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Step 3.5 Flash API Pricing & Performance

step-3-5-flash

Also known as

Step-3.5-Flashstep-3.5-flashstep-3.5-flash-freestepfun-ai/Step-3.5-Flashstepfun-ai/step-3.5-flash

Step 3.5 Flash is available through 32 API providers on LMSpeed. Compare API pricing from $0.0002 to $75.00 per million input tokens across providers. Free API access is offered by 1 provider. In speed benchmarks, the fastest provider reaches 176 tok/s.

Avg speed

103.93t/s

First token

6.74s

Total tests

Providers

Variants

Pricing Comparison

Compare Step 3.5 Flash API pricing across 31 providers. Input prices range from $0.0002 to $75.00 per million input. 91VIP offers the lowest rate at $0.0002/M.

Provider	Model Variant	Input ($/M)	Output ($/M)	Speed (t/s)
OpenRouter Fans	stepfun/step-3.5-flash:free	Free	Free	—
91VIP	step-3.5-flash	$0.0002	$0.0001	—
Futureppo	step-3.5-flash	$0.0002	$0.0001	—
素墨API	step-3.5-flash	$0.010	$0.010	—
素墨API	stepfun-ai/step-3.5-flash	$0.010	$0.010	—
uglycat	stepfun/step-3.5-flash:free	$0.010	$0.010	—
352287 API	stepfun/step-3.5-flash	$0.100	$0.300	—
星见雅 API	李/stepfun-ai/step-3.5-flash	$0.100	$0.100	—
Seamee API	stepfun-ai/Step-3.5-Flash	$0.100	$0.300	—
Seamee API	stepfun/step-3.5-flash	$0.100	$0.300	—
OpenRouter Fans	stepfun-ai/Step-3.5-Flash	$0.100	$0.300	—
OpenRouter Fans	stepfun/step-3.5-flash	$0.100	$0.300	—
Seamee API	stepfun-ai/step-3.5-flash	$0.200	$0.500	—
MapleLeaf API	stepfun-ai/step-3.5-flash	$0.200	$0.500	—
人人 API	step-3.5-flash	$0.300	$0.500	—
SWT-API	step-3.5-flash	$0.375	$0.375	—
天絮 API	Step-3.5-Flash	$0.700	$2.10	—
钱多多 API	stepfun-ai/Step-3.5-Flash	$0.700	$2.10	—
百万API	step-3.5-flash	$1.00	$1.00	—
Synapse	step-3.5-flash	$1.00	$1.00	—

Showing 20 of 32 providers.

Pricing data from provider public APIs

Free Step 3.5 Flash API Tier & Credits

Step 3.5 Flash is free to use through 1 provider with no per-token charges. These providers offer free API credits or a free tier:

Provider	Speed (t/s)
OpenRouter Fans	—

API Speed Benchmarks by Provider

Compare speed and latency performance across all API providers.

Showing 1-6 of 6 providers

Most tested Recently tested A–Z

Provider	Speed	Latency	Tests
云智API Step-3.5-Flash	175.60 tok/s	6.15s	10
OpenRouter stepfun/step-3.5-flash:free	100.35 tok/s	6.82s	40
SiliconFlow stepfun-ai/Step-3.5-Flash	84.22 tok/s	3.37s	5
NVIDIA NIM stepfun-ai/step-3.5-flash	81.82 tok/s	4.79s	10
国产大模型 API step-3.5-flash	79.82 tok/s	11.79s	5
Kilo stepfun/step-3.5-flash:free	77.22 tok/s	9.54s	5

Recent API Speed Tests

20 records

Latest benchmark results measuring API response speed and first-token latency.

Time	Model	Speed	Latency
04/10/2026, 05:41	step-3.5-flash	89.68 tok/s	5.66s
04/10/2026, 05:41	step-3.5-flash	50.12 tok/s	16.78s
04/10/2026, 05:41	step-3.5-flash	47.01 tok/s	7.00s
04/10/2026, 05:41	step-3.5-flash	4.83 tok/s	26.07s
04/10/2026, 05:41	step-3.5-flash	207.45 tok/s	3.43s
04/07/2026, 06:22	stepfun/step-3.5-flash:free	73.36 tok/s	5.58s
04/07/2026, 06:22	stepfun/step-3.5-flash:free	62.34 tok/s	6.43s
04/07/2026, 06:22	stepfun/step-3.5-flash:free	79.82 tok/s	13.46s
04/07/2026, 06:22	stepfun/step-3.5-flash:free	76.15 tok/s	4.56s
04/07/2026, 06:22	stepfun/step-3.5-flash:free	99.94 tok/s	3.42s
04/06/2026, 06:22	stepfun-ai/step-3.5-flash	82.37 tok/s	6.63s
04/06/2026, 06:22	stepfun-ai/step-3.5-flash	43.46 tok/s	1.92s
04/06/2026, 06:22	stepfun-ai/step-3.5-flash	28.32 tok/s	18.64s
04/06/2026, 06:22	stepfun-ai/step-3.5-flash	16.72 tok/s	1.58s
04/06/2026, 06:22	stepfun-ai/step-3.5-flash	53.01 tok/s	5.54s
04/05/2026, 13:51	stepfun-ai/Step-3.5-Flash	87.98 tok/s	3.65s
04/05/2026, 13:51	stepfun-ai/Step-3.5-Flash	91.73 tok/s	3.10s
04/05/2026, 13:51	stepfun-ai/Step-3.5-Flash	79.56 tok/s	4.14s
04/05/2026, 13:51	stepfun-ai/Step-3.5-Flash	75.16 tok/s	2.54s
04/05/2026, 13:51	stepfun-ai/Step-3.5-Flash	86.67 tok/s	3.45s

See all free LLM models →

Frequently Asked Questions

Is Step 3.5 Flash API free?: Yes, Step 3.5 Flash is available for free through 1 API provider on LMSpeed, including OpenRouter Fans. These providers offer free API credits or a free tier with no per-token charges.
How much does Step 3.5 Flash API cost?: Step 3.5 Flash API pricing ranges from $0.0002 to $75.00 per million input tokens across 32 providers. 91VIP offers the cheapest rate at $0.0002/M. Output pricing varies by provider.
Which provider has the cheapest Step 3.5 Flash API pricing?: The cheapest Step 3.5 Flash API pricing is offered by 91VIP at $0.0002 per million input tokens. Compare all 32 providers above to find the best pricing per token for your use case.

Related Models to Compare

MiniMax-M2.5minimax-m2-5

23 shared providers

DeepSeek V3.2deepseek-v3-2

Pricing Comparison

Compare Step 3.5 Flash API pricing across 31 providers. Input prices range from $0.0002 to $75.00 per million input. 91VIP offers the lowest rate at $0.0002/M.

Provider	Model Variant	Input ($/M)	Output ($/M)	Speed (t/s)
OpenRouter Fans	stepfun/step-3.5-flash:free	Free	Free	—
91VIP	step-3.5-flash	$0.0002	$0.0001	—
Futureppo	step-3.5-flash	$0.0002	$0.0001	—
素墨API	step-3.5-flash	$0.010	$0.010	—
素墨API	stepfun-ai/step-3.5-flash	$0.010	$0.010	—
uglycat	stepfun/step-3.5-flash:free	$0.010	$0.010	—
352287 API	stepfun/step-3.5-flash	$0.100	$0.300	—
星见雅 API	李/stepfun-ai/step-3.5-flash	$0.100	$0.100	—
Seamee API	stepfun-ai/Step-3.5-Flash	$0.100	$0.300	—
Seamee API	stepfun/step-3.5-flash	$0.100	$0.300	—
OpenRouter Fans	stepfun-ai/Step-3.5-Flash	$0.100	$0.300	—
OpenRouter Fans	stepfun/step-3.5-flash	$0.100	$0.300	—
Seamee API	stepfun-ai/step-3.5-flash	$0.200	$0.500	—
MapleLeaf API	stepfun-ai/step-3.5-flash	$0.200	$0.500	—
人人 API	step-3.5-flash	$0.300	$0.500	—
SWT-API	step-3.5-flash	$0.375	$0.375	—
天絮 API	Step-3.5-Flash	$0.700	$2.10	—
钱多多 API	stepfun-ai/Step-3.5-Flash	$0.700	$2.10	—
百万API	step-3.5-flash	$1.00	$1.00	—
Synapse	step-3.5-flash	$1.00	$1.00	—

Showing 20 of 32 providers.

Pricing data from provider public APIs

Provider

Speed (t/s)

OpenRouter Fans

—

Provider

Speed

Latency

Tests

云智API

Step-3.5-Flash

175.60 tok/s

6.15s

OpenRouter

stepfun/step-3.5-flash:free

100.35 tok/s

6.82s

SiliconFlow

stepfun-ai/Step-3.5-Flash

84.22 tok/s

3.37s

NVIDIA NIM

stepfun-ai/step-3.5-flash

81.82 tok/s

4.79s

国产大模型 API

step-3.5-flash

79.82 tok/s

11.79s

Kilo

stepfun/step-3.5-flash:free

77.22 tok/s

9.54s

Time

Model

Speed

Latency

04/10/2026, 05:41

step-3.5-flash

89.68 tok/s

5.66s

04/10/2026, 05:41

step-3.5-flash

50.12 tok/s

16.78s

04/10/2026, 05:41

step-3.5-flash

47.01 tok/s

7.00s

04/10/2026, 05:41

step-3.5-flash

4.83 tok/s

26.07s

04/10/2026, 05:41

step-3.5-flash

207.45 tok/s

3.43s

04/07/2026, 06:22

stepfun/step-3.5-flash:free

73.36 tok/s

5.58s

04/07/2026, 06:22

stepfun/step-3.5-flash:free

62.34 tok/s

6.43s

04/07/2026, 06:22

stepfun/step-3.5-flash:free

79.82 tok/s

13.46s

04/07/2026, 06:22

stepfun/step-3.5-flash:free

76.15 tok/s

4.56s

04/07/2026, 06:22

stepfun/step-3.5-flash:free

99.94 tok/s

3.42s

04/06/2026, 06:22

stepfun-ai/step-3.5-flash

82.37 tok/s

6.63s

04/06/2026, 06:22

stepfun-ai/step-3.5-flash

43.46 tok/s

1.92s

04/06/2026, 06:22

stepfun-ai/step-3.5-flash

28.32 tok/s

18.64s

04/06/2026, 06:22

stepfun-ai/step-3.5-flash

16.72 tok/s

1.58s

04/06/2026, 06:22

stepfun-ai/step-3.5-flash

53.01 tok/s

5.54s

04/05/2026, 13:51

stepfun-ai/Step-3.5-Flash

87.98 tok/s

3.65s

04/05/2026, 13:51

stepfun-ai/Step-3.5-Flash

91.73 tok/s

3.10s

04/05/2026, 13:51

stepfun-ai/Step-3.5-Flash

79.56 tok/s

4.14s

04/05/2026, 13:51

stepfun-ai/Step-3.5-Flash

75.16 tok/s

2.54s

04/05/2026, 13:51

stepfun-ai/Step-3.5-Flash

86.67 tok/s

3.45s

Frequently Asked Questions

Is Step 3.5 Flash API free?

Yes, Step 3.5 Flash is available for free through 1 API provider on LMSpeed, including OpenRouter Fans. These providers offer free API credits or a free tier with no per-token charges.

How much does Step 3.5 Flash API cost?

Step 3.5 Flash API pricing ranges from $0.0002 to $75.00 per million input tokens across 32 providers. 91VIP offers the cheapest rate at $0.0002/M. Output pricing varies by provider.

Which provider has the cheapest Step 3.5 Flash API pricing?

The cheapest Step 3.5 Flash API pricing is offered by 91VIP at $0.0002 per million input tokens. Compare all 32 providers above to find the best pricing per token for your use case.