diff --git a/providers/opencode-go/models/mimo-v2.6-flash.toml b/providers/opencode-go/models/mimo-v2.6-flash.toml
index 06b0dcf1faa..7000af41713 100644
--- a/providers/opencode-go/models/mimo-v2.6-flash.toml
+++ b/providers/opencode-go/models/mimo-v2.6-flash.toml
@@ -1,5 +1,9 @@
+# Effort: reasoning_effort = none|low|medium|high (live probe 2026-09-22: these four pass;
+# xhigh|max|minimal|adaptive|default → 400; none → 0 reasoning tokens; thinking.type also
+# honored, but none ∈ effort so no separate toggle)
+# https://mimo.mi.com/docs/api/chat/openai-api (accessed 2026-09-22)
 base_model = "xiaomi/mimo-v2.6-flash"
-reasoning_options = []
+reasoning_options = [{ type = "effort", values = ["none", "low", "medium", "high"] }]
 
 [interleaved]
 field = "reasoning_content"
diff --git a/providers/opencode-go/models/mimo-v2.6-pro.toml b/providers/opencode-go/models/mimo-v2.6-pro.toml
index 7513e538ec8..a4768bd3cec 100644
--- a/providers/opencode-go/models/mimo-v2.6-pro.toml
+++ b/providers/opencode-go/models/mimo-v2.6-pro.toml
@@ -1,5 +1,9 @@
+# Effort: reasoning_effort = none|low|medium|high (live probe 2026-09-22: these four pass;
+# xhigh|max|minimal|adaptive|default → 400; none → 0 reasoning tokens; thinking.type also
+# honored, but none ∈ effort so no separate toggle)
+# https://mimo.mi.com/docs/api/chat/openai-api (accessed 2026-09-22)
 base_model = "xiaomi/mimo-v2.6-pro"
-reasoning_options = []
+reasoning_options = [{ type = "effort", values = ["none", "low", "medium", "high"] }]
 
 [interleaved]
 field = "reasoning_content"
diff --git a/providers/opencode/models/mimo-v2.6-flash-free.toml b/providers/opencode/models/mimo-v2.6-flash-free.toml
index 753e0075aa2..ecdab2cb6d3 100644
--- a/providers/opencode/models/mimo-v2.6-flash-free.toml
+++ b/providers/opencode/models/mimo-v2.6-flash-free.toml
@@ -1,6 +1,11 @@
+# Effort: reasoning_effort = none|low|medium|high (Zen free tier rejects probes outside
+# OpenCode — 403 FreeTierError — so values come from the live zen/go probe on the same
+# base_model 2026-09-22 plus kilo's effort entry for xiaomi/mimo-v2.6-*; none ∈ effort so
+# no separate toggle)
+# https://mimo.mi.com/docs/api/chat/openai-api (accessed 2026-09-22)
 base_model = "xiaomi/mimo-v2.6-flash"
 name = "MiMo-V2.6-Flash Free"
-reasoning_options = []
+reasoning_options = [{ type = "effort", values = ["none", "low", "medium", "high"] }]
 
 [interleaved]
 field = "reasoning_content"