Do this first
Fast checklist
- 01
Look for the multiplayer marker on the activity you want to run.
- 02
Check the live lobby's player-slot count before inviting everyone.
- 03
Do not assume the whole story or open world is playable together.
- 04
Re-check current patch notes after a major game update.
Confirmed by official sources
- The Steam release lists Online Co-op.
- Official patch notes refer to Quick Entry, multiplayer lobbies, and lobby search range settings.
- Official 1.0.10 notes describe multiplayer party behaviour when the leader is unresponsive for a long time.
Not confirmed in the sources we checked
The Steam store page does not publish a single maximum co-op size for every activity. It also does not describe a fully shared campaign or open-world mode. Different activities may present different capacities, so publishing one number without naming the activity would be misleading.
The useful answer when a friend asks
Tell them that Online Co-op is confirmed, then open the specific activity and read its live lobby. That gives a faster, more current answer than repeating a number from an older video. This page will change only when an official source documents more exact mode-by-mode limits.
Proof, not vibes
Sources
LevelLime is an independent guide. It is not affiliated with Hound13 Inc., Valve, or Steam. Community posts can inspire questions, but the factual claims above are checked against the linked official sources.