Step 3.5 Flash API Pricing & Quick Start
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
Technical specifications
Pricing comparison
BazaarLink retail price alongside AA's observed market standard.
BazaarLink price our site
Market reference Artificial Analysis
Independent benchmarks
Scores below come from Artificial Analysis, an independent third party. BazaarLink does not participate in the testing.
Top 5 — CodingCoding Index leaderboard
?/claude-fable-5-182$10 / $50?/claude-fable-5-1-xhigh81$10 / $50?/claude-fable-5-1-high79$10 / $50openai/gpt-5-6-sol-xhigh78$4 / $20anthropic/claude-opus-578$5 / $25Quick Start
Use Step 3.5 Flash via BazaarLink API — just change the base_url:
from openai import OpenAI
client = OpenAI(
base_url="https://api.bazaarlink.ai/v1",
api_key="sk-bl-YOUR_API_KEY",
)
response = client.chat.completions.create(
model="stepfun/step-3.5-flash",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.bazaarlink.ai/v1",
apiKey: "sk-bl-YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "stepfun/step-3.5-flash",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);Why use Step 3.5 Flash via BazaarLink?
- ✓USD billing (TWD-quoted) + unified invoices — no foreign credit card needed for Taiwan teams
- ✓OpenAI-compatible API — zero code changes required
- ✓Automatic failover — multi-provider redundancy for the same model
- ✓Chinese-language support — local team, instant help
Frequently Asked Questions
What is Step 3.5 Flash?
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
How much does the Step 3.5 Flash API cost?
Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens when accessed through BazaarLink.
How do I use Step 3.5 Flash with the OpenAI SDK?
Set base_url to "https://api.bazaarlink.ai/v1" and use model ID "stepfun/step-3.5-flash". All OpenAI SDK methods (chat.completions, embeddings, streaming) work without code changes.
What is the context window for Step 3.5 Flash?
Step 3.5 Flash supports a context window of 262,144 tokens.
Is Step 3.5 Flash available for free?
Step 3.5 Flash is a paid model. BazaarLink offers free trial credits on registration so you can test it without a credit card.
Relay integrity checks
No integrity-check data is available for this model yet.
BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.
View the full integrity report →Related models and links
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