How much does Step 2 (16K) cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, Step 2 (16K) costs about $4,029 per month at StepFun's list prices ($5.21 per 1M input tokens, $16.44 per 1M output tokens).

Does Step 2 (16K) support prompt caching?

Yes. Cached input costs $1.04 per 1M tokens, compared with $5.21 for regular input.

How long is Step 2 (16K)'s context window?

Step 2 (16K) accepts up to 16,384 tokens (16K) of context and returns up to 8,192 tokens per response.

Step 2 (16K) API Pricing

StepFun · released Jan 1, 2025 · 16K context · API model ID step-2-16k

Step 2 (16K) by StepFun API pricing: $5.21 per 1M input tokens and $16.44 per 1M output tokens (provider list price via models.dev, Oct 10, 2026).

Prices

Step 2 (16K) prices, USD per 1M tokens
Price	USD per 1M tokens
Input	$5.21
Output	$16.44
Cache read	$1.04
Cache write	Not published

StepFun's list price for its own API, as compiled by models.dev and checked Oct 10, 2026, 09:00 UTC. Prices on cloud platforms and resellers can differ. Provider documentation

Estimated monthly cost

$4,029

per month

per day: $134.30
per request: $0.0134

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Compare this workload across models

Monthly cost by workload

Workload	Per month
Chatbot1,000 in / 500 out tokens, 10,000 requests a day	$4,029/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$7,485/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$3,797/mo

Context and capabilities

Context: 16,384 tokens
Max output: 8,192 tokens
Input: text
Output: text
Knowledge cutoff: June 2024
Open weights: No
Tool calling: Yes
Reasoning: No
Structured outputs: No

Capabilities and limits as listed by models.dev.

Similarly priced models

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Gemini 3.1 Pro Preview · $2.00 in / $12.00 out
Claude Sonnet 5.5 · $2.00 in / $10.00 out

Price history

No price changes since we started tracking on Oct 8, 2026.

Questions

How much does Step 2 (16K) cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, Step 2 (16K) costs about $4,029 per month at StepFun's list prices ($5.21 per 1M input tokens, $16.44 per 1M output tokens).
Does Step 2 (16K) support prompt caching?: Yes. Cached input costs $1.04 per 1M tokens, compared with $5.21 for regular input.
How long is Step 2 (16K)'s context window?: Step 2 (16K) accepts up to 16,384 tokens (16K) of context and returns up to 8,192 tokens per response.