[ulemons]

Summary

Step 2 of #820, after #4996 proved Claude Sonnet 5.5 in production on the project evaluation. Bedrock retired Claude Sonnet 4 on 2026-10-16; this moves every remaining use of it, as asked by the CDP team.

• Seven LLM_SETTINGS query types → Claude Sonnet 5.5 (us.anthropic.claude-sonnet-5-5): member enrichment, squash of multi-value attributes, squash of work experiences, repo categories, repo collections, select most relevant domain, fake organization analysis. As in fix: move project evaluation to claude sonnet 5.5 after bedrock retired sonnet 4 (lfx-cdp-insights-ops#820) #4996: temperature removed (Claude 5 models return 400 on non-default sampling parameters) and thinking: { type: 'between_tools' } (the lowest thinking setting on Sonnet 5.5; no tools, so the response is text only). LlmService already reads the first text block.
• Merge-suggestion workflows (members and organizations) → Claude Sonnet 5 (us.anthropic.claude-sonnet-5), not 5.5: they force the decision tool with tool_choice: { type: 'tool' }, which Sonnet 5.5 rejects with a 400 (tool_choice: type "tool" and "any" are not supported for this model). The documented replacement is tool_choice: auto plus strict: true, but on Amazon Bedrock only auto is available, and with auto the model may answer in text and send the decision into retries. Sonnet 5 still accepts forced tool use and thinking: { type: 'disabled' }, costs the same as 5.5 ($2 / $10 per MTok), and is active with EOL no sooner than 2027-06-30. temperature removed for the same reason as above.
• No Sonnet 4 reference is left in the code; the enum value stays for prompt history. Haiku 4.5 is untouched.

Behaviour note: without temperature: 0, answers are no longer fully deterministic across repeated calls. This is unavoidable on the Claude 5 family.

Changes

• enums/llm.ts: CLAUDE_SONNET_5.
• llm.ts: region and pricing for Sonnet 5; the seven settings above.
• mergeMembersWithLLM.ts, mergeOrganizationsWithLLM.ts: model id and arguments.

Before deploying

Confirm the AWS account has Sonnet 5.5 and Sonnet 5 enabled in Bedrock model access (5.5 is already used by #4996; Sonnet 5 is listed as open access).

Test plan

• vitest types and merge_suggestions_worker, pnpm lint --deny-warnings, pnpm tsc-check
• Deploy: backend, members-enrichment worker, profiles worker (fake organization analysis), merge-suggestions worker, projects-evaluation worker
• processMemberSources runs without the "Activity Retry Limit Reached" alert
• llmPromptHistory shows the new model ids for the moved types; merge decisions keep producing tool_use results

Closes linuxfoundation/lfx-cdp-insights-ops#820

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Touches core enrichment and merge-decision LLM paths; model and sampling changes can alter merge outcomes and enrichment quality until validated in production.

Overview
Migrates off retired Claude Sonnet 4 on Bedrock before EOL: seven shared LLM_SETTINGS query types (member enrichment, attribute/work-experience squash, repo categories/collections, domain selection, fake-org analysis) now use Claude Sonnet 5.5 with thinking: { type: 'between_tools' } instead of temperature: 0.

Member and organization merge-suggestion workflows switch to Claude Sonnet 5 with thinking: { type: 'disabled' } so forced tool_choice for merge decisions keeps working (5.5 rejects that pattern on Bedrock). Types add CLAUDE_SONNET_5 with us-east-1 region and pricing aligned to Sonnet 5.5.

Responses may be slightly less deterministic without temperature: 0, which is required on the Claude 5 family.

^{Reviewed by Cursor Bugbot for commit 9e4be7d. Bugbot is set up for automated code reviews on this repo. Configure here.}

[Copilot]

🔵 Needs a closer look

Live Bedrock validation remains pending for Sonnet 5 workflows that automatically merge profiles.

0 open findings

What changed in this PR

Completes the model migration started in #4996, moving remaining active Sonnet 4 calls to newer models.

Changes:

• Moves seven shared query types to Sonnet 5.5 with updated thinking settings.
• Moves member and organization merge decisions to Sonnet 5, preserving forced tool use.
• Adds Sonnet 5 model, region, and pricing definitions.

File	Description
services/​libs/​types/​src/​llm.ts	Updates shared model settings and adds Sonnet 5 region and pricing.
services/​libs/​types/​src/​enums/​llm.ts	Adds the Sonnet 5 model identifier.
services/​apps/​merge_suggestions_worker/​src/​workflows/​mergeOrganizationsWithLLM.ts	Migrates organization merge decisions to Sonnet 5.
services/​apps/​merge_suggestions_worker/​src/​workflows/​mergeMembersWithLLM.ts	Migrates member merge decisions to Sonnet 5.

🧠 Review effort: Balanced

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.