Compare GPT-5 Nano and Claude Haiku 4.5 across reasoning, coding, and cost. See which lightweight model fits your production stack—and test both directly through Portkey’s Prompt Playground or AI Gateway.

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GPT-5 Nano and Claude Haiku 4.5 represent two approaches to lightweight language models. GPT-5 Nano prioritizes extreme cost efficiency ($0.05 per million input tokens) and ultra-low latency, making it ideal for high-volume, simple tasks like chatbots and summarization. Claude Haiku 4.5 costs roughly 20-25× more but delivers stronger reasoning, coding performance, and multi-step logic capabilities. Benchmarks show Haiku 4.5 excels at agentic workflows and complex debugging, while Nano optimizes for speed over depth. In production, they can complement each other: Nano handles fast triage and simple requests, while Haiku 4.5 manages reasoning-heavy tasks requiring accuracy and structure.

Comparing lean LLMs: GPT-5 Nano and Claude Haiku 4.5

Comparing costs: GPT-5-nano vs Claude Haiku 4.5