Step 3.5 Flash API Pricing

StepFun · released 2026-02-02

Pricing

$0.10

input / 1M tokens
0.010¢ / 1K

$0.30

output / 1M tokens
0.030¢ / 1K

$0.15

blended / 1M tokens
0.015¢ / 1K

What it actually costs

Workload	Tokens	Cost
Short chat reply	500 in / 300 out	0.014¢
RAG query	4,000 in / 500 out	0.055¢
Long document summary	50,000 in / 1,000 out	0.53¢
Code review of a 2k-line file	30,000 in / 2,000 out	0.36¢
1,000 chat replies/day for 30 days	30,000 × (500 in / 300 out)	$4.20

Cost = (input tokens ÷ 1,000,000 × $0.10) + (output tokens ÷ 1,000,000 × $0.30).

Benchmarks

16.6

Intelligence
#159 of 533

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Coding

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Math

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Tokens/sec

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Time to first token

Leaderboard neighbours

Model	Intelligence	Blended $/1M
Claude 4 Sonnet (Non-reasoning)	16.6	—
DeepSeek V3.2 Exp (Reasoning)	16.6	$0.315
Ring-2.6-1T	16.6	$0.85
Step 3.5 Flash	16.6	$0.15
Qwen3 Max Thinking (Preview)	16.3	$2.40
Gemini 2.5 Pro	16.1	$3.438
DeepSeek V3.2 (Non-reasoning)	16.0	$0.315

More from StepFun

Model	Intelligence	Blended $/1M
Step 5 Preview	43.7	$1.425
Step 3.7 Flash	19.5	$0.438
Step 3.5 Flash 2603	17.0	$0.15
Step3 VL 10B	7.7	—

Count tokens & estimate cost for Step 3.5 Flash See Step 3.5 Flash on the leaderboard

Source: Artificial Analysis · last synced 2026-09-22

FAQ

Who develops Step 3.5 Flash?

Step 3.5 Flash is developed by StepFun, released 2026-02-02.

How much does Step 3.5 Flash cost per million tokens?

Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens ($0.15 blended), per Artificial Analysis's official pricing data.

How does Step 3.5 Flash rank on benchmarks?

Step 3.5 Flash scores 16.6 on the Artificial Analysis Intelligence Index, ranking #159 of 533 models we track.

Where does this data come from?

Pricing and benchmark data for Step 3.5 Flash comes from Artificial Analysis (artificialanalysis.ai), synced daily. Last synced 2026-09-22.