Step 3.5 Flash 2603 API Pricing

StepFun · released 2026-04-02

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

17.0

Intelligence
#150 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
Qwen3.5 122B A10B (Non-reasoning)	17.7	$1.10
Muse Glimmer (high)	17.5	$0.637
Ling-2.6-1T	17.0	$0.85
Step 3.5 Flash 2603	17.0	$0.15
Claude 4.5 Haiku (Reasoning)	16.9	$2.00
Doubao Seed Code	16.9	—
Gemma 4 26B A4B (Reasoning)	16.7	$0.179

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	16.6	$0.15
Step3 VL 10B	7.7	—

Count tokens & estimate cost for Step 3.5 Flash 2603 See Step 3.5 Flash 2603 on the leaderboard

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

FAQ

Who develops Step 3.5 Flash 2603?

Step 3.5 Flash 2603 is developed by StepFun, released 2026-04-02.

How much does Step 3.5 Flash 2603 cost per million tokens?

Step 3.5 Flash 2603 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 2603 rank on benchmarks?

Step 3.5 Flash 2603 scores 17.0 on the Artificial Analysis Intelligence Index, ranking #150 of 533 models we track.

Where does this data come from?

Pricing and benchmark data for Step 3.5 Flash 2603 comes from Artificial Analysis (artificialanalysis.ai), synced daily. Last synced 2026-09-22.