Free API — pricing & specs

Free is a text model available through KeepRouter under the model ID "free". On KeepRouter, Free is free — you pay $0 per token, with no monthly fee. Call it through a compatible KeepRouter endpoint supported by its active route, with the model id free.

How pricing works for Free

Free is a free tier — both input and output are billed at $0 per token, so calls cost nothing. It is best-effort and intended for testing, prototyping, and evaluation; use a paid model for production traffic. There is no monthly fee.

Calling Free on KeepRouter

Point a compatible client at the supported KeepRouter endpoint and set the model to free. KeepRouter preserves the client-facing request shape while handling upstream routing or translation. Use POST /v1/chat/completions or, on compatible chat routes, POST /v1/messages; streaming and tool support depend on the model's active route.

cURL

curl https://keeprouter.com/v1/chat/completions \
  -H "Authorization: Bearer $KEEPROUTER_KEY" -H "Content-Type: application/json" \
  -d '{"model":"free","messages":[{"role":"user","content":"Hello"}]}'

Python

from openai import OpenAI
client = OpenAI(base_url="https://keeprouter.com/v1", api_key="$KEEPROUTER_KEY")
r = client.chat.completions.create(model="free", messages=[{"role":"user","content":"Hello"}])

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://keeprouter.com/v1", apiKey: process.env.KEEPROUTER_KEY });
const r = await client.chat.completions.create({ model: "free", messages: [{ role: "user", content: "Hello" }] });

Verification boundary

KeepRouter's live catalog is authoritative for the customer price, model id, modality, and enabled endpoint shown here. Unlisted upstream capabilities or limits are not inferred.

Guides

• Call Free with the OpenAI SDK
• Use Free in Claude Code

Related models

• Gemini 3.5 Flash by Google DeepMind — $1.50 per 1M input tokens and $9.00 per 1M output tokens
• Doubao 2.0 Pro by ByteDance — $1.60 per 1M input tokens and $8.00 per 1M output tokens
• Gemma 4 31B by Google DeepMind — $0.1200 per 1M input tokens and $0.3500 per 1M output tokens
• Doubao 2.0 Mini by ByteDance — $0.1500 per 1M input tokens and $1.50 per 1M output tokens
• GLM-4.5 by Zhipu AI — $0.6000 per 1M input tokens and $2.20 per 1M output tokens
• Doubao 1.5 Pro by ByteDance — $0.2500 per 1M input tokens and $0.6000 per 1M output tokens

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Catalog facts and prices last changed 2026-08-01.