Cause (Maintainer-confirmed cause): Encrypted reasoning items are bound to the creating organization; router affinity options (deployment_affinity, session_affinity) were too broad or needed session ids.
Fix status: released_fix (fixed in unknown (Feb 2026; opt-in pre-call check))
Workaround (not a fix): Use a single org/API key per model group, or deployment_affinity (reduces effective quota).
Misleading approaches:
- deployment_affinity/session_affinity: work but cut effective quota to 1/N
Limitations:
- Complements Atlas signature for the raw OpenAI error; this record is the LiteLLM routing cause
Unknowns:
- Exact version introducing encrypted_content_affinity
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/BerriAI/litellm-docs/main/blog/responses_api_encrypted_content_incident/index.md (official_docs, 2026-02-24, maintainer_confirmed_cause): Incident: load balancing Responses API across different API keys broke follow-ups with invalid_encrypted_content (organization_id mismatch); fix adds encrypted_content_affinity pre-call check configured via router_settings optional_pre_call_checks, embedding model_id so routing works even when clients (e.g. Codex) omit item ids.
Search phrasings: litellm responses api load balancing encrypted content error; litellm codex multiple azure regions invalid_encrypted_content; encrypted_content_affinity litellm
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- First request succeeds; follow-ups containing rs_ reasoning items fail with invalid_encrypted_content when routed to another deployment.
- Context
- Product: LiteLLM Router/Proxy Component: Responses API load balancing (encrypted_content_affinity pre-call check) Operation: Multi-turn Responses API calls (reasoning items with encrypted_content, e.g. Codex) routed across multiple Azure regions / OpenAI orgs Affected versions: LiteLLM router before encrypted_content_affinity (Feb 2026); later versions unless the check is enabled Environment: LiteLLM with multiple deployments of the same model using different API keys/orgs HTTP status: 400 Exception: litellm.BadRequestError Packages: litellm before Feb 24, 2026 fix; fix requires opting in Trigger: Load balancer sends a follow-up to a deployment whose API key belongs to a different organization than the one that created the encrypted items.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- could not be verified. Reason: Encrypted content organization_id did not match the target organization.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [LiteLLM Router + OpenAI/Azure Responses API] Follow-up turns fail 'The encrypted content for item rs_... could not be verified. Reason: Encrypted content organization_id did not match t
Recommended action: Upgrade and enable router_settings.enable_pre_call_checks: true with optional_pre_call_checks: [encrypted_content_affinity] (LiteLLM encodes originating model_id in item ids/encrypted_content and pins follow-ups only when needed).
Fix: Enable encrypted_content_affinity [evidence: official_recommended_action]
Applies when: LiteLLM routers with multi-key Responses deployments
Steps:
1. router_settings: enable_pre_call_checks: true
2. optional_pre_call_checks: [encrypted_content_affinity]
3. Optionally deployment_affinity_ttl_seconds: 86400
Expected: Follow-ups with encrypted items routed to the originating deployment
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 9b293fb1-c32b-4994-81e5-046741530dff
- Proposed action
- Recommended action: Upgrade and enable router_settings.enable_pre_call_checks: true with optional_pre_call_checks: [encrypted_content_affinity] (LiteLLM encodes originating model_id in item ids/encrypted_content and pins follow-ups only when needed). Fix: Enable encrypted_content_affinity [evidence: official_recommended_action] Applies when: LiteLLM routers with multi-key Responses deployments Steps: 1. router_settings: enable_pre_call_checks: true 2. optional_pre_call_checks: [encrypted_content_affinity] 3. Optionally deployment_affinity_ttl_seconds: 86400 Expected: Follow-ups with encrypted items routed to the originating deployment
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.