Model Details
About
Baidu: ERNIE 4.5 21B A3B Thinking is a chat model built by Baidu. It accepts up to 131K tokens of context per request. Routed through external models — ~133 tokens per message (50% markup over upstream cost).
Use via API
curl https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"baidu/ernie-4.5-21b-a3b-thinking"}'
Compare
FAQ
Baidu: ERNIE 4.5 21B A3B Thinking is a chat model built by Baidu. It accepts up to 131K tokens of context per request. Routed through external models — ~133 tokens per message (50% markup over upstream cost).
Baidu: ERNIE 4.5 21B A3B Thinking works well for general conversation, writing assistance, brainstorming, code help, and analysis. Try the sample prompts above to see its style.
About 133 tokens per average message. $1 buys 750,000 tokens, so even paid models cost cents per chat. Free accounts get 10,000 signup tokens plus a daily pool.
It depends on the task. /chat/compare/ lets you send the same prompt to Baidu: ERNIE 4.5 21B A3B Thinking and any other model side-by-side — comparison is the fastest way to decide.
Yes. Outputs are yours — Free.ai does not claim rights to anything you generate.
131,072 tokens.
Replies stream token-by-token within ~1 second. Total response time depends on length and model size — small models stream faster, frontier models trade speed for depth.
Yes. Signed-in users see every chat in /account/?tab=history. You can also share a one-link copy of any conversation via the Share button.
Free.ai does not train models on your conversations. Self-hosted models stay on our GPUs. Premium models route to the upstream provider for inference.
Yes. POST to /v1/chat/ with model="baidu/ernie-4.5-21b-a3b-thinking" and a messages array. Streaming SSE is supported. Full reference: /api/.
Baidu: ERNIE 4.5 21B A3B Thinking is a premium model served by an external provider, so self-hosting is not available. Free.ai exposes it through token-based pricing.
Free accounts get 10,000 signup tokens plus a daily pool. When that runs out, top up starting at $1 (750K tokens) — no subscription required.