SiliconFlow alternative: same open models, price per million tokens

Synap402 is an OpenAI-compatible API for open-weight models. Point any OpenAI SDK at https://synap402.com/v1, start on the free tier, no card, then pay per token from credits, or pay per call in USDC with x402 and no account.

On every model on this page, Synap402 lists a lower input price and a lower output price than SiliconFlow in the index generated 2026-11-15 04:24 UTC.

Context windows differ: Synap402 has the smaller context window on 5 of 5 (Qwen3 Coder 30B, gpt-oss-20b, Gemma 4 26B, Qwen3 VL 30B and Qwen3 30B A3B Instruct 2507). Check the Context column before you switch a long-context workload.

USD per 1M tokens, list prices. SiliconFlow's row per model is its cheapest endpoint listed in the OpenRouter endpoints API; Synap402's is read from /v1/models, which is what the gateway bills. Cached-input, batch and volume discounts are not compared. Index generated 2026-11-15 04:24 UTC; data: price-index.json (CC BY 4.0). Every provider for each model: compare.

How to switch

Change two things in your OpenAI-compatible client: the base URL and the API key. Then use the Synap402 model id.

from openai import OpenAI

client = OpenAI(
    base_url="https://synap402.com/v1",     # was your current provider's base URL
    api_key="sk-pool-...",                  # your Synap402 API key
)
r = client.chat.completions.create(
    model="qwen3-coder-30b",
    messages=[{"role": "user", "content": "Hello"}],
)
print(r.choices[0].message.content)

Synap402 model ids for the models on this page, as /v1/models lists them:

• qwen3-coder-30b
• gpt-oss-20b
• gemma-4-26b-a4b-it
• qwen/qwen3-vl-30b-a3b-instruct
• qwen/qwen3-30b-a3b-instruct-2507

Prices for every model: pricing · all providers side by side: compare.

Questions

Is Synap402 cheaper than SiliconFlow?

On all 5 models both of us list (Qwen3 Coder 30B, gpt-oss-20b, Gemma 4 26B, Qwen3 VL 30B and Qwen3 30B A3B Instruct 2507), Synap402 has the lower input and output price in the index generated 2026-11-15 04:24 UTC.

Do I need to change my code to switch from SiliconFlow?

If your code uses an OpenAI-compatible client, change the base URL to https://synap402.com/v1, use a Synap402 API key and use the Synap402 model id from the table. Requests and responses follow the OpenAI chat completions format.

Where do these prices come from?

Synap402 prices are read from https://synap402.com/v1/models, which is what the gateway bills. SiliconFlow prices are its public list prices as reported by the OpenRouter endpoints API, one row per provider and model: its cheapest listed endpoint. The index is rebuilt every day; this page uses the index generated 2026-11-15 04:24 UTC.

Can I try Synap402 without a card?

Yes. The free tier needs no card. The free tier page shows whether it is open right now, which model it covers and its current daily allowance. Beyond that you pay per token from credits, or per call in USDC on Base with x402, without an account.

More comparisons

• Qwen3 Coder 30B API pricing
• gpt-oss-20b API pricing
• Gemma 4 26B API pricing
• Qwen3 VL 30B API pricing
• Qwen3 30B A3B Instruct 2507 API pricing
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