AI Rate Card

Step 3.5 Flash · deepinfra

Step 3.5 Flash is an open-source reasoning model by StepFun with 196B total parameters (11B active) using Mixture of Experts. It features a 256K context window, deep reasoning, tool calling, and agentic capabilities, achieving 97.3 on AIME 2025 and 74.4% on SWE-bench Verified.

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Input, $/1M $0.09

Output, $/1M $0.30

Limits

  • Every plan: 200 requests at once

Last checked 04.11.2026 12:08:11 UTC Source

Context 262 144

Accepts —

Last checked 04.11.2026 12:00:14 UTC

Source —

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API

This model type has no common request format: see the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Adeepinfra%7Cstepfun-ai/Step-3.5-Flash, prices checked 2026-11-04

Technical details

ID: offer:deepinfra|stepfun-ai/Step-3.5-Flash