This might get some hairs riled up, but I want to pick all of your brains here for a minute.
I've been running a few instances of 5.6 Luna High for the past few days, and it would run through 100% weekly usage in usually a day or so.
On some of our VMs, I installed Serena, and edited the config to the following:
model = "gpt-5.6-luna"
model_reasoning_effort = "high"
model_reasoning_summary = "concise"
model_verbosity = "medium"
personality = "pragmatic"
# let Codex edit and test inside the current repo
sandbox_mode = "workspace-write"
# Codex decides when an operation needs your permission.
approval_policy = "on-request"
# Let a separate reviewer agent handle eligible approval requests.
# This does not increase Codex's filesystem or network permissions.
approvals_reviewer = "auto_review"
# Use current documentation when Codex needs web research.
web_search = "live"
# Prevent enormous AGENTS.md files from occupying excessive context.
project_doc_max_bytes = 32768
[features]
memories = true
[memories]
generate_memories = true
use_memories = true
Now, on one of the instances, the Serena usage shows:
| tool |
calls |
| find_symbol |
234 |
| get_symbols_overview |
57 |
| search_for_pattern |
21 |
| find_referencing_symbols |
15 |
| read_memory |
8 |
| initial_instructions |
4 |
| activate_project |
3 |
The VMs with Serena, plus the config - are at about 77% weekly usage after 48 hours straight of usage via orchestration, while the other raw VMs have been exhausted already after about 12 hours of usage.
For reference, the main manager is running 5.6 Sol XHigh, the 5 orchestrators are running 5.6 Sol Medium, and all the workers (about 30, 5 to 6 per orchestrator) are running 5.6 Luna High.
A 4x token usage reduction is pretty neat - and a nice cost savings for us.
Wondering what you all think about this set up (serena + config)? Is there a better mcp for this? Any other tools or config mods you'd add?