Build advanced reasoning agents with Step 3.5 Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.10/1M input and $0.30/1M output tokens, native tool calling support, open weights architecture. Access Step 3.5 Flash via the OpenRouter API with up to 256K output tokens.
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Step 3.5 Flash by OpenRouter costs $0.10 per 1M input tokens and $0.30 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.