01Memory
Memory that compounds.
Typed, temporal memory stores decisions, references, feedback, and artifacts so agents start with context instead of rediscovering it.
Turn model calls
into managed
agent workflows.
Arbiter is a workspace and open runtime for supervised agent workflows: live-streamed execution, durable memory, artifacts, and usage controls.
Supported providers and models
- Claude Opus 4.7
- Claude Sonnet 4.6
- Claude Haiku 4.5
- GPT-5.5
- GPT-5.4
- GPT-5.4 mini
- o4-mini
- Gemini 3.1 Pro
- Gemini 3 Flash
- Gemini 3.1 Flash-Lite
- Nano Banana 2
- Nano Banana Pro
- nemotron3
- qwen3.6
- kimi-k2.6
- granite4.1
02Supervision
Supervision the agent can't bypass.
Advisor gates run at the runtime layer. Final answers can continue, redirect, or halt before they reach the user.
03Surfaces
Every action is visible
Stream tool calls, memory reads, sub-agent output, artifacts, and gate decisions over SSE into the workspace or your own client.
On the wire
What the runtime actually streams.
Every turn surfaces as structured SSE events: lifecycle, sub-agent fan-outs, tool calls, memory reads, advisor gate verdicts. The web app reads this stream — same as your client would, same as the docs say.
See the event catalogHow it differs
Everything around the model call, already handled.
| Capability | Arbiter Cloud | Agent frameworks | Model APIs | DIY |
|---|---|---|---|---|
| Hosted API with tenant keys | Yes | deploy yourself | provider only | build it |
| Live stream of every agent step | Yes | varies | tokens only | build it |
| Advisor gates before replies ship | Yes | custom code | No | build it |
| Memory and artifacts across runs | Yes | bring storage | No | build it |
| Prepaid credits and hard usage stops | Yes | bring billing | provider billing | build it |
| Open runtime when you need it | Yes | mostly libraries | No | n/a |
Open API
Drive it from any stack.
Every workflow in the workspace is also a documented HTTP endpoint. Stream responses with SSE, manage agents and memory, execute tools, and route across providers — all behind one bearer-token API.
Or self-host the runtimePOST /v1/orchestrateSSE · OpenAPI 3.1
curl https://api.arbiter.run/v1/orchestrate \
-H "Authorization: Bearer $ARBITER_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"agent": "index",
"message": "Audit the auth flow for race conditions."
}'Get started
Build the agent team you wish you had.
Invite-only beta. Credit-based pricing — top up, run, stop when you want. No telemetry on your prompts, ever.