StepFun route
step-3.7-flash
Step 3.7 Flash API pricing.
One OpenAI-compatible route at the vendor list price with 0% markup, billed per token from one prepaid balance. No subscription required.
Input / 1M tokens
$0.20
Output / 1M tokens
$1.15
Cached input / 1M tokens
$0.03
Context window
256K
Provider
StepFun
Workload calculator
Put the token rate into context.
These examples apply the published input and output rates directly. Actual cost follows the exact tokens your client sends and the model returns.
This route is the 13th cheapest of 63 comparable text models and cheaper than 50 on the same key. Its context window ranks 57th of 63.
Short request
$0.0032
10K input + 1K output
Agent turn
$0.032
100K input + 10K output
Exact token billing
No request minimum
One model ID change
OpenAI compatible
Cost neighbourhood
Nearby routes, same workload.
Every comparison uses the same 100K-input / 10K-output turn. Changing route is a one-line model ID edit.
Price does not measure task quality. For generation routes, see GPT Image 2.
First request
Route it in one call.
Use any OpenAI SDK or tool. Keep the request shape, point the base URL at RouterPlex, and set the model ID shown here.
Read the quickstartcurl https://api.routerplex.com/v1/chat/completions \-H "Authorization: Bearer $ROUTERPLEX_API_KEY" \-H "Content-Type: application/json" \-d '{"model": "step-3.7-flash","messages": [{"role": "user", "content": "Hello!"}]}'
Route notes
Questions before production traffic.
01How much does the Step 3.7 Flash API cost?+
Through RouterPlex, Step 3.7 Flash costs $0.20 per 1M input tokens and $1.15 per 1M output tokens — the vendor list price with 0% markup, billed per token from a prepaid balance you top up from $5. Cached input tokens are billed at $0.03 per 1M instead of the full input rate, which is most of the prompt on a repeated agent or coding loop.
02What does one Step 3.7 Flash agent turn cost?+
A 100K-token input with a 10K-token reply costs about $0.032 on Step 3.7 Flash. That makes it the 13th cheapest of 63 comparable text models on RouterPlex, roughly 2.9× the cost of the cheapest option (DeepSeek V4 Flash).
03What is a cheaper alternative to Step 3.7 Flash?+
DeepSeek V4 Flash Vision from DeepSeek is the closest cheaper model on RouterPlex — $0.029 per agent turn against $0.032 for Step 3.7 Flash, at $0.22/1M input and $0.66/1M output. Both run on the same key and the same endpoint, so switching is a one-line model ID change.
04Is Step 3.7 Flash cheaper than GPT-5.6 Luna?+
Yes. Per agent turn, Step 3.7 Flash costs about $0.032 against $0.032 for GPT-5.6 Luna — 2% less.
05What is the context window of Step 3.7 Flash?+
Step 3.7 Flash supports a 256K token context window on RouterPlex, the 57th largest of the 63 models that publish one.
06Can I use Step 3.7 Flash with the OpenAI SDK?+
Yes. RouterPlex serves Step 3.7 Flash through an OpenAI-compatible endpoint at https://api.routerplex.com/v1 — point any OpenAI SDK or tool at that base URL with your RouterPlex key and set model to "step-3.7-flash".
Deploy this route
Put Step 3.7 Flash behind one key.
Top up from $5 with no subscription required.