Claude API Priority Tier SLA
Anthropic · AI models · promises up to 99.5% · checked 23h ago
18 major outages in the last 365 days: 4.4 d counted, 98.8% observed against the 99.5% Priority Tier (existing commitments only).
4 of 12 months fell below it (credits are claimed per month).
Last 90 days: 4.1 h counted, 99.809% observed.
Incidents, last 365 days
StartedIncidentCounted asDuration
- Elevated errors for multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 22, 2026 · 98 min
- Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 15, 2026 · 86 min
- Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 11, 2026 · 17 min
- Elevated latency on the Claude API for some usersClaude API (api.anthropic.com), Claude CoworkMinorSep 10, 2026 · 1.7 h
- Elevated errors for multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 3, 2026 · 3 h
- Elevated errors for Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 3, 2026 · 19 min
- Elevated errors for Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedSep 2, 2026 · 26 min
- Elevated errors for multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedAug 24, 2026 · 3.4 h
- Elevated errors on requests to multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedAug 20, 2026 · 26 min
- Elevated errors on Google connectorsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 20, 2026 · 29 min
- Degraded performance for Claude Opus 5 and Claude Haiku 4.5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 19, 2026 · 80 min
- Degraded performance for multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 18, 2026 · 2.7 h
- Degraded performance for Claude Opus 5, Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 17, 2026 · 93 min
- Service disruption on Claude servicesclaude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com), Claude Code, Claude CoworkOutageAug 16, 2026 · 36 min
- Service disruption on Claude servicesClaude API (api.anthropic.com), Claude Code, Claude CoworkDegradedAug 14, 2026 · 88 min
- Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkDegradedAug 13, 2026 · 95 min
- Degraded performance for multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 12, 2026 · 4.3 h
- Degraded performance for Claude Opus 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 5, 2026 · 43 min
- Degraded performance of multiple modelsclaude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 5, 2026 · 7.2 h
- Elevated errors on Claude Sonnet 5claude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com), Claude CodeMinorAug 4, 2026 · 25 min
- Elevated errors on Claude Sonnet 5claude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com), Claude CodeMinorAug 4, 2026 · 39 min
- Degraded performance on Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 3, 2026 · 15 min
- Error rates across multiple modelsclaude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorAug 3, 2026 · 84 min
- Degraded performance on Claude Sonnet 5claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorJul 31, 2026 · 47 min
- Degraded performance on Claude Opus 4.8claude.ai, Claude API (api.anthropic.com), Claude Code, Claude CoworkMinorJul 30, 2026 · 41 min
Latest 25 of 60.
Major outage time per month
Allowed per month: 3.6 h
Commitments and credits
TierUptimeCredit of the monthly bill
- Priority Tier (existing commitments only)Organizations with an existing Priority Tier capacity commitment (input TPM + output TPM, 1/3/6/12 months, specific model). No longer sold.99.5%No credit schedule published
SLA changes
DateServiceChangeSource
- Sep 23, 2026Claude API Priority TierPriority Tier moved from a purchasable offer ('Get started with Priority Tier ... Higher availability: Target 99.5% uptime', still present in the 2025-11-11 snapshot) to 'no longer available for purchase' for new commitments. The 99.5% target is unchanged. Exact change date unknown; after 2025-11-11, observed 2026-09-23.Source
More in ai models
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Amazon BedrockAWS · AI models · Standard99.9%First credit10%Observed 365d99.178%All incidents 99.852%
Claude API (Standard tier)Anthropic · AI modelsNoneFirst creditn/aObserved 365d98.76%All incidents 94.774%
Cohere API (SaaS: Command, Embed, Rerank)Cohere · AI modelsNoneFirst creditn/aObserved 365d100%All incidents 99.986%
Vertex AI (Gemini API on Vertex)Google Cloud · AI models · Vertex AI Platform: Training, Deployment, Batch Prediction99.9%First credit10%Observed 365d100%All incidents 99.488%
Hugging Face Inference EndpointsHugging Face · AI modelsNoneFirst creditn/aObserved 365dNo feed
Azure OpenAI in Foundry ModelsMicrosoft Azure · AI models · Foundry Models (Sold by Azure), availability99.9%First credit10%Observed 365dNo feedAll incidents 100%
Terms, exclusions and sources
- Measured
- Stated as a target, not a contractual SLA; measurement window not published.
- Not covered
- Target only; no service-credit schedule published; Requests beyond committed capacity fall back to standard tier; Not supported on Claude Fable 5.1, Mythos 5.1/5/Preview, Opus 5.5, Opus 5, Sonnet 5; Requests exceeding regular rate limits are declined
- Status history
- Status history since Sep 22, 2025
- Weighted uptime
- All incidents, weighted: 94.774% · Downtime
Priority Tier targets 99.5% uptime with prioritized computational resources. Requests beyond your committed capacity automatically fall back to standard tier.
Page banner (fetched 2026-09-23): 'Priority Tier capacity commitments are no longer available for purchase. Organizations with an existing commitment can continue to use Priority Tier through their contract end date'. For guaranteed capacity it points to contact sales. The 99.5% figure is worded as a target, not an SLA with credits.
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