Guide · 8 min read · Updated July 2026
Best AI Aggregator: GPT-4o vs Claude 3.5 Sonnet vs Gemini 1.5 Pro
You don’t have to pick just one. Here’s how the top three frontier models actually differ — and why paying for a single aggregator beats juggling three subscriptions.
TL;DR
- GPT-4o — fastest all-rounder, best voice/vision, great for everyday tasks.
- Claude 3.5 Sonnet — most reliable long writing and code refactors.
- Gemini 1.5 Pro — enormous 2M-token context, strongest at analyzing entire codebases or documents.
- Best AI aggregator — pay one subscription, switch between all three (plus DeepSeek, Llama, and image models) per task instead of guessing.
Why an aggregator instead of three subscriptions
ChatGPT Plus, Claude Pro, and Gemini Advanced each cost roughly $20/month. Three subscriptions is $60/month, three logins, three chat histories, three billing relationships — for models that are each stronger at different things. An AI aggregator like Zovex bundles them behind one account: same chat, same history, switch models mid-conversation.
The trade-off used to be that aggregators felt second-class — slower streaming, missing features, no image generation. That’s no longer true. Modern aggregators stream tokens directly from OpenAI / Anthropic / Google APIs, support vision and file uploads, and route through the same providers you’d hit as a direct subscriber.
GPT-4o — the default choice
GPT-4o (“omni”) is OpenAI’s current flagship. It’s the fastest of the three at conversational latency and has the strongest voice and vision integration. If you’re asking one model to handle daily tasks — email drafting, summarising a webpage, quick coding help — GPT-4o is a safe default.
Best for: everyday chat, quick coding help, voice input, image understanding, real-time back-and-forth.
Claude 3.5 Sonnet — the writer’s pick
Anthropic’s Claude 3.5 Sonnet is the model most professional writers and engineers keep coming back to. It handles long-form content, nuanced tone, multi-file code refactors, and technical reasoning noticeably better than GPT-4o on many benchmarks — and its output feels more polished out of the box.
Best for: long-form writing, editing, code review, careful reasoning where quality matters more than speed.
Gemini 1.5 Pro — the context king
Google’s Gemini 1.5 Pro’s standout feature is context window — up to 2 million tokens. That’s hundreds of thousands of words, entire codebases, or hours of transcript in a single prompt. If you need a model to read a whole book, an entire repo, or a full customer-support archive and answer questions about it, Gemini is the only one that comfortably fits everything in memory.
Best for: long-document analysis, whole-repo understanding, multi-file research.
Side-by-side
| Model | Best at | Context | Direct price |
|---|---|---|---|
| GPT-4o | Speed, voice, vision | 128K | $20/mo |
| Claude 3.5 Sonnet | Writing, code, reasoning | 200K | $20/mo |
| Gemini 1.5 Pro | Long context | 2M | $20/mo |
How to actually choose
- Fast reply, quick help, image input → GPT-4o.
- Long draft, careful writing, code refactor → Claude 3.5 Sonnet.
- Whole document / whole codebase → Gemini 1.5 Pro.
- Don’t know which yet → start with one, switch mid-thread if it stalls.
Try all three in one place
Zovex is an AI aggregator built for exactly this workflow: one account, one subscription, and a model picker in the chat input so you can send the same question to GPT-4o, Claude 3.5 Sonnet, or Gemini 1.5 Pro without leaving the conversation. Start on the free plan and switch to a paid tier when you want the frontier models unlocked.