Claude Opus 5.5 vs GPT-6.1 Sol

Claude Opus 5.5 and GPT-6.1 Sol 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. GPT-6.1 Sol is an OpenAI model available in Quad Chat, with up to 1.05M 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. Each family has a single variant, so the head-to-head compares them directly.

Claude Opus 5.5 vs GPT-6.1 Sol

Top variant of each family, side by side. Lab: Claude Opus 5.5 Anthropic, GPT-6.1 Sol OpenAI. Plan needed: Claude Opus 5.5 Ultra ($40/month), GPT-6.1 Sol Pro ($15/month). Context window: Claude Opus 5.5 1M tokens, GPT-6.1 Sol 1.05M tokens. Max output: Claude Opus 5.5 128K tokens, GPT-6.1 Sol 128K tokens. API input price: Claude Opus 5.5 $4.00 per 1M, GPT-6.1 Sol $2.00 per 1M. API output price: Claude Opus 5.5 $20.00 per 1M, GPT-6.1 Sol $10.00 per 1M. Image input: Claude Opus 5.5 Yes, GPT-6.1 Sol Yes. Tool calling: Claude Opus 5.5 Yes, GPT-6.1 Sol Yes. Reasoning: Claude Opus 5.5 Yes, adjustable (low, medium, high, xhigh, max), GPT-6.1 Sol Yes, adjustable (low, medium, high, xhigh, max). Privacy lane: Claude Opus 5.5 Private Lane (Zero Data Retention), GPT-6.1 Sol Private Lane (Zero Data Retention).

Choose Claude Opus 5.5 or GPT-6.1 Sol

Each point below comes from a real difference in the catalog data. Choose Claude Opus 5.5 if: The catalog shows no spec advantage for Claude Opus 5.5 in this pairing, so choose it after running your own prompts on both. Choose GPT-6.1 Sol if: You want the lower API list price at the top tier: GPT-6.1 Sol lists at $2.00 in / $10.00 out against $4.00 in / $20.00 out for Claude Opus 5.5, about 2.0× less per output token. You want to start on a lower plan: GPT-6.1 Sol has a variant on the Pro ($15/month) plan, while Claude Opus 5.5 starts at Ultra ($40/month). You want top-tier access for less: GPT-6.1 Sol needs Pro ($15/month), while Claude Opus 5.5 needs Ultra ($40/month). Their context windows are within 10% of each other (1M and 1.05M tokens). Their longest replies are within 10% of each other (128K and 128K tokens). You do not have to choose: Quad Chat lets you switch between Claude Opus 5.5 and GPT-6.1 Sol in the same conversation, or ask both at once and compare the answers.

Every Claude Opus 5.5 and GPT-6.1 Sol variant

All selectable variants of both families. Click a header to sort. Claude Opus 5.5: Claude Opus 5.5 (Ultra). GPT-6.1 Sol: GPT-6.1 Sol (Pro).

Frequently asked questions

Is Claude Opus 5.5 or GPT-6.1 Sol cheaper?

At provider list prices, GPT-6.1 Sol is cheaper at the top tier ($2.00 in / $10.00 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 GPT-6.1 Sol?

GPT-6.1 Sol reaches 1.05M tokens, against 1M for Claude Opus 5.5, 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 Claude Opus 5.5 and GPT-6.1 Sol?

Claude Opus 5.5 needs the Ultra ($40/month) plan. GPT-6.1 Sol 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 GPT-6.1 Sol support images, tools and reasoning?

Claude Opus 5.5: image input yes, tool calling yes, reasoning yes. GPT-6.1 Sol: 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 GPT-6.1 Sol 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 GPT-6.1 Sol 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.