StepFun: Step 3.5 Flash

Public pricingIntelligence 79/100Large memoryتفكير عميقاستخدام الأدوات

StepFun: Step 3.5 Flash هو نموذج نصي مخصص لـالدردشة العامة والتحليل والاستخدام الإنتاجي. يجمع بين زمن استجابة منخفض واستدلال فعّال، مرونة مفتوحة المصدر وسياق بحجم 262K tokens وملف منخفض التكلفة لتقديم عمل موثوق في general chat, analysis, and production workloads.

Input

$0.10/1M

Output

$0.30/1M

Cached

$0.01/1M

Batch

$0.07/1M

Calculate your Step 3.5 Flash bill.

Set your workload — see cost at your exact volume.

What would Step 3.5 Flash cost you?

Adjust the workload to see your monthly bill.

1,00010,00050,000250,0001M10M

Technical specifications

Step 3.5 Flash at a glance.

Memory

262,144

tokens

Max reply

65,536

tokens

Memory tier

Large

an entire book or large codebase

Tokenizer

—

Released

Jan 2026

Training cutoff

Oct 2025

Availability

Public pricing

Status

active

Benchmarks

Quality benchmarks

Independent evaluations from public leaderboards. Higher is better.

  • aa_intelligence_index

    38

  • livecodebench

    86.4

What it can do

Capabilities & limits.

  • Understands images
  • Deep step-by-step thinking
  • Uses tools / calls functions
  • Strict JSON output
  • Streams replies
  • Fine-tunable on your data

When to pick Step 3.5 Flash

  • Multi-step reasoning, research agents, or hard math.
  • Agentic workflows that call tools or APIs.
  • Long documents, full codebases, or extensive chat histories.
  • High-volume workloads where unit cost matters.

When to look elsewhere

  • Your workload involves images — pick a vision-capable model instead.

Alternatives

Similar models to compare.

FAQ

Step 3.5 Flash — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, Step 3.5 Flash costs roughly $20 per month. Input is $0.10 /1M tokens and output is $0.30 /1M tokens.
Step 3.5 Flash has a 262,144-token context window (large memory — an entire book or large codebase). That means you can fit about 49,152 words of input and history in a single call.
Beyond text generation, Step 3.5 Flash supports deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.
Step 3.5 Flash was released in January 2026, with training data cut off around October 2025.
Models in a similar class include Seed-2.0-Mini, Gemini 2.0 Flash, Gemini 2.5 Flash Lite. The "Similar models" section below this FAQ links into each.

Still unsure?

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