chore: remove feature flagged ai sdk usage

[uinstinct]

Description

AI SDK usage could be triggered with the usage of USE_VERCEL_AI_SDK_ANTHROPIC and USE_VERCEL_AI_SDK_OPENAI

Since now we have the AiSdk LLM api, these can be removed.

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Removed the Vercel AI SDK feature-flag paths from OpenAI and Anthropic adapters. These adapters now always use their native clients; AI SDK usage is via the dedicated ai-sdk provider.

• Refactors

  • Removed USE_VERCEL_AI_SDK_OPENAI and USE_VERCEL_AI_SDK_ANTHROPIC code paths from OpenAI.ts and Anthropic.ts.
  • Deleted VERCEL_AI_SDK.md and the Anthropic multi-turn tools test.
  • Updated tests to use provider: "ai-sdk" with fully qualified models (e.g., openai/gpt-4o-mini, anthropic/claude-*); disabled streaming usage assertions in vercel-sdk tests.

• Migration

  • The USE_VERCEL_AI_SDK_* env flags are no longer supported.
  • To use the AI SDK, configure provider: "ai-sdk" and model: "/" (e.g., openai/gpt-4o-mini or anthropic/claude-haiku-4-5).

^{Written for commit 85f2140. Summary will update on new commits.}

[continue-staging]

Docs Review

No documentation updates needed for this PR.

Reason: This change removes internal feature flags (USE_VERCEL_AI_SDK_OPENAI and USE_VERCEL_AI_SDK_ANTHROPIC) that were used for gradual rollout testing. These environment variables were never documented as public configuration options—they were internal implementation details. The deleted VERCEL_AI_SDK.md file was developer-facing documentation within the packages/openai-adapters directory, not part of the public Continue docs.

Users configuring AI providers continue to use the same documented approaches, with no changes to their workflow or configuration.

[continue-staging]

Documentation Review

No documentation updates are required for this PR.

Reason: This PR removes internal feature-flagged Vercel AI SDK code from the openai-adapters package. The deleted VERCEL_AI_SDK.md file and the USE_VERCEL_AI_SDK_* environment variables were internal implementation details that were never exposed in the public Continue documentation. Users did not interact with these feature flags, so there's nothing to update or remove from the docs.

[cubic-dev-ai]

1 issue found across 6 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="packages/openai-adapters/src/test/vercel-sdk.test.ts">

<violation number="1" location="packages/openai-adapters/src/test/vercel-sdk.test.ts:47">
P2: testAiSdkProvider ignores expectUsage from the config and always disables usage assertions, so callers that set expectUsage: true never get coverage.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}