Build advanced reasoning agents with GPT-5 Nano, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.05/1M input and $0.40/1M output tokens, native tool calling support. Access GPT-5 Nano via the Abacus API with up to 128K output tokens.
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GPT-5 Nano by Abacus costs $0.05 per 1M input tokens and $0.40 per 1M output tokens.