When was Rune 26B-A4B released?

Invergent released Rune 26B-A4B on 22 Sep 2026. It is available through the Opper gateway.

Does Rune 26B-A4B support zero data retention?

Yes. Rune 26B-A4B is available with zero data retention on Fireworks through the Opper gateway.

Where is Rune 26B-A4B hosted?

See the per-route table for Rune 26B-A4B hosting locations and residency details.

Is Rune 26B-A4B trained on prompts and outputs?

No. Every hosting route for Rune 26B-A4B is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Rune 26B-A4B?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Rune 26B-A4B. Contact hello@opper.ai to receive it.

Rune 26B-A4B

by Invergent

Announcement · All Invergent releases

Rune 26B-A4B is a mixture-of-experts decision model from Invergent, the team behind Surogate. It evaluates a state against typed questions and returns probabilities instead of generated prose. Its question types include yes/no probability judgments, choices among named options and scores on an ordered scale. Use Rune for classification, routing and evaluation when an application needs a constrained answer with uncertainty attached. The maker documents text and image inputs; supported inputs and context limits depend on the serving endpoint.

Call Rune 26B-A4B on Opper through the System One evaluation API. Sign up without a credit card. Get started

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Key info

Input

Output

Features

Context window

262K

Input price

$0.04 /1M$0.0084 cache read

Released

22 Sep 2026

Zero data retention on pay-as-you-go
No training by default
GDPR DPA available

Available routes

Rune 26B-A4B runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Fireworks	Multi		No	$0.04	—	$0.0084

Live routes and prices as JSON: api.opper.ai/v3/models?q=fireworks%2Frune

Uptime and availability

Rune 26B-A4B runs on a single route through the Opper gateway today, so its availability is that provider's availability.

100%route uptime, last 30 days

Single route, no failover target within this model.

Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting Rune 26B-A4B has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Fireworks — Multi-region

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. GLOBAL; SCCs; DPA available.

Zero data retention: Yes. Nothing is logged, held for abuse monitoring or used for training.
Training: No training on customer data.
Logging: None
Abuse monitoring: On by default, keeps nothing
Subprocessor access: Subprocessors may read content
GDPR DPA: DPA available
Transfer mechanism: SCCs

Best for

The model directory pages that list Rune 26B-A4B.

Listed inDecision models

Get started

Call Rune 26B-A4B through the Opper gateway with one API key. Evaluate state against typed questions using TypeSafe’s System One API for yes/no decisions, classification, and rubric scoring.

See the Opper evaluation guide and the TypeSafe API reference for question types and response formats. Compare every decision model, on one API.

Rune 26B-A4B is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

1curl https://api.opper.ai/v3/compat/v1/systemone \
2  -H "Authorization: Bearer $OPPER_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "fireworks/rune",
6    "state": "The customer cannot sign in and needs help immediately.",
7    "questions": {
8      "is_urgent": {
9        "type": "noul",
10        "instructions": "Does the customer need urgent help?"
11      }
12    }
13  }'