diff --git a/providers/stepfun-step-plan/models/step-3.5-flash-2603.toml b/providers/stepfun-step-plan/models/step-3.5-flash-2603.toml
new file mode 100644
index 000000000..e7dd1bbd0
--- /dev/null
+++ b/providers/stepfun-step-plan/models/step-3.5-flash-2603.toml
@@ -0,0 +1,22 @@
+name = "Step 3.5 Flash 2603"
+release_date = "2026-04-02"
+last_updated = "2026-04-02"
+attachment = false
+reasoning = true
+temperature = true
+tool_call = true
+knowledge = "2025-01"
+open_weights = true
+
+[cost]
+input = 0
+output = 0
+
+[limit]
+context = 256_000
+input = 256_000
+output = 256_000
+
+[modalities]
+input = ["text"]
+output = ["text"]
diff --git a/providers/stepfun-step-plan/models/step-3.5-flash.toml b/providers/stepfun-step-plan/models/step-3.5-flash.toml
new file mode 100644
index 000000000..d4bb7497d
--- /dev/null
+++ b/providers/stepfun-step-plan/models/step-3.5-flash.toml
@@ -0,0 +1,22 @@
+name = "Step 3.5 Flash"
+release_date = "2026-01-29"
+last_updated = "2026-02-13"
+attachment = false
+reasoning = true
+temperature = true
+tool_call = true
+knowledge = "2025-01"
+open_weights = true
+
+[cost]
+input = 0
+output = 0
+
+[limit]
+context = 256_000
+input = 256_000
+output = 256_000
+
+[modalities]
+input = ["text"]
+output = ["text"]
diff --git a/providers/stepfun-step-plan/provider.toml b/providers/stepfun-step-plan/provider.toml
new file mode 100644
index 000000000..4a855fc9b
--- /dev/null
+++ b/providers/stepfun-step-plan/provider.toml
@@ -0,0 +1,5 @@
+name = "StepFun Step Plan"
+env = ["STEPFUN_API_KEY"]
+npm = "@ai-sdk/openai-compatible"
+doc = "https://platform.stepfun.ai/docs/en/step-plan/overview"
+api = "https://api.stepfun.ai/step_plan/v1"