Google Gemini 3 vs ChatGPT: How they compare

In the battle to improve the capabilities of artificial intelligence, Google and OpenAI have both released new versions of their flagship chatbots: Gemini 3 and GPT-5.1. Google calls Gemini 3 its “most intelligent model yet,” while OpenAI pitches GPT-5.1 as “smarter” and “more conversational.”

When you compare the two, it really comes down to what you want from your environment-killing chatbot. On the AI side, both Gemini 3 and GPT-5.1 feel like real sequels instead of point upgrades. Google says its Gemini 3 model builds upon the agent-y, multimodal ideas from Gemini 2 and 2.5, fusing them into a single model that is better at reasoning, handling long-context multimodal work, and planning ahead. It also now powers features like Google’s new Antigravity developer platform and a Deep Think mode for genuinely challenging problems.

GPT-5.1, meanwhile, reportedly keeps the raw intelligence of GPT-5 but makes it way more direct and enjoyable to talk to. Instant and Thinking both adjust how much they “think” based on the question; they follow instructions more consistently, and they let you dial in the exact tone and personality you want across every chat.

So, to be as useful as possible, here’s a short breakdown of the key differences between the two models.

Gemini 3 versus GPT-5.1: Price

When it comes to cost, the two models occupy different price points. GPT‑5.1 from OpenAI has API pricing at about $1.25/ 1 M input tokens and $10.00/ 1 M output tokens. Meanwhile, the Gemini 3 Pro from Google lists token-based tiers at roughly $2.00 input / $12.00 output per million tokens for contexts of up to approximately 200,000 tokens, and about $ 4.00 and $18.00 for much larger contexts beyond that.

On the consumer subscription side, Gemini 3 offers a Pro tier at around $19.99 / month and an Ultra/Enterprise tier with custom pricing (reported to be up to ~$250/month for full features), while GPT-5.1-related consumer plans fall in the approximately $20/month and up range, depending on workflow needs.

Gemini 3 versus GPT-5.1: Model rankings

According to the latest LMArena rankings, Gemini 3 is sitting at the very top of the board with a score of 1324, making it the current fan favorite across thousands of votes. It’s not just edging out the competition, either. The next closest model is Gemini 2.5 Pro at 1249, which means Gemini 3 is leading by a meaningful margin.

GPT-5.1, listed on the board as GPT-5-chat, comes in further down with a score of 1222, placing it solidly in the upper tier but clearly behind Gemini 3’s surge. What’s interesting is the company GPT-5.1 has in those rankings: it’s surrounded by previous GPT generations and models, such as o3 and Claude Opus, all clustered tightly in the low 1200s.

Gemini 3, meanwhile, is the only model that breaks out of that pack entirely. The vibe from LMArena voters is pretty unmistakable. Gemini 3 is the model to beat right now, while GPT-5.1 is respected and well-liked but not commanding the same kind of top-of-the-charts energy.

Gemini 3 versus GPT-5.1: Key features

When it comes to multi-modal and long-context capabilities, Gemini 3 clearly outperforms. According to Google, it supports massive contexts (hundreds of thousands of tokens), handles images, text, and code with seamless transitions, and introduces a Deep Think mode for higher-order reasoning and planning across domains.

Meanwhile, GPT‑5.1 focuses more on conversational quality and reliability. The chatbot maintains strong performance in pure text generation and instruction following, with tone adjustments and personality fine-tuning built in. However, tests conducted by Tom’s Guide indicate that it doesn’t yet match Gemini 3’s breadth in modality or long-form reasoning.

In terms of accessibility and feature set for typical users, GPT-5.1 offers familiar workflows, including chat-based input, strong coherence over shorter contexts, and a refined interface for controlling tone, style, and persona. OpenAI says this makes it great for writing, Q&A, and interactive assistance.

On the other hand, Gemini 3 is built to scale for grander tasks — including multimodal inputs, more complex planning, and longer spans of context — which gives it the edge when tackling multi-step workflows, combining visuals and text, or generating highly technical outputs.

Disclosure: Ziff Davis, Mashable’s parent company, filed a lawsuit in April against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.