ByteDance Doubao Seed Evolving — continuously-updated Seed-series model. Latest improvements auto-deployed. Text only.
Doubao Seed Evolving is ByteDance's continuously updated Seed-family route for Coding and Agent workloads. TheRouter exposes it as bytedance/doubao-seed-evolving: a text-in/text-out OpenAI-compatible chat model with a 256,000-token catalog context window, 32,768-token maximum completion budget, streaming, tool calling, tool_choice, JSON response formatting, and stop sequences.
Use it when you want ByteDance's newest Seed improvements without pinning to a fixed snapshot such as Seed 2.1 Pro or Turbo. The tradeoff is operational: an evolving route can improve quickly, but it is also a moving target. Treat it as a production candidate only after workload-specific evals check code-edit correctness, tool-call arguments, latency, and regression stability on the exact prompts you route through TheRouter.
ByteDance / Volcano Ark operates doubao-seed-evolving as a continuously updated Seed-family text model. The local standard-models note records that the vendor publishes a 1024k context figure.
TheRouter exposes a text-only OpenAI-compatible chat route with the cataloged 256,000-token context window, 32,768-token max completion, and the parameters listed in standard-models.yaml. Treat TheRouter catalog values as the live contract unless account-level routing says otherwise.
| Type | Rate |
|---|---|
| Input | $0.9612 / 1M tokens |
| Output | $4.81 / 1M tokens |
| TheRouter model id | bytedance/doubao-seed-evolvingTheRouter model catalog ↗ | verified |
| Upstream model | doubao-seed-evolving via Volcano Engine Arkprovider-models/volcengine-ark.yaml ↗ | verified |
| Update model | Continuously updated Seed-series route; latest improvements auto-deployedstandard-models.yaml ↗ | verified |
| Context window | 256,000 tokens in TheRouter catalogstandard-models.yaml ↗ | verified |
| Vendor context note | The standard-models note says the vendor publishes 1024k while TheRouter stores 256000; route against the TheRouter catalog value unless your account contract says otherwisestandard-models.yaml ↗ | verified |
| Maximum completion | 32,768 tokensstandard-models.yaml ↗ | verified |
| Input / output modalities | Text in; text outstandard-models.yaml ↗ | verified |
| Supported OpenAI-style parameters | temperature, max_tokens, top_p, tools, tool_choice, response_format, stopstandard-models.yaml ↗ | verified |
| TheRouter price | $0.9612 / 1M input tokens; $4.806 / 1M output tokensTheRouter model catalog ↗ | verified |
| Route capabilities | streaming, tools, json_modeprovider-models/volcengine-ark.yaml ↗ | verified |
| Release / launch context | Introduced with the Doubao Seed 2.1 wave for Coding and Agent scenariosnews.qq.com ↗ | verified |
| License / weights | Proprietary API model; weights are not publishedstandard-models.yaml ↗ | verified |
| Training cutoff | Not publicly disclosed | unknown |
| Benchmark | Distribution | Score | Source |
|---|---|---|---|
Coding benchmarks Launch coverage positions the Evolving route for Coding scenarios, but the retrieved public sources do not publish a separate numeric benchmark table for this model id. | — | Not publicly disclosed | — |
Agent benchmarks Use vendor positioning as a routing hypothesis only; verify tool-call correctness and task completion on your own agent harness. | — | Not publicly disclosed | — |
TheRouter latency sample TheRouter has not published a TTFT / throughput table for this route. Measure latency and cost per successful task before promotion. | — | Not publicly disclosed | — |
Use the global api.therouter.ai endpoint shown below for new integrations; the legacy China accelerated endpoint is retired.
curl https://api.therouter.ai/v1/chat/completions -H "Content-Type: application/json" -H "Authorization: Bearer $THE_ROUTER_API_KEY" -d '{
"model": "bytedance/doubao-seed-evolving",
"messages": [
{"role": "user", "content": "Summarize the key points from this input."}
]
}'Drop the evolving route into an OpenAI-compatible chat client for long-context coding or agent prompts.
curl https://api.therouter.ai/v1/chat/completions \
-H "Authorization: Bearer $THEROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"bytedance/doubao-seed-evolving","messages":[{"role":"system","content":"You are a careful coding agent."},{"role":"user","content":"Review this migration plan and return JSON with risks and next steps."}],"response_format":{"type":"json_object"}}'Volcano Engine launch coverage describes Doubao Seed Evolving as the rapid-iteration route for Coding and Agent scenarios, shipped alongside the fixed Pro and Turbo Seed 2.1 models.
Yes. Use the standard OpenAI Chat Completions shape against https://api.therouter.ai/v1 and set model to bytedance/doubao-seed-evolving. The catalog lists temperature, max_tokens, top_p, tools, tool_choice, response_format, and stop.
Seed 2.1 Pro is a fixed flagship snapshot with text and image input. Seed Evolving is text-only on TheRouter and is positioned as a continuously updated route for coding and agent work. Choose Pro when image input or snapshot stability matters; test Evolving when you want faster access to new Seed behavior.
Only with eval coverage. An evolving model can improve without an integration change, but it can also shift behavior. Promote it when your automated tests cover tool-call arguments, JSON shape, latency, cost per accepted task, and regression examples.
| source | URL | retrieved | |
|---|---|---|---|
| TheRouter model id | TheRouter model catalog ↗ | 2026-08-03 | verified |
| Upstream model | provider-models/volcengine-ark.yaml ↗ | 2026-08-03 | verified |
| Update model | standard-models.yaml ↗ | 2026-08-03 | verified |
| Context window | standard-models.yaml ↗ | 2026-08-03 | verified |
| Vendor context note | standard-models.yaml ↗ | 2026-08-03 | verified |
| Maximum completion | standard-models.yaml ↗ | 2026-08-03 | verified |
| Input / output modalities | standard-models.yaml ↗ | 2026-08-03 | verified |
| Supported OpenAI-style parameters | standard-models.yaml ↗ | 2026-08-03 | verified |
| TheRouter price | TheRouter model catalog ↗ | 2026-08-03 | verified |
| Route capabilities | provider-models/volcengine-ark.yaml ↗ | 2026-08-03 | verified |
| Release / launch context | news.qq.com ↗ | 2026-08-03 | verified |
| License / weights | standard-models.yaml ↗ | 2026-08-03 | verified |
| Training cutoff | — | — | unknown |
| Coding benchmarks | news.qq.com ↗ | 2026-08-03 | unknown |
| Agent benchmarks | news.qq.com ↗ | 2026-08-03 | unknown |
| TheRouter latency sample | TheRouter model catalog ↗ | 2026-08-03 | unknown |
| ByteDance introduces Doubao Seed Evolving with the Seed 2.1 wave | news.qq.com ↗ | 2026-08-03 | verified |
| Is Doubao Seed Evolving OpenAI-compatible on TheRouter? | standard-models.yaml ↗ | 2026-08-03 | to verify |
| How is Evolving different from Doubao Seed 2.1 Pro? | news.qq.com ↗ | 2026-08-03 | to verify |
| Should I use an evolving model in production? | standard-models.yaml ↗ | 2026-08-03 | to verify |