1M, Gemini 3.1 Flash Lite $0.25 per 1M. API output price: GPT-6 Luna $0.50 per 1M, Gemini 3.1 Flash Lite $1.50 per 1M. Image input: GPT-6 Luna Yes, Gemini 3.1 Flash Lite Yes. Tool calling: GPT-6 Luna Yes, Gemini 3.1 Flash Lite Yes. Reasoning: GPT-6 Luna Yes, adjustable (low, medium, high, xhigh, max), Gemini 3.1 Flash Lite Yes, adjustable (low, high). Privacy lane: GPT-6 Luna Private Lane (Zero Data Retention), Gemini 3.1 Flash Lite Private Lane (Zero Data Retention).

Choose GPT-6 or Gemini 3.1

Each point below comes from a real difference in the catalog data. Choose GPT-6 if: You want a budget variant: GPT-6 Luna is the cheapest in its family at $0.10 in / $0.50 out, below Gemini 3.1 Flash Lite at $0.25 in / $1.50 out. You need very long replies in one go: it can write up to 128K tokens, against 65K. You like choosing a size: GPT-6 comes in 3 variants (GPT-6 Astra, GPT-6 Sol and GPT-6 Luna), against 2. Choose Gemini 3.1 if: You want the lower API list price at the top tier: Gemini 3.1 Pro lists at $2.00 in / $12.00 out against $10.00 in / $50.00 out for GPT-6 Astra, about 4.2× less per output token. Both families start on the Free plan. Their context windows are within 10% of each other (1.05M and 1M tokens). You do not have to choose: Quad Chat lets you switch between GPT-6 and Gemini 3.1 in the same conversation, or ask both at once and compare the answers.

Every GPT-6 and Gemini 3.1 variant

All selectable variants of both families. Click a header to sort. GPT-6: GPT-6 Astra (Pro), GPT-6 Sol (Pro), GPT-6 Luna (Free). Gemini 3.1: Gemini 3.1 Pro (Pro), Gemini 3.1 Flash Lite (Free).

Frequently asked questions

Is GPT-6 or Gemini 3.1 cheaper?

At provider list prices, Gemini 3.1 Pro is cheaper at the top tier ($2.00 in / $12.00 out against $10.00 in / $50.00 out per million tokens). API prices are the model provider's list prices per million tokens, shown for comparison only. Quad Chat plans have a flat monthly price and draw usage from shared credits, so you are not billed per token.

Which has the larger context window, GPT-6 or Gemini 3.1?

GPT-6 reaches 1.05M tokens, against 1M for Gemini 3.1, according to the model catalog Quad Chat routes through. Files, pasted text and earlier messages all count toward the window.

Which Quad Chat plan do I need for GPT-6 and Gemini 3.1?

GPT-6 starts on the Free plan, and its top variant, GPT-6 Astra, needs the Pro ($15/month) plan. Gemini 3.1 starts on the Free plan, and its top variant, Gemini 3.1 Pro, needs the Pro ($15/month) plan. Plans are cumulative, and every plan shares one monthly credit balance (100 on Free up to 25,000 on Max).

Do GPT-6 and Gemini 3.1 support images, tools and reasoning?

GPT-6 Astra: image input yes, tool calling yes, reasoning yes. Gemini 3.1 Pro: image input yes, tool calling yes, reasoning yes. Other variants in each family can differ, as the variant table shows.

Can I use GPT-6 and Gemini 3.1 in the same chat?

Yes. In Quad Chat you can switch between models mid-conversation without losing your files or context, or send one prompt to both and compare the answers side by side, which is the most reliable way to decide between them for your own work. Side-by-side comparison is included on every plan.

Is GPT-6 or Gemini 3.1 more private in Quad Chat?

Both top variants run on the Private Lane, routed to providers under Zero Data Retention terms. Quad Chat does not train models on your conversations either way.