
omni-combos-routing
Create and manage routing combos with 19 strategies (priority, weighted, round-robin, Auto-combo, and more). Configure fallback chains, test routing outcomes, and retrieve combo metrics.
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- #5350
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/cheaper-inference/omniroute --skill omni-combos-routing- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads omni-combos-routing automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Overview
Create and manage routing combos with 19 strategies (priority, weighted, round-robin, Auto-combo, and more). Configure fallback chains, test routing outcomes, and retrieve combo metrics.
Authentication
All requests require a valid Bearer token or session cookie. Obtain a token via POST /api/auth/login or configure REQUIRE_API_KEY=false for local development.
Endpoints
GET /api/combos
List routing combos
curl http://localhost:20128/api/combos \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
POST /api/combos
Create routing combo
curl -X POST http://localhost:20128/api/combos \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
GET /api/combos/{id}
Get combo by ID
curl http://localhost:20128/api/combos/{id} \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
PUT /api/combos/{id}
Update combo
Partial update: the body is merged onto the stored combo, so a field left out keeps its current value. An array that IS sent replaces the stored one outright.
curl -X PUT http://localhost:20128/api/combos/{id} \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
PATCH /api/combos/{id}
Update combo
Partial update: the body is merged onto the stored combo, so a field left out keeps its current value. An array that IS sent replaces the stored one outright.
curl -X PATCH http://localhost:20128/api/combos/{id} \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
DELETE /api/combos/{id}
Delete combo
curl -X DELETE http://localhost:20128/api/combos/{id} \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
GET /api/combos/metrics
Get combo metrics
curl http://localhost:20128/api/combos/metrics \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
POST /api/combos/test
Test a combo configuration
curl -X POST http://localhost:20128/api/combos/test \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
GET /api/fallback/chains
List fallback chains
Returns all registered fallback chains for model routing.
curl http://localhost:20128/api/fallback/chains \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
POST /api/fallback/chains
Create fallback chain
Registers a fallback routing chain for a model.
curl -X POST http://localhost:20128/api/fallback/chains \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
DELETE /api/fallback/chains
Delete fallback chain
curl -X DELETE http://localhost:20128/api/fallback/chains \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
GET /api/combos/auto
GET combos › auto
curl http://localhost:20128/api/combos/auto \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
GET /api/combos/builder/options
GET combos › builder › options
curl http://localhost:20128/api/combos/builder/options \
-H "Authorization: Bearer $OMNIROUTE_TOKEN"
POST /api/combos/duplicate
POST combos › duplicate
curl -X POST http://localhost:20128/api/combos/duplicate \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
POST /api/combos/reorder
POST combos › reorder
curl -X POST http://localhost:20128/api/combos/reorder \
-H "Authorization: Bearer $OMNIROUTE_TOKEN" \
-H "Content-Type: application/json" \
-d '{}'
Payloads
See the full OpenAPI specification at GET /api/openapi/spec or docs/openapi.yaml for detailed request/response schemas.
OmniRoute — Routing & Combos
Requires OMNIROUTE_URL and OMNIROUTE_KEY. See entry-point SKILL for setup.
What is a combo?
A combo is a named group of providers/models with a routing strategy. All requests through a combo are automatically distributed, failed-over, and load-balanced — the caller uses a single model ID like my-combo.
List existing combos
curl $OMNIROUTE_URL/api/combos \
-H "Authorization: Bearer $OMNIROUTE_KEY"
Response includes id, name, strategy, enabled, and per-target stats.
Create a combo
curl -X POST $OMNIROUTE_URL/api/combos \
-H "Authorization: Bearer $OMNIROUTE_KEY" \
-H "Content-Type: application/json" \
-d '{
"name": "my-combo",
"strategy": "priority",
"targets": [
{ "provider": "anthropic", "model": "claude-opus-4-7", "weight": 1 },
{ "provider": "openai", "model": "gpt-4o", "weight": 1 }
]
}'
19 public routing strategies
| Strategy | Description |
|---|---|
priority | Always use target[0]; fall back on error |
weighted | Distribute by weight percentage |
round-robin | Rotate targets in order |
context-relay | Chain models for very long contexts |
fill-first | Fill quota of target[0] before spilling |
p2c | Power-of-two choices: sample two targets, pick the better candidate |
random | Uniform random selection |
least-used | Route to the target with the lowest observed usage |
cost-optimized | Pick the cheapest eligible target for the token estimate |
reset-aware | Prefer targets based on quota-reset state |
reset-window | Order targets by their configured reset window |
headroom | Prefer targets with more remaining quota headroom |
strict-random | Random without repeating until all targets have been used |
auto | Auto-Combo scoring across 16 factors |
lkgp | Last-known-good-provider sticky routing |
context-optimized | Pick the best model for the request's context size |
cache-optimized | Prefer targets with stronger cache affinity |
fusion | Run a panel in parallel and synthesize one judged response |
pipeline | Run a configured sequence of targets as a pipeline |
Auto-combo (recommended for production)
Auto-combo scores each candidate on 16 factors every request:
curl -X POST $OMNIROUTE_URL/api/combos \
-H "Authorization: Bearer $OMNIROUTE_KEY" \
-H "Content-Type: application/json" \
-d '{
"name": "prod-auto",
"strategy": "auto",
"targets": [
{ "provider": "anthropic", "model": "claude-sonnet-4-6" },
{ "provider": "openai", "model": "gpt-4o-mini" },
{ "provider": "google", "model": "gemini-2.0-flash" }
]
}'
Then call it with:
curl -X POST $OMNIROUTE_URL/v1/chat/completions \
-H "Authorization: Bearer $OMNIROUTE_KEY" \
-H "Content-Type: application/json" \
-d '{ "model": "prod-auto", "messages": [{ "role": "user", "content": "Hello" }] }'
Activate / deactivate a combo
# Activate
curl -X PUT $OMNIROUTE_URL/api/combos/{id}/toggle \
-H "Authorization: Bearer $OMNIROUTE_KEY" \
-d '{ "enabled": true }'
Get combo metrics
curl $OMNIROUTE_URL/api/combos/{id}/metrics \
-H "Authorization: Bearer $OMNIROUTE_KEY"
Returns p50/p95/p99 latency, success rate, cost, and per-target breakdown.
Simulate routing (dry run)
curl -X POST $OMNIROUTE_URL/api/routing/simulate \
-H "Authorization: Bearer $OMNIROUTE_KEY" \
-H "Content-Type: application/json" \
-d '{ "comboId": "{id}", "messages": [{ "role": "user", "content": "test" }] }'
Returns which provider would be selected and why — no actual API call is made.
Via MCP (if OmniRoute is your MCP server)
omniroute_list_combos → list all combos
omniroute_switch_combo → enable/disable a combo
omniroute_set_routing_strategy → change strategy at runtime
omniroute_simulate_route → dry-run routing decision
omniroute_best_combo_for_task → get recommendation by task type
Errors
404 combo not found→ checkidfrom/api/combos400 invalid strategy→ use one of the 19 strategies above409 name conflict→ combo name already exists
FAQ
What does the omni-combos-routing skill do?
Create and manage routing combos with 19 strategies (priority, weighted, round-robin, Auto-combo, and more). Configure fallback chains, test routing outcomes, and retrieve combo metrics.
How do I install omni-combos-routing?
Run npx skills add https://github.com/cheaper-inference/omniroute --skill omni-combos-routing in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/omni-combos-routing/ (personal) or .claude/skills/omni-combos-routing/ (project).
Which AI agents can use omni-combos-routing?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is omni-combos-routing safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains omni-combos-routing?
It is published by cheaper-inference in cheaper-inference/omniroute. It has 1,251 recorded installs.
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