{"data":{"id":"stepfun/step-5-preview","provider_id":"stepfun","name":"StepFun: Step 5 Preview","modalities":["text","image","video"],"context_window":1048576,"family":"step-5-preview","status":"active","description":"Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...","architecture":{"modality":"text+image+video->text","input_modalities":["text","image","video"],"output_modalities":["text"],"tokenizer":"Other","instruct_type":null},"supported_parameters":["frequency_penalty","include_reasoning","logprobs","max_tokens","min_p","presence_penalty","reasoning","reasoning_effort","repetition_penalty","response_format","seed","stop","structured_outputs","temperature","tool_choice","tools","top_k","top_logprobs","top_p"],"created_at":1791462849,"canonical_slug":"stepfun/step-5-preview-20261008","catalog_source":"openrouter","host_id":"openrouter","host_name":"OpenRouter","creator_id":"stepfun","creator_name":"Stepfun","cheapest_provider":"gmicloud","cheapest_provider_name":"GMICloud","cheapest_price":1.425,"savings_pct":null,"savings_basis":null,"provider":{"id":"stepfun","name":"Stepfun","website":"https://openrouter.ai/stepfun","categories":["text","image","video"],"docs_url":"https://openrouter.ai/models","notes":"Live OpenRouter feed. Prices are OpenRouter list rates, not a contract with the origin lab.","role":"lab"},"prices":[{"id":59563,"model_id":"stepfun/step-5-preview","unit":"token","input_per_1m_usd":1,"output_per_1m_usd":2.7,"flat_usd":null,"currency":"USD","effective_at":"2026-10-16","source_url":"https://openrouter.ai/stepfun/step-5-preview","notes":"OpenRouter list rate. Token fields are USD per token converted to per 1M. Flat image, request, and web_search fields are USD per unit and are not rescaled. Cache read 0.1/1M.","last_verified_at":"2026-10-16T00:15:59.676Z","source":"openrouter","confidence":"official","cache_read_per_1m_usd":0.1,"cache_write_per_1m_usd":null,"cache_write_1h_per_1m_usd":null,"pricing_detail":null,"long_context_override":false}]}}