feat: add DeepSeek as a supported model provider#3361
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Add deepseek as a built-in OpenAI-compatible alias provider, following the groq/baseten pattern. Registers the alias (base URL https://api.deepseek.com/v1, token DEEPSEEK_API_KEY), auto-detection in cloudProviders, default model deepseek-chat, schema and docs updates, an example config, and unit tests. DeepSeek is present in models.dev, so it is a first-class catalog provider and is intentionally not added to modelsDevAbsentProviders. Its first-party API has a fixed model lineup (deepseek-chat, deepseek-reasoner), so it is left out of shouldMergeConsecutiveMessages like the other first-party APIs (mistral, xai). Also adds an end-to-end test that drives a real HTTP request through the full stack against a local OpenAI-compatible server, plus a DEEPSEEK_API_KEY-gated live API test. Closes #3347
dgageot
approved these changes
Jul 1, 2026
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Summary
Adds DeepSeek as a built-in OpenAI-compatible alias provider, following the existing Groq/Baseten pattern. Closes #3347.
Definition of Done
deepseek(openai,https://api.deepseek.com/v1,DEEPSEEK_API_KEY)IsCatalogProvider("deepseek")is trueCatalogProviders()task testandtask lintpassexamples/deepseek.yaml)Changes
pkg/model/provider/aliases.godeepseekalias entrypkg/config/auto.gocloudProvidersandDefaultModels["deepseek"] = "deepseek-chat"agent-schema.json,docs/**,examples/README.mddocs/providers/deepseek/index.md,examples/deepseek.yamlTests
TestDeepSeekAliasIsKnownProvider/IsCatalogProvidertrueauto_test.gocasesTestShouldMergeConsecutiveMessages_Gating(deepseek case)TestDeepSeekProvider_EndToEndRequestBearer DEEPSEEK_API_KEY,/chat/completionsrouting, verbatim model, serialized user message, stream reassemblyTestDeepSeekLiveAPIapi.deepseek.com, gated onDEEPSEEK_API_KEY(skipped otherwise)Design notes
deepseek-chatis the default because it exists in the bundled models.dev snapshot, so the example passes the catalog lookup anddeepseekis not added tomodelsDevAbsentProviders.deepseek-chat,deepseek-reasoner), so it is deliberately left out ofopenModelHostProviders/shouldMergeConsecutiveMessages, consistent withmistralandxai. This decision was not verified against the live API; if DeepSeek's API turns out to reject multiple system messages, adding it toopenModelHostProvidersis a one-line follow-up.TestDeepSeekLiveAPI) was not exercised in CI (no key available); all other coverage runs hermetically.