Free AI Agent Comparison Online - TestMu AI (Formerly LambdaTest)

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Attribute	ChatGPT (GPT-5.4)	Claude (Claude Opus 4.8)
Developer	OpenAI	Anthropic
Type	LLM	LLM
Access	Closed (API)	Closed (API)
Input modalities	Text, Image, PDF	Text, Image, PDF
Context window	1.05M tokensBest	1M tokens
Max output	128K tokens	128K tokens
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Input price	$2.5 / 1MBest	$5 / 1M
Output price	$15 / 1MBest	$25 / 1M
Knowledge cutoff	2025-08	2026-01
Released	2026-03-05	2026-05-28
Best for	General-purpose reasoning, coding, and multimodal chat	Long-context analysis, coding, and careful writing
Official	ChatGPT docs	Claude docs

Full AI model comparison matrix

All seventeen models at a glance. Search, filter, and click any column heading to sort. Foundation models pull live context and pricing from models.dev; assistant products (GitHub Copilot, Kane AI) show curated data because they route across multiple underlying models.

What is the AI Agent Comparison tool?

The AI Agent Comparison tool is a free, browser-based utility that compares popular AI models and assistants side by side. It shows developer, access model, context window, token pricing, modalities, and capabilities for options like ChatGPT, Claude, Gemini, and Grok, using live specifications from the open models.dev registry.

Unlike a static roundup, the data refreshes each time the page loads, so context windows and prices reflect current provider figures. All processing happens in your browser, and your selections never leave your device. To discover agents by role and budget instead, use the AI Agent Finder.

How does the AI Agent Comparison tool work?

On load, the tool fetches the public models.dev JSON registry and maps each model to its live entry for context window, token pricing, modalities, reasoning support, and access type.

• Live first: foundation models such as GPT-5.4 and Claude Opus 4.8 read their numbers directly from models.dev.
• Snapshot fallback: if the registry is unreachable, a bundled snapshot verified on July 21, 2026 is used instead, so the tool never breaks.
• Curated assistants: GitHub Copilot and Kane AI route across multiple models, so their rows show curated capability data rather than a single price.
• Token pricing: input and output prices are quoted per one million tokens in US dollars, matching how providers bill API usage.

How to use this AI Agent Comparison tool

• Pick your models: choose two to four models from the dropdowns, then use Add model to compare more side by side.
• Read the highlighted table: scan developer, access, context window, pricing, and capability rows, with the best value in each numeric row marked Best.
• Filter and sort the matrix: search, filter by vision, reasoning, or open weights, and click any column heading to sort all seventeen models.
• Share a link: click Copy link to share a URL that reopens your exact comparison for a teammate.
• Export the data: click Copy as Markdown or Download CSV to drop the comparison into your docs or pull request.

Use cases of the AI Agent Comparison tool

• Model selection: pick the right model for a feature by weighing context window against input and output price.
• Budget planning: estimate API cost by reading per-million-token pricing before you commit to a provider.
• Capability checks: confirm reasoning, tool calling, and multimodal support before wiring a model into an app.
• QA and test automation: compare a general model against Kane AI, the TestMu AI agent for end-to-end test authoring, then run your suites across 10,000+ real devices and 3000+ browsers.
• Open versus closed: decide between open-weight models like Llama and DeepSeek and closed APIs when self-hosting matters.
• Shortlist then compare: narrow the field with the AI Agent Finder, score deployment risk with the AI Agent Risk Scorer, then draft prompts with the AI Agent Prompt Generator.

Difference between an AI model and an AI agent

The names overlap, but they describe different layers. For deeper terminology, see the AI Agent Glossary.

Frequently Asked Questions (FAQs)

What is the AI Agent Comparison tool?

The AI Agent Comparison tool is a free, browser-based utility that compares popular AI models and assistants side by side. It shows developer, access model, context window, token pricing, modalities, and capabilities for models such as ChatGPT, Claude, Gemini, and Grok, using live specifications from the open models.dev registry.

Where does the AI model data come from?

Model specifications are loaded live from models.dev, an open-source AI model registry, each time the page opens. If that source is unreachable, the tool falls back to a bundled snapshot verified on July 21, 2026. Every row also links to the provider's official model page so you can confirm current pricing.

Which AI models can I compare?

The tool compares seventeen popular options: ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), Grok (xAI), Llama (Meta), DeepSeek, Mistral, Qwen (Alibaba), Kimi (Moonshot AI), GLM (Z.ai), Command (Cohere), MiniMax, Nova (Amazon), Nemotron (NVIDIA), Perplexity, GitHub Copilot, and Kane AI by TestMu AI. Foundation models show live context and pricing; assistant products show curated capability data.

What is the difference between an AI model and an AI agent?

An AI model is a trained large language model that generates text from a prompt, such as GPT-5.4 or Claude Opus 4.8. An AI agent wraps one or more models with tools, memory, and a control loop so it can plan and execute multi-step tasks autonomously, such as running a test suite end to end.

Does the tool upload my data or track my selections?

No. All comparison logic runs in your browser using client-side JavaScript, and your model selections never leave your device. The only network request is a read-only fetch of the public models.dev registry to refresh specifications. No account, login, or personal data is required.

What does context window mean when comparing AI models?

The context window is the maximum number of tokens a model can process in a single request, covering both the prompt and the response. A larger context window, such as 1 million tokens, lets a model handle longer documents, bigger codebases, and more chat history without truncation.

How is input price different from output price?

Most API providers bill separately for tokens you send (input) and tokens the model generates (output), quoted per one million tokens in US dollars. Output tokens usually cost more than input tokens, so a chatty model that returns long responses can cost more than its input price alone suggests.

Is the AI Agent Comparison tool free to use?

Yes, the AI Agent Comparison tool is completely free with no registration or subscription. You can compare up to four models at once, highlight the best value in each row, share a link, export to Markdown or CSV, and filter or sort the full matrix of all seventeen models, directly in your browser.