🧭 fix: Migrate Anthropic Long Context

[danny-avila]

I migrated Anthropic long-context handling to the GA Sonnet 4.6 / Opus 4.6+ behavior and removed the retired 1M beta header path.

• Removed the retired context-1m-2025-08-07 header from direct Anthropic requests and Bedrock anthropic_beta request fields.
• Updated Claude context metadata so Sonnet 4 and Sonnet 4.5 resolve to 200K, while Sonnet 4.6 and Opus 4.6+ keep 1M.
• Removed Claude long-context premium pricing entries now that 1M context uses standard pricing.
• Pointed Vertex/default examples at claude-sonnet-4-6.
• Updated Anthropic, Bedrock, token, and transaction pricing tests for the new model behavior.

Change Type

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Testing

• Ran npm run build:data-provider && npm run build:data-schemas && npm run build:api
• Ran cd packages/data-provider && npx jest specs/bedrock.spec.ts --runInBand --coverage=false
• Ran cd packages/api && npx jest src/endpoints/anthropic/llm.spec.ts src/endpoints/openai/config.anthropic.spec.ts src/endpoints/bedrock/initialize.spec.ts src/agents/transactions.bulk-parity.spec.ts --runInBand --coverage=false
• Ran cd packages/data-schemas && npx jest src/methods/tx.spec.ts src/methods/spendTokens.spec.ts src/methods/transaction.spec.ts --runInBand --coverage=false
• Ran cd api && npx jest utils/tokens.spec.js --runInBand --coverage=false
• Ran git diff --check

Test Configuration:

• Node.js v20.19.5
• npm 10.8.2

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes

[Copilot]

Pull request overview

Migrates Anthropic long-context handling to GA behavior (Sonnet 4.6+/Opus 4.6+) by removing the retired context-1m-2025-08-07 beta header path, aligning context-window metadata, and simplifying pricing to standard rates for 1M-context Claude models.

Changes:

• Remove context-1m-2025-08-07 from direct Anthropic and Bedrock request wiring; keep only relevant remaining beta headers (e.g., output-128k-2025-02-19).
• Update Claude context-window metadata: Sonnet 4 / 4.5 → 200K; Sonnet 4.6 and Opus 4.6+ → 1M.
• Remove Claude “premium long context” pricing entries and update unit/integration tests + examples accordingly.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/data-schemas/src/methods/tx.ts	Adds Sonnet 4.5 standard pricing/cache rates; removes Claude premium long-context pricing entries.
packages/data-schemas/src/methods/tx.spec.ts	Updates premium pricing tests to use Gemini as the premium baseline; asserts Claude 1M GA models are standard-priced.
packages/data-schemas/src/methods/transaction.spec.ts	Updates premium-pricing integration tests to use gemini-3.1 and validates Claude 1M models are non-premium.
packages/data-schemas/src/methods/spendTokens.spec.ts	Updates spendTokens tests to remove Claude premium assertions and cover standard pricing above the former threshold.
packages/data-schemas/src/app/vertex.ts	Updates default Vertex Anthropic model example to claude-sonnet-4-6.
packages/data-provider/src/bedrock.ts	Refines supportsContext1m thresholding (Sonnet >=4.6); removes Bedrock injection of the retired context-1m beta header.
packages/data-provider/specs/bedrock.spec.ts	Updates Bedrock parsing tests to expect no context-1m beta header on Claude models.
packages/api/src/utils/tokens.ts	Adjusts Anthropic model context sizes (Sonnet 4 now 200K; adds Sonnet 4.5 at 200K).
packages/api/src/files/validation.ts	Updates documentation examples for Bedrock Claude 4+ model identifiers.
packages/api/src/endpoints/openai/config.anthropic.spec.ts	Removes expectation that Anthropic compatibility config sets the long-context beta header.
packages/api/src/endpoints/bedrock/initialize.spec.ts	Updates Bedrock initialization test expectations to drop the context-1m beta header.
packages/api/src/endpoints/anthropic/llm.spec.ts	Updates tests to assert promptCache works without setting long-context beta headers.
packages/api/src/endpoints/anthropic/helpers.ts	Removes the supportsContext1m header path for direct Anthropic requests.
packages/api/src/agents/transactions.bulk-parity.spec.ts	Updates premium-pricing parity tests to use gemini-3.1 instead of Claude.
librechat.example.yaml	Updates example configs to use claude-sonnet-4-6 and removes outdated model IDs.
api/utils/tokens.spec.js	Updates Claude token-limit tests for Sonnet 4.5 and for 4.6 > 4.5 context behavior.
.env.example	Updates example ANTHROPIC_MODELS list to remove claude-sonnet-4-20250514.

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[github-actions]

GitNexus: 🚀 deployed

The LibreChat-pr-12911 index is now live on the MCP server.
Deploy run

[danny-avila]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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