feat: add Volcengine Coding Plan provider

providers/volcengine-coding-plan/models/ark-code-latest.toml

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+# Default Coding Plan alias that routes to the plan's latest coding model.
+# Sources (accessed 2026-08-03):
+# https://www.volcengine.com/docs/82379/1925114
+# https://www.volcengine.com/docs/82379/2556056
+name = "Ark Code Latest"
+description = "Auto-routing alias for the latest coding model included in the Volcengine Ark Coding Plan"
+family = "auto"
+release_date = "2025-11"
+last_updated = "2025-11"
+attachment = false
+reasoning = false
+temperature = true
+tool_call = true
+open_weights = false
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0
+
+[limit]
+context = 256_000
+output = 16_384
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/volcengine-coding-plan/models/deepseek-v4-flash.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "deepseek/deepseek-v4-flash"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/deepseek-v4-pro.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "deepseek/deepseek-v4-pro"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/doubao-seed-2.0-lite.toml

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+# ByteDance first-party coding model on its own Ark platform. Deep thinking is
+# toggled with top-level `thinking.type` = enabled|disabled and returned as
+# `reasoning_content`. Lite tier of the Doubao Seed 2.0 coding family.
+# Sources (accessed 2026-08-03):
+# https://www.volcengine.com/docs/82379/1925114
+# https://www.volcengine.com/docs/82379/1449737
+name = "Doubao Seed 2.0 Lite"
+description = "ByteDance Doubao Seed 2.0 lite coding model for cost-efficient agentic software engineering"
+family = "seed"
+release_date = "2026-02"
+last_updated = "2026-02"
+attachment = false
+reasoning = true
+reasoning_options = [{ type = "toggle" }]
+temperature = true
+tool_call = true
+open_weights = false
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0
+
+[limit]
+context = 256_000
+output = 32_768
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/volcengine-coding-plan/models/doubao-seed-2.1-turbo.toml

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+# ByteDance first-party coding model on its own Ark platform. Deep thinking is
+# toggled with top-level `thinking.type` = enabled|disabled and returned as
+# `reasoning_content`. Turbo tier of the Doubao Seed 2.1 coding family.
+# Sources (accessed 2026-08-03):
+# https://www.volcengine.com/docs/82379/1925114
+# https://www.volcengine.com/docs/82379/1449737
+name = "Doubao Seed 2.1 Turbo"
+description = "ByteDance Doubao Seed 2.1 turbo coding model for low-latency agentic software engineering"
+family = "seed"
+release_date = "2026-05"
+last_updated = "2026-05"
+attachment = false
+reasoning = true
+reasoning_options = [{ type = "toggle" }]
+temperature = true
+tool_call = true
+open_weights = false
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0
+
+[limit]
+context = 256_000
+output = 32_768
+
+[modalities]
+input = ["text"]
+output = ["text"]

providers/volcengine-coding-plan/models/glm-5.2.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "zhipuai/glm-5.2"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/kimi-k2.6.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "moonshotai/kimi-k2.6"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/kimi-k2.7-code.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "moonshotai/kimi-k2.7-code"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/minimax-m2.7.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "minimax/MiniMax-M2.7"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/models/minimax-m3.toml

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+# Toggle: thinking.type = enabled|disabled
+# Coding Plan deep thinking is toggled with top-level `thinking.type` and
+# returned as `reasoning_content`.
+# https://www.volcengine.com/docs/82379/1925114 (accessed 2026-08-03)
+base_model = "minimax/MiniMax-M3"
+reasoning_options = [{ type = "toggle" }]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0
+cache_write = 0

providers/volcengine-coding-plan/provider.toml

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+# OpenAI-compatible coding plan endpoint: POST
+# https://ark.cn-beijing.volces.com/api/coding/v3/chat/completions (a Responses
+# surface is also served). Deep thinking is toggled with top-level
+# `thinking.type` = enabled|disabled and is returned as `reasoning_content` on
+# the message or streamed delta. An Anthropic-compatible surface for
+# Claude-style clients lives at /api/coding. Subscription usage must go through
+# /api/coding/*; the pay-as-you-go /api/v3 endpoint bills separately. The plan
+# bundles ByteDance Doubao Seed models plus DeepSeek, GLM, Kimi, and MiniMax.
+# Sources:
+# https://www.volcengine.com/docs/82379/1925114
+# https://www.volcengine.com/docs/82379/2556056
+# https://www.volcengine.com/activity/codingplan
+name = "Volcengine Coding Plan (China)"
+env = ["ARK_API_KEY"]
+npm = "@ai-sdk/openai-compatible"
+doc = "https://www.volcengine.com/docs/82379/1925114"
+api = "https://ark.cn-beijing.volces.com/api/coding/v3"