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Choosing an AI model: ChatGPT, Claude and Gemini compared

Each of the big three AI companies sells a family of models, from small, fast and cheap to large, slow and expensive. The right one depends on the task more than the brand: short rewrites and quick questions rarely need more than a light model, while multi-step analysis and complex code are where larger models earn their price.

PromptSaver sorts every current model into four levels so you can compare like with like across companies. The table below shows today's cheapest pick at each level.

LevelGood forClaudeChatGPTGemini
LightShort copy, rewrites, tagging, extracting fields, quick questionsClaude Haiku 5.5$0.10 / $0.50 per 1M tokensGPT-6 Luna$0.10 / $0.50 per 1M tokensGemini 3.1 Flash-Lite$0.25 / $1.50 per 1M tokens
EverydayEmails, blog posts, long summaries, code edits, support repliesClaude Sonnet 5.5$2.00 / $10.00 per 1M tokensGPT-6.1 Terra$1.00 / $5.00 per 1M tokensGemini 3.8 Flash$0.75 / $3.75 per 1M tokens
Hard reasoningMulti-step analysis, complex code, strategy, mathClaude Opus 5.5$4.00 / $20.00 per 1M tokensGPT-6.1 Sol$2.00 / $10.00 per 1M tokensGemini 4 Argon$2.00 / $10.00 per 1M tokens
FrontierLong-running agent work and the hardest problems; rarely neededClaude Fable 5.1$10.00 / $50.00 per 1M tokensGPT-6 Astra$10.00 / $50.00 per 1M tokensNo frontier model; top is Gemini 4 Argon

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Choosing an AI model: ChatGPT, Claude and Gemini compared | PromptSaver