Model Cost Profile

StepFun: Step 3.5 Flash (free)

Developer: stepfun

Pricing updated Mar 11, 2026

Input rank: #24Output rank: #24

Live Pricing

Input: $0.0000

Output: $0.0000

Get API Key View full pricing leaderboard

Pricing via OpenRouter API · Last synced Mar 11, 2026

StepFun: Step 3.5 Flash is a free API model developed by stepfun, designed for applications requiring extensive context handling with a remarkable capacity of 256,000 tokens. This model is particularly useful for large-scale text generation tasks, such as summarizing lengthy documents or creating detailed reports, without incurring any costs for input or output tokens. Teams leveraging this model can significantly reduce operational expenses while maximizing productivity, making it an ideal choice for organizations with high-volume text processing needs.

🔧 Tool Calling🧠 Reasoning

Context Window

256,000

Tokens

Input Price / 1M

$0.0000

Prompt tokens

Output Price / 1M

$0.0000

Completion tokens

Intelligence (MMLU)

Benchmark Pending

Massive Multitask Language Understanding

Side-by-Side Pricing Table

Usage Type	Price / 1M Tokens
Input (Prompt)	$0.0000
Output (Completion)	$0.0000

Compare with StepFun: Step 3.5 Flash Compare with Arcee AI: Trinity Large Preview (free)Compare with Arcee AI: Trinity Mini (free)

Price History

StepFun: Step 3.5 Flash (free) Pricing Trend

Input / 1M tokensOutput / 1M tokens

Mar 7 — Mar 11

Current Input / 1M

$0.000000

Current Output / 1M

$0.000000

Cost Calculator

Estimate monthly spend for StepFun: Step 3.5 Flash (free) based on your workload.

Input tokens / month

01.0B

Output tokens / month

0500M

Estimated Monthly Cost

$0.00

25M input + 12M output tokens

Same Workload on Other Models

Arcee AI: Trinity Large Preview (free)$0.00 Arcee AI: Trinity Mini (free)$0.00 Google: Gemma 3 12B (free)$0.00 Google: Gemma 3 27B (free)$0.00

Cheaper Alternatives to Compare

Quick links for cost-down decisions before production rollout.

StepFun: Step 3.5 Flash (free) vs Arcee AI: Trinity Large Preview (free)StepFun: Step 3.5 Flash (free) vs Arcee AI: Trinity Mini (free)StepFun: Step 3.5 Flash (free) vs Google: Gemma 3 12B (free)StepFun: Step 3.5 Flash (free) vs Google: Gemma 3 27B (free)

FAQ

Common pricing and benchmark questions for StepFun: Step 3.5 Flash (free).

How much does StepFun: Step 3.5 Flash (free) cost per 1M input tokens?

StepFun: Step 3.5 Flash (free) input pricing is $0.0000 per 1M tokens based on the latest synced provider data.

How much does StepFun: Step 3.5 Flash (free) cost per 1M output tokens?

StepFun: Step 3.5 Flash (free) output pricing is $0.0000 per 1M tokens based on the latest synced provider data.

What context window does StepFun: Step 3.5 Flash (free) support?

StepFun: Step 3.5 Flash (free) supports a context window of 256,000 tokens.

How can I compare StepFun: Step 3.5 Flash (free) with cheaper alternatives?

Use the comparison links on this page to open direct model-vs-model pricing and benchmark pages, then evaluate monthly spend projections for your workload.