feat: Add StepFun provider support

providers/stepfun/models/step-1-32k.toml

@@ -0,0 +1,23 @@
+name = "Step 1 (32K)"
+release_date = "2025-01-01"
+last_updated = "2026-02-13"
+attachment = false
+reasoning = true
+temperature = true
+tool_call = true
+knowledge = "2024-06"
+open_weights = false
+
+[cost]
+input = 2.05
+output = 9.59
+cache_read = 0.41
+
+[limit]
+context = 32_768
+input = 32_768
+output = 32_768
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/stepfun/models/step-2-16k.toml

@@ -0,0 +1,23 @@
+name = "Step 2 (16K)"
+release_date = "2025-01-01"
+last_updated = "2026-02-13"
+attachment = false
+reasoning = true
+temperature = true
+tool_call = true
+knowledge = "2024-06"
+open_weights = false
+
+[cost]
+input = 5.21
+output = 16.44
+cache_read = 1.04
+
+[limit]
+context = 16_384
+input = 16_384
+output = 8_192
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/stepfun/models/step-3.5-flash.toml

@@ -0,0 +1,23 @@
+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 = 0.096
+output = 0.288
+cache_read = 0.019
+
+[limit]
+context = 256_000
+input = 256_000
+output = 256_000
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/stepfun/provider.toml

@@ -0,0 +1,5 @@
+name = "StepFun"
+env = ["STEPFUN_API_KEY"]
+npm = "@ai-sdk/openai-compatible"
+doc = "https://platform.stepfun.com/docs/zh/overview/concept"
+api = "https://api.stepfun.com/v1"