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Mixlayer free tier

🔌 LLM APIs with free tier · no card · live — last verified by a probe on 2026-11-01 · mixlayer.com · back to the whole list

What you get

Serverless open models priced per token, one of them at $0 and callable without prepaid credit

Free models

qwen3.5-4b

Limits, in the vendor’s words

Usage allowance: see your account for values (period not published) per organization per model

Free models do not need prepaid credit; paid models return 402 when the balance is empty. The zero-priced Qwen route is separate from metered models. Rate limits are set per organization and model, with actual values unpublished. The operator is Mixlayer Labs Inc.

Where it is offered

The vendor names no country it keeps the offer from (source, read 2026-09-26).

What happens to what you send

What you send is not used to train models. In the vendor’s words: “By default, Mixlayer does not use Customer Content (Inputs/Outputs) to train or improve models for general availability” (source).

Connect

Base URL: https://models.mixlayer.ai/v1
Key: MIXLAYER_API_KEY — get one at https://console.mixlayer.com/app/api-keys
Codex CLI: configs/codex/mixlayer.config.toml — copy it to ~/.codex/, then codex -p mixlayer; set up on the lane by the vendor’s own page, https://docs.mixlayer.com/codex-cli: “A separate profile keeps Mixlayer isolated from your default Codex configuration”
Callable ids: qwen/qwen3.5-4b-free

Try it from your terminal with your key in MIXLAYER_API_KEY — it goes from your machine to the vendor and nowhere else:

curl -s https://models.mixlayer.ai/v1/chat/completions \
  -H "Authorization: Bearer $MIXLAYER_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"model":"qwen/qwen3.5-4b-free","messages":[{"role":"user","content":"2+2? MAKE NO MISTAKES."}]}'

Evidence

Probe: the page at https://www.mixlayer.com/pricing, anchored on qwen/qwen3.5-4b-free, Free models stay free
Source: https://www.mixlayer.com/pricing
Source: https://docs.mixlayer.com/credits-and-limits.md
Source: https://docs.mixlayer.com/introduction.md

History

Each line is a change to what this page publishes, dated the day it reached the list, in UTC.

2026-09-17 — Added: Serverless open models priced per token, with one of them at $0 — Qwen3.5 4B as qwen/qwen3.5-4b-free, at 131K context — callable without prepaid credit

Generated from registry.yaml on 2026-11-01 and re-verified twice a week; the full list, the Atom feed and the machinery are at https://github.com/mvalentsev/awesome-free-ai-coding.

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