What is the cheapest StepFun model?

Step 3.5 Flash is the lowest blended-price option among tracked active non-embedding models, or among all models if only embeddings are listed: $0.10 input and $0.30 output per million tokens ($0.15 blended). Blended pricing uses 75% input and 25% output for generation models; your cheapest option may differ with your workload.

Which StepFun model has the highest AA Intelligence score?

No Artificial Analysis Intelligence Index results are currently listed for StepFun. Missing results do not establish that a model is worse than a scored model.

How do I calculate monthly StepFun API costs?

Multiply input tokens in millions by the input rate and add output tokens in millions multiplied by the output rate. For example, 20 million input and 5 million output tokens on Step 3.5 Flash cost an estimated $3.50 at the listed rates. This excludes tool charges, cache-specific charges, taxes and any endpoint-specific adjustments.

Which StepFun model has the largest context window?

Step 5 Preview has a listed context window of 1M tokens, the largest among tracked active StepFun models. Context capacity and maximum response length are separate limits; verify both on the model page and in the endpoint documentation.

What is the latest StepFun model in the catalog?

Step 5 Preview has the most recent listed release date among tracked active StepFun models: 2026-10-08. Models without a usable release date are excluded from this comparison. Catalog release dates do not guarantee immediate API availability.

Do StepFun models support image inputs?

2 tracked active models list image inputs, including Step 3.7 Flash, Step 5 Preview. Accepting images does not mean a model generates images; check each model's separate input and output formats and endpoint limits.

Can prompt caching lower StepFun API costs?

2 tracked active models have a listed cached-input rate, including Step 3.7 Flash, Step 5 Preview. Savings depend on eligible repeated input and the endpoint's cache rules, duration and any write charges.

Do StepFun models support tool calling?

3 tracked active models list tool-calling capabilities, including Step 3.5 Flash, Step 3.7 Flash, Step 5 Preview. Verify the exact tool schema and availability with your API endpoint before integrating.

How should I compare StepFun benchmark scores and prices?

Compare scores within the same evaluation: Artificial Analysis Intelligence Index, DesignArena Elo, general Arena Elo and MMLU-Pro use different tasks and scales. Missing results are not zeroes. Pair a relevant measured benchmark with input/output pricing and tests of your own workload; the cheapest or highest-scoring model is not automatically the best fit.

Are retired StepFun models included in the price list?

The price list shows active models by default. Turn on Show retired models to include retired catalog entries, where available. A retained model page preserves reference information, not a promise that its API is still available.

Is StepFun an AI lab or an inference host?

StepFun is categorized as an inference host in this catalog. Hosts provide access to models; check each model page for its creator and listed endpoints.

Inference host

StepFun API pricing & models

platform.stepfun.ai

We track 3 StepFun models, priced from $0.10 per 1M input tokens with context windows up to 1M tokens.

Models tracked

Text & Reasoning · Vision

$0.15

Cheapest model

Step 3.5 Flash

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Top quality score

Largest context

6-mo price trend 0%

Overview

About StepFun

Terms

Price list

All StepFun models and prices

Current StepFun API prices per 1M tokens, context windows and benchmark scores. Click a column to sort, or a model for full pricing details.

Show retired models


Step 3.5 Flash StepFun	$0.1	$0.3	262K	—	—	—	—	0%
Step 3.7 Flash StepFun	$0.2	$1.15	262K	—	—	—	—	0%
Step 5 Preview StepFun	$1	$2.7	1M	—	—	—	—	0%

Step 3.5 Flash StepFun

Input /1M: $0.1
Output /1M: $0.3
Context: 262K
AA Intelligence: —
DesignArena Elo: —
Arena Elo: —
MMLU-Pro: —
30d trend: 0%

Step 3.7 Flash StepFun

Input /1M: $0.2
Output /1M: $1.15
Context: 262K
AA Intelligence: —
DesignArena Elo: —
Arena Elo: —
MMLU-Pro: —
30d trend: 0%

Step 5 Preview StepFun

Input /1M: $1
Output /1M: $2.7
Context: 1M
AA Intelligence: —
DesignArena Elo: —
Arena Elo: —
MMLU-Pro: —
30d trend: 0%

StepFun input vs output prices

USD per 1M tokens for each model.

StepFun price history

Blended price per 1M tokens over the last 6 months.

By use case

StepFun models by category

Text & Reasoning

3 models · cheapest

Step 3.5 Flash

$0.15 blended / 1M

Vision

2 models · cheapest

Step 3.7 Flash

$0.44 blended / 1M

FAQ

StepFun pricing FAQ

Tracked active StepFun models range from $0.10 to $1.00 per million input tokens. Output rates are listed separately for each model. Prices vary by model and API endpoint; these are token rates, not a subscription quote.