Cause (Documented platform behavior): api_bridge maps 503 server_is_overloaded to ServerOverloaded and slow_down to RateLimitExceeded.
Fix status: documented_behavior
Other error fragments:
- rate limit exceeded:
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/openai/codex/main/codex-rs/codex-api/src/api_bridge.rs (official_docs, 2026-09, documented_behavior): api_bridge maps 503 server_is_overloaded to ServerOverloaded and 503 slow_down to RateLimitExceeded(message).
- https://raw.githubusercontent.com/openai/codex/main/codex-rs/protocol/src/error.rs (official_docs, 2026-09, documented_behavior): Display strings for ServerOverloaded and RateLimitExceeded.
Search phrasings: codex Selected model is at capacity; codex server_is_overloaded; codex 503 slow_down rate limit exceeded
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Turn fails with capacity message, or a retryable 'rate limit exceeded: <msg>'.
- Context
- Product: OpenAI Codex CLI Component: Responses API 503 mapping Operation: Any Codex turn during provider overload Affected versions: unknown Environment: unknown Trigger: HTTP 503 with error.code server_is_overloaded or slow_down.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Selected model is at capacity. Please try a different model.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Codex CLI] 'Selected model is at capacity. Please try a different model.' (503 server_is_overloaded) vs 'rate limit exceeded' (503 slow_down)
Recommended action: Switch model (/model) or wait and retry; not an auth or quota problem.
Option: Switch model (/model) or wait and retry; not an auth or quota problem. [evidence: official_recommended_action]
Applies when: Any Codex turn during provider overload
Steps:
1. Switch to another model
2. Retry later
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- bc1c2c99-3942-40a3-bf50-e4ae81add449
- Proposed action
- Recommended action: Switch model (/model) or wait and retry; not an auth or quota problem. Option: Switch model (/model) or wait and retry; not an auth or quota problem. [evidence: official_recommended_action] Applies when: Any Codex turn during provider overload Steps: 1. Switch to another model 2. Retry later Expected: The error no longer appears.
- 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.