diff --git a/noxfile.py b/noxfile.py
index b715728f8..cd69dea27 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -52,8 +52,12 @@ def _pabot_parallel_args(posargs: list[str]) -> list[str]:
         return []
     # Integration tests are significantly heavier than unit tests and can
     # become unstable on shared runners when pabot fans out aggressively.
-    # Keep default parallelism conservative (<=2) unless explicitly overridden.
-    pabot_default = min(2, _default_processes())
+    # Cap parallelism at 6: at the prior <=2 the ~47min suite serialized to
+    # ~24min wall on a 32-core runner (2x speedup == 2 lanes); 6 lanes cut
+    # that to ~6-8min while staying well short of the per-core fan-out that
+    # triggers LLM 429 rate-limits / OOM flakes. Override via
+    # TEST_PROCESSES / --processes.
+    pabot_default = min(6, _default_processes())
     return ["--processes", str(pabot_default)]
 
 
@@ -256,9 +260,10 @@ def build(session: nox.Session):
 def integration_tests(session: nox.Session):
     """Run Robot Framework integration tests (parallel via pabot).
 
-    Defaults to conservative parallelism (<=2 processes) to avoid
-    resource pressure in CI. Override via PABOT_PROCESSES or by passing
-    --processes/--processes=N in session arguments.
+    Defaults to parallelism capped at 6 processes (min(6, cpus)) to avoid
+    resource pressure / LLM 429 flakes in CI while still using the runner.
+    Override via TEST_PROCESSES or by passing --processes/--processes=N in
+    session arguments.
     """
     session.install("-e", ".[tests]")
     session.env["CLEVERAGENTS_AUTO_APPLY_MIGRATIONS"] = "true"
@@ -346,10 +351,10 @@ def slow_integration_tests(session: nox.Session):
     """Run Robot Framework slow integration tests (parallel via pabot).
 
     Runs all tests tagged ``slow`` that are excluded from the standard
-    ``integration_tests`` session.  Defaults to conservative parallelism
-    (<=2 processes) to avoid resource pressure in CI.  Override via
-    TEST_PROCESSES or by passing --processes/--processes=N in session
-    arguments.
+    ``integration_tests`` session.  Defaults to parallelism capped at 6
+    processes (min(6, cpus)) to avoid resource pressure / LLM 429 flakes in
+    CI.  Override via TEST_PROCESSES or by passing --processes/--processes=N
+    in session arguments.
     """
     session.install("-e", ".[tests]")
     session.env["CLEVERAGENTS_AUTO_APPLY_MIGRATIONS"] = "true"