At some point you look at your cron list and realize you’ve been paying Claude Sonnet prices for tasks that don’t need Claude Sonnet.
That’s where I was on Friday night: 22 cron jobs running across my OpenClaw setup, a mix of models, some aliases that weren’t resolving, and a growing suspicion that I’d been sloppy about this for a while. Time to fix it properly.
—
## What Was Running
A quick inventory of what my automated jobs actually do:
– System healthchecks every few hours
– Security alert monitors (three separate jobs)
– Morning briefs and daily summaries
– Weekly business reviews
– Client update drafts
– Weekly training content generation
– Multilingual wellness messages to family group chats
– Revenue analysis and project tracking
– Regression testing
That’s 22 jobs. Some genuinely need a capable frontier model — you don’t want your security monitors running on a flaky local setup, and long-form writing tasks benefit from Sonnet-level output. But healthchecks? Project trackers? Things that mostly read files and return structured summaries? Those don’t need the expensive model.
The goal: move non-sensitive utility crons to local Devstral, keep security monitors on Claude Haiku (cheapest reliable cloud option), leave heavy writing jobs on Sonnet.
—
## Installing Devstral
“`bash
ollama pull devstral-small-2
“`
15GB download. Worth getting coffee.
Quick smoke test before touching any config:
“`bash
ollama run devstral-small-2 “Hello, what model are you?”
“`
Confirmed: Mistral AI identity, coherent response. Good start.
Register with OpenClaw:
“`bash
openclaw config set models.providers.ollama.apiKey “ollama-local”
openclaw config set agents.defaults.models.ollama/devstral-small-2.alias “devstral”
openclaw config set agents.defaults.heartbeat.model “ollama/devstral-small-2”
“`
**Critical: set reasoning to false for Devstral.**
“`bash
openclaw config set models.options.ollama/devstral-small-2.reasoning false
“`
Without this, OpenClaw sends the system prompt as a `”developer”` role message. Ollama ignores that role. Your agent runs without any of its instructions and you’ll spend an hour wondering why it’s behaving strangely.
Validate your config after every change:
“`bash
python3 -c “import json; json.load(open(‘openclaw.json’))”
“`
No output = clean. Error = fix before restarting.
—
## The Migration
Here’s a thing I learned: `openclaw cron set` doesn’t exist. The command you want is:
“`bash
openclaw cron edit –model
“`
I needed to edit 18 crons. You can do this as a batch — pull all your cron IDs, build a loop, run through them. Kept the three security monitor crons explicitly on `claude-haiku` rather than letting them drift. Security is not where you cut corners on model quality.
One cron threw an error during the migration: a one-shot reminder job with no `message` field. That’s a different payload type (`systemEvent` rather than `agentTurn`) — it doesn’t have a model field to set. Harmless, ignorable.
—
## The Final Stack
| Role | Model | Origin | API Cost |
|—|—|—|—|
| Main chat | Claude Sonnet | USA (Anthropic) | Per token |
| 18 background crons | Devstral Small 2 | France (Mistral) | Free (local) |
| Security monitors (3 crons) | Claude Haiku | USA (Anthropic) | ~$0.25/M input |
| Code tasks | Codex | USA (OpenAI) | Per token |
| Deep work / long-form | Claude Opus | USA (Anthropic) | Free (Max plan) |
—
## What to Watch After Deployment
**The first live local model run fires quickly.** If you’re running a healthcheck cron on a short interval, you’ll get a real test within minutes of deploying. Watch it.
**Monitor with:**
“`bash
openclaw logs –follow
“`
If you see `payload.model not allowed, falling back to agent defaults` — your alias isn’t resolving. Double-check the alias config and that Ollama is actually running.
**On the `qmd collection add skipped` warnings:** if you’ve set up QMD for memory, you’ll see these on restart. Normal. QMD is telling you the collections already exist and it’s skipping re-creation. Not an error.
**Tool call failures:** if tool calls are failing silently, verify you’re using Ollama’s native API endpoint, not the OpenAI-compatible `/v1` endpoint. They behave differently. The native API with `stream:false` is more reliable for agentic tool use.
—
## Cost Impact
18 crons running on cloud models, multiple times per day, with large system prompts — the costs compound fast. Moving them to local Devstral cuts that API spend to zero for those jobs. The electricity cost of running Devstral on an M4 Pro is rounding error.
The three security monitors staying on Claude Haiku aren’t free, but Haiku is the cheapest reliable Claude option. And “reliable” matters for security — you don’t want a flaky local model missing an alert because it hallucinated the output format.
The math is straightforward: use local models where reliability is acceptable and the task is routine. Use cloud models where reliability is non-negotiable or the task genuinely needs frontier-level capability.
—
## Lessons Learned
**Use the CLI, not the JSON editor.** I started by hand-editing `openclaw.json`. I ended the session having learned to use `openclaw config set` and `openclaw config unset` for everything. The CLI validates as it writes. JSON has no mercy for trailing commas.
**Know your Node versions.** If you’re running a LaunchAgent-based gateway, it may be using a different Node version than your interactive shell. Native bindings (SQLite, LanceDB, anything compiled) need to match the version that’s actually running the gateway — not the one you’re typing commands into.
**The dual-account setup creates friction.** If you’re running OpenClaw under a service account but installing tools under an admin account (for Homebrew, npm globals), plan for the permission boundaries. They will bite you if you don’t.
**Back up before every change.** `cp openclaw.json openclaw.json.bak` is three seconds. Config parse errors on restart are not.
**Friday nights are apparently when infrastructure gets rebuilt.** I’m not sure what that says about me.
—
*Hardware: Mac Mini M4 Pro, 24GB unified memory | OpenClaw v2026.3.13 | Node v25.6.1 (gateway) / v22.22.0 (shell) | Ollama at localhost:11434 | Devstral Small 2 (24B, ~15GB) | Bun 1.3.11*
I started writing down one thing at the end of every day — what I actually managed to do. Not a to-do list, not plans. Just one small win. It’s surprising how quickly it shifts your perspective.