Models
What Models Power Perplexity, ChatGPT, and Claude? GPT-5, Claude, and Reasoning Models Compared
Model names change quickly, so the product comparison matters more than memorizing a model picker. ChatGPT is OpenAI's own assistant, Claude is Anthropic's own assistant, and Perplexity is a search product that can route work across its own Sonar models and third-party models.
Perplexity's advantage is model flexibility inside a source-first search experience. ChatGPT's advantage is the deepest OpenAI product integration. Claude's advantage is Anthropic's strongest writing and reasoning experience.
Quick Verdict
ChatGPT has the best general reasoning platform, Claude is the strongest prose and long-context thinker for many users, and Perplexity is the best multi-model research layer.
Does Perplexity Use ChatGPT?
Perplexity is not ChatGPT, but Perplexity Pro can include OpenAI models alongside models from Anthropic, Google, xAI, and Perplexity's own Sonar family, depending on current availability and plan.
What Powers ChatGPT and Claude
ChatGPT is powered by OpenAI models and tools. Claude is powered by Anthropic's Claude models. Their paid plans mostly buy more capacity, better model access, and more advanced workflow features.
Why the Product Layer Matters
A strong model inside the wrong product can still be the wrong tool. Perplexity wraps models in retrieval and citations. ChatGPT wraps models in tools. Claude wraps models in a thoughtful assistant experience.
Direct Answers
Does Perplexity use ChatGPT?
Perplexity can provide access to OpenAI models, but it is a separate product. It also uses its own Sonar models and other third-party models.
What models power Perplexity?
Perplexity's public help page lists Sonar, GPT-5.2, Claude Sonnet 4.6, Gemini 3.1 Pro, and other advanced models depending on mode and plan availability.
Claude vs Perplexity vs ChatGPT: which model is best?
ChatGPT is the best general platform, Claude is often best for nuanced writing and synthesis, and Perplexity is best when the model must be grounded in current sources.
GPT-5 vs Perplexity: which is better?
GPT-5-class ChatGPT is better for reasoning, writing, coding, and tool use. Perplexity is better when the task starts with current web research and citations.
Which AI has the best reasoning model?
For most users, ChatGPT has the strongest reasoning product because OpenAI pairs advanced models with coding, files, tools, memory, projects, and research workflows.
Source note
Product features, model access, and pricing change quickly. These articles were last checked on June 1, 2026 against official help and product documentation.
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Anthropic on Perplexity using Claude