KymaKyma
StepFun

StepFun

Step 3.7 Flash

StepFun's fast flash tier. 256K context, multimodal input, tool calling. Cheap throughput.

Modalities

Text+Image → Text

Input

$0.27 /1M

Output

$1.55 /1M

Cached input

$0.03 /1M90% off

Context

256K

Speed

fast

Performance

Live production data from real requests on Kyma — not synthetic benchmarks.

Rank

#43

of 64 active models

Tokens served

2.0K

all-time

Total requests11
Platform share0.0%

Pricing

Pay per token. Cached input is billed at 10% of the input rate.

$0.27 /1M input$1.55 /1M output
Hobby10 req/day · 2K in / 500 out
~$0.39/mo
Production1,000 req/day · 2K in / 500 out
~$39.49/mo
Scale20,000 req/day · 2K in / 500 out
~$790/mo
+ Estimate your workload
1,000
2,000
500
30%

Estimated monthly cost

$35.17

$1.17 / day on Step 3.7 Flash

Same workload on:

Gemma 4 31B$19.44-45%
Gemini 2.5 Flash$74.92+113%

Estimates use list pricing with cached input billed at the 90%-discount rate. Actual bills depend on real token counts — every response includes its exact cost.

How it compares

Against the peers people actually weigh it against.

SpecStep 3.7 FlashGemma 4 31BGemini 2.5 Flash
Input /1M$0.27$0.19$0.41
Output /1M$1.55$0.54$3.38
Context256K128K1M
ToolsYesYesYes
ReasoningYesNoYes
Speedfastmediumfast

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-3.7-flash",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-3.7-flash",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

FAQ

Common questions about this model.

What is the context window of Step 3.7 Flash?

Step 3.7 Flash has a 256K-token context window — roughly 376 pages of text in a single request.

How much does the Step 3.7 Flash API cost?

$0.27 per 1M input tokens and $1.55 per 1M output tokens, with cached input at $0.03/1M — a 90% discount on repeated prompt prefixes. No subscription; you pay only for what you use.

Does Step 3.7 Flash support function calling?

Yes — Step 3.7 Flash supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

How do I use Step 3.7 Flash?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to step-3.7-flash. Signing up is free and includes $0.50 of credit — no card required.

Start with $0.50 free credit — no card required.Create account →

Related models

Google

Gemma 4 31B

$0.19/1M · 128K

Google

Gemini 2.5 Flash

$0.41/1M · 1M

OpenAI

GPT-OSS 120B

$0.20/1M · 128K