Claude Opus 5.5 vs Gemini 3.1 Pro

Claude Opus 5.5 and Gemini 3.1 at a glance

Claude Opus 5.5 is an Anthropic model available in Quad Chat, with up to 1M 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): Gemini 3.1 Pro for Gemini 3.1.

Claude Opus 5.5 vs Gemini 3.1 Pro

Top variant of each family, side by side. Lab: Claude Opus 5.5 Anthropic, Gemini 3.1 Pro Google. Plan needed: Claude Opus 5.5 Ultra ($40/month), Gemini 3.1 Pro Pro ($15/month). Context window: Claude Opus 5.5 1M tokens, Gemini 3.1 Pro 1M tokens. Max output: Claude Opus 5.5 128K tokens, Gemini 3.1 Pro 64K tokens. API input price: Claude Opus 5.5 $4.00 per 1M, Gemini 3.1 Pro $2.00 per 1M. API output price: Claude Opus 5.5 $20.00 per 1M, Gemini 3.1 Pro $12.00 per 1M. Image input: Claude Opus 5.5 Yes, Gemini 3.1 Pro Yes. Tool calling: Claude Opus 5.5 Yes, Gemini 3.1 Pro Yes. Reasoning: Claude Opus 5.5 Yes, adjustable (low, medium, high, xhigh, max), Gemini 3.1 Pro Yes, adjustable (low, medium, high). Privacy lane: Claude Opus 5.5 Private Lane (Zero Data Retention), Gemini 3.1 Pro Private Lane (Zero Data Retention).

Cheapest Claude Opus 5.5 vs cheapest Gemini 3.1

The lowest-priced variant of each family, for everyday use. Lab: Claude Opus 5.5 Anthropic, Gemini 3.1 Flash Lite Google. Plan needed: Claude Opus 5.5 Ultra ($40/month), Gemini 3.1 Flash Lite Free. Context window: Claude Opus 5.5 1M tokens, Gemini 3.1 Flash Lite 1M tokens. Max output: Claude Opus 5.5 128K tokens, Gemini 3.1 Flash Lite 65K tokens. API input price: Claude Opus 5.5 $4.00 per 1M, Gemini 3.1 Flash Lite $0.25 per 1M. API output price: Claude Opus 5.5 $20.00 per 1M, Gemini 3.1 Flash Lite $1.50 per 1M. Image input: Claude Opus 5.5 Yes, Gemini 3.1 Flash Lite Yes. Tool calling: Claude Opus 5.5 Yes, Gemini 3.1 Flash Lite Yes. Reasoning: Claude Opus 5.5 Yes, adjustable (low, medium, high, xhigh, max), Gemini 3.1 Flash Lite Yes, adjustable (low, high). Privacy lane: Claude Opus 5.5 Private Lane (Zero Data Retention), Gemini 3.1 Flash Lite Private Lane (Zero Data Retention).

Choose Claude Opus 5.5 or Gemini 3.1

Each point below comes from a real difference in the catalog data. Choose Claude Opus 5.5 if: You need very long replies in one go: it can write up to 128K tokens, against 65K. 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 $4.00 in / $20.00 out for Claude Opus 5.5, about 1.7× less per output token. You want the cheapest entry point: Gemini 3.1 Flash Lite lists at $0.25 in / $1.50 out, below Claude Opus 5.5 at $4.00 in / $20.00 out. You want to start on a lower plan: Gemini 3.1 has a variant on the Free plan (no credit card), while Claude Opus 5.5 starts at Ultra ($40/month). You want top-tier access for less: Gemini 3.1 Pro needs Pro ($15/month), while Claude Opus 5.5 needs Ultra ($40/month). You like choosing a size: Gemini 3.1 comes in 2 variants (Gemini 3.1 Pro and Gemini 3.1 Flash Lite), against 1. Their context windows are within 10% of each other (1M and 1M tokens). You do not have to choose: Quad Chat lets you switch between Claude Opus 5.5 and Gemini 3.1 in the same conversation, or ask both at once and compare the answers.

Every Claude Opus 5.5 and Gemini 3.1 variant

All selectable variants of both families. Click a header to sort. Claude Opus 5.5: Claude Opus 5.5 (Ultra). Gemini 3.1: Gemini 3.1 Pro (Pro), Gemini 3.1 Flash Lite (Free).

Frequently asked questions

Is Claude Opus 5.5 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 $4.00 in / $20.00 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, Claude Opus 5.5 or Gemini 3.1?

They match: both reach 1M tokens. Files, pasted text and earlier messages all count toward the window.

Which Quad Chat plan do I need for Claude Opus 5.5 and Gemini 3.1?

Claude Opus 5.5 needs the Ultra ($40/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 Claude Opus 5.5 and Gemini 3.1 support images, tools and reasoning?

Claude Opus 5.5: 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 Claude Opus 5.5 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 Claude Opus 5.5 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.