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Opper free tier

🧭 Aggregators (one key, many providers) · no card · live — last verified by a probe on 2026-11-01 · opper.ai · back to the whole list

What you get

EU-hosted model gateway advertising a free route before adding a card; current documentation conflicts on its availability

Free models

gemma-4-31b

Limits, in the vendor’s words

Advertised route; free access unconfirmed: Usage allowance: published sources disagree (period not published); scope not published

The signup guide advertises a free US-hosted Gemma route before adding a card, but the current directory has no free routes and its Gemma page lists paid alternatives. The API catalog retains the ID without a price or availability claim. Free access remains unconfirmed. Paid credit purchases add a 3% fee. Opper Technology AB operates in Sweden on AWS Stockholm.

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: “Opper never trains on your data. Per-provider data policies are listed in the models directory.” (source).

Connect

Base URL: https://api.opper.ai/v3/compat
Key: OPPER_API_KEY — get one at https://platform.opper.ai/settings/api-keys
Anthropic-format base (Claude Code’s ANTHROPIC_BASE_URL): https://api.opper.ai/v3/compat
Codex CLI: configs/codex/opper.config.toml — copy it to ~/.codex/, then codex -p opper; set up on the lane by the vendor’s own page, https://docs.opper.ai/integrations/coding-agents/codex: “Run OpenAI’s Codex CLI on any model in the Opper catalog”
Callable ids: gemini/gemma-4-31b
Note: The signup guide advertises gemini/gemma-4-31b as free before adding a card, but the model directory omits that route; availability is uncertain. For Claude Code, use ANTHROPIC_BASE_URL=https://api.opper.ai/v3/compat; the client appends /v1/messages.

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

curl -s https://api.opper.ai/v3/compat/chat/completions \
  -H "Authorization: Bearer $OPPER_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"model":"gemini/gemma-4-31b","messages":[{"role":"user","content":"2+2? MAKE NO MISTAKES."}]}'

Evidence

Probe: the page at https://opper.ai/llms.txt, anchored on gemini/gemma-4-31b is a free model, the free models work in the playground and the API; ids checked in https://api.opper.ai/v3/models?limit=0
Source: https://opper.ai/pricing.md
Source: https://opper.ai/llms.txt
Source: https://docs.opper.ai/guides/claude-code-router.md
Source: https://opper.ai/sign-up/free.md
Source: https://opper.ai/models
Source: https://opper.ai/google/gemma-4-31b-it.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: EU-hosted gateway over 700+ models whose free models — Gemma 4 31B and Gemma 4 26B on Google’s route, Laguna S 2.1 and XS 2.1 through Poolside — answer an account with no card on file; every other model needs a card and credits

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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